Publications

PAPERS PUBLISHED IN JOURNALS

1. Maiti, S., Kumar, C. R., Sarkar, P., Tiwari, R. K., & Srinu, U. (2019). Interface depth modelling of gravity data and altitude variations: a Bayesian neural network approach. Neural Computing and Applications, 1-20.
2. Padmavathi, B., Rekapalli, R., & Tiwari, R. K. (2019).Role of Natural and Anthropogenic Loadings on Indian Temperature Trends. Pure and Applied Geophysics, 1-16.
3. Rajesh, R., Kumar, K. S., & Tiwari, R. K. (2019). Regional and Residual Gravity Anomaly Separation Using Singular Spectrum based Frequency Filtering Methods: A Case Study of Shallow Subsurface Modeling from Nagpur, India. Pure and Applied Geophysics, 1-14.
4. Malkoti, A., Vedanti, N., & Tiwari, R. K. (2019). A highly efficient implicit finite difference scheme for acoustic wave propagation. Journal of Applied Geophysics, 161, 204-215.
5. Kumar, K. S., Begum, S. P., Srinivas, G. S., Rao, M. S. H., Prasad, P. P., Seshunarayna, T., & Tiwari, R. K. (2018). Spectral Analysis of Magnetic data in the Ajmer-Sambar Sector, North-Central Rajasthan. Journal of the Geological Society of India, 92(3), 368-372.
6. Malkoti,A., Vedanti, N., Tiwari, R.K. (2018). An algorithm for fast elastic wave simulation using a vectorized finite difference operator, Computers & Geosciences 116, 23-31
7. R.Rajesh and R.K.Tiwari. (2018). Search for the trends and periodicities in inter- hemispheric sea surface temperature difference, Pure and Applied Geophysics, 1-14.
8. Tiwari, R. K., Rajesh, R., Dhanam, K., & Seshunarayana, T. (2018). 2D Seismic reflection data filtering using Time Slice Singular Spectrum Analysis for noise suppression: A case study from Singareni coalfield, India. J. Ind. Geophys. Union (September 2018), 22(5), 459-467.
9. Kumar, K. S., Begum, S. P., Srinivas, G. S., Rao, M. S. H., Prasad, P. P., Seshunarayna, T., & Tiwari, R. K. (2018). Spectral Analysis of Magnetic data in the Ajmer-Sambar Sector, North-Central Rajasthan. Journal of the Geological Society of India, 92(3), 368-372.
10. Rajesh, R., & Tiwari, R. K. (2018). 2D Seismic Data Filtering using Singular Spectrum Based Algorithms. Jour. of Geophysics, 39(3).
11. R.Rajesh and R.K.Tiwari (2018). FORTRAN code to convert resistivity Vertical Electrical Sounding data to RES2DINV format, Journal of Indian Geophysical Union, v.22, no.3, pp: 359-363
12. K. Satish Kumar, R. Rajesh and R.K.Tiwari. (2017). Regional gravity anomaly separation using Singular Spectrum Analysis: A case study from Nagpur, Maharashtra, India. Exploration Geophysics (CSIRO). https://doi.org/10.1071/EG16115
13. Kattamanchi, S., Tiwari, R.K., Ramesh, D.S. (2017). Non-stationary ETAS to model earthquake occurrences affected by episodic aseismic transients, Earth, Planets and Space 69 (1), 157
14. Singh, A., Maiti, S., Tiwari, R.K. (2017). Selection of optimum wavelet in CWT analysis of geophysical downhole data, J. Ind. Geophys. Union (March 2017) 21 (2), 153-166
15. Rajesh, R., R. K. Tiwari, Mrinal K. Sen, and Nimisha Vedanti.(2017). 3D seismic data de-noising and reconstruction using Multichannel Time Slice Singular Spectrum Analysis. Journal of Applied Geophysics 140 (2017), 145-153.
16. Rajesh Rekapalli and R.K.Tiwari. (2016). Frequency filtering using Singular Spectrum Analysis involving Eigen weighted spectrogram. Journal of Applied Geophysics, 132 (2016): 33-37
17. Singh, A., Maiti, S., Tiwari, R.K. (2016). Modelling discontinuous well log signal to identify litho logical boundaries via wavelet analysis: An example from KTB borehole data, Journal of Earth System Science 125 (4), 761-776
18. Maury, S., Tiwari, R.K., Balaji, S. (2016), Joint application of satellite remote sensing, ground penetrating radar (GPR) and resistivity techniques for targeting ground water in fractured Ophiolites of South Andaman, Environmental Earth Sciences 75 (3), 237
19. R.K.Tiwari, R. Rajesh and B.Padmavathi (2016). Evidence of Higher-Order Solar Periodicities in China Temperature Record. Pure and Applied Geophysics: 1-10.
20. Rajesh, R.,& Tiwari, R.K. (2015). Singular Spectrum Based Algorithms Forde-noising 2D and 3D Seismic Data. Journal of Geophysics, Issue 3, P.129-137.
21. Rekapalli Rajesh., & Tiwari, R. K. (2015). A short note on the application of Singular Spectrum Analysis for Geophysical Data processing. J. Ind. Geophys. Union , 19(1), 77-85.
22. Lakshmi, S., Tiwari, R.K. (2015). Wavelet analysis of the singular spectral reconstructed time series to study the imprints of Solar-ENSO-Geomagnetic activity on Indian climate, Atmospheric Chemistry & Physics 15 (18).
23. Tiwari, R.K., Krishnaveni, P. (2015). Evidence of self-organization in Sumatra earthquakes: recurrence time and its geodynamical implications, Natural Hazards 77 (1), 51-63
24. R.K.Tiwari and Rajesh. R., (2014). Factorized Hankel Optimal Singular Spectral approach for erratic and noisy Seismic signal denoising. Journal of Applied Geophysics, 111, 95-101
25. Tiwari, R.K., R. Rajesh, and B. Padmavathi(2014). Evidence for Nonlinear Coupling of Solar and ENSO Signals in Indian Temperatures During the Past Century, Pure Appl. Geophys, DOI: 10.1007/s00024-014-0929-1.
26. Rajesh Rekapalli, R.K.Tiwari, M.J.Nandan and T.Balaji(2014), Groundwater management Mandollagudem TECHVIL cluster, Nalgonda district, Andhra Pradesh - though Scientific cultivation, Journal of Indian Geophysical Union, v.18, no.4, pp:434-439.
27. Tiwari, R. K., and R. Rajesh (2014)Imprint of long-term solar signal in groundwater recharge fluctuation rates from Northwest China, Geophys. Res. Lett., 41, doi:10.1002/2014GL060204.
28. Tiwari,R.K., Chamoli,A. (2014) Is tidal forcing critical to trigger Sumatra earthquakes, Natural Hazard, 1-10, doi: 10.1007/s11069-014-1068-9.
29. Rajesh R., R.K.Tiwari, K.Dhanam and T.Seshunarayana (2014) T-x frequency filtering of High Resolution Seismic Reflection data using Singular Spectral Analysis. Journal of Applied Geophysics, 105, 180-184.
30. SaumenMaiti and R.K. Tiwari (2014). A comparative study of artificial neural networks, Bayesian neural networks and adaptive neuro-fuzzy inference system in groundwater level prediction, Environmental Earth Sciences, 71(7), 3147-3160.
31. Tiwari, R. K., Rajesh, R., Seshunarayana, T., and Dhanam, K. (2014) Complex noise suppression and reconstruction of seismic reflection data from fault structures using Space Lagged Singular Spectral Analysis, Nonlin. Processes Geophys. Discuss., 1, 649-663, doi:10.5194/npgd-1-649-2014, 2014.
32. Rajesh, R. and Tiwari, R. K. (2014) Brief Communication: Correlation of global earthquake rates with temperature and sunspot cycle, Nat. Hazards Earth Syst. Sci. Discuss., 2, 2851-2867, doi:10.5194/nhessd-2-2851-2014.
33. Upendra K. Singh, R.K. Tiwari and S.B. Singh (2013) Neural network modeling and prediction of resistivity structures using VES Schlumberger data over a geothermal area. Computers & Geosciences 52: pp. 246-257. DOI 10.1016/j.cageo.2012.09.018. IF 1.34
34. SaumenMaiti, Gautam Gupta, Vinit C Erram and Ram Krishna Tiwari (2012) Delineation of shallow resistivity structure around Malvan, Konkan region, Maharashtra by neural network inversion using vertical electrical sounding measurements. Environ Earth Sci, DOI 10.1007/s12665-012-1779-8. IF 1.059
35. R.K. Tiwari, R.R Yadav and K.P.C.Kaladhar Rao(2012)Empirical orthogonal functionSpectra of Extreme Temperature Variability decoded from Tree Rings of Western Himalayas. American Geophysical Monograph Series , 10.29/2011(GM001133).
36. R.K. Tiwari and S. Maiti(2011) Bayesian Neural Network Modeling of Tree- Ring Temperature Variability Record from the Western Himalayas, Non Linear Processes in Geophysics (AGU), Vol.18, pp.515-528, Doi.10. 5194/NPG-18-515-2011.IF 1.597
37. SaumenMaiti,V.C. Erram, Gautam Gupta, Ram Krishna Tiwari, U.D. Kulkarni, R.R. Sangpal(2012) Assessment of groundwater quality: a fusion of geochemical and geophysical information via Bayesian neural networks. Environment Monitoring and Assessment, Vol.185, issue 4, pp.3445-3465.
38. SaumenMaiti, Gautam Gupta, Vinit C Erram and R.K. Tiwari (2011) Inversion of Schlumberger Resistivity Sounding Data from the critically Dynamic Koyna Region using the Hybrid Monte Carlo-Based Neural Network Approach, Non Linear Processes in Geophysics (AGU), 18, 1-14. IF 1.597
39. SaumenMaiti and R.K. Tiwari(2010). Neural network modeling and an uncertainty analysis in Bayesian framework: A case study from the KTB borehole site. Jour Geophy Research, Vol 115, B10208. ,1-28, doi:10.1029/2010JB000864. IF 3.021
40. SaumenMaiti and Ram Krishna Tiwari, (2010).Automatic discriminations among geophysical signals via the Bayesian neural networks approach. Geophysics,Vol. 75, pp(E67-78) . IF 1.418
41. U.K. Singh, R.K. Tiwari and S.B. Singh, (2010). Inversion of 2-Dimensional DC Resistivity Data using Rapid Optimization and Minimal Complexity Neural Network. Non-linear Processes in Geophysics. (AGU) Vol.17, pp.1-12.IF 1.597
42. R.K.Tiwariand S.Srilakshmi, (2009). Periodicities and Non-stationary modes in tree rings temperature variability record of the western Himalayas by multi- taper and wavelet spectral analyses. Current Science, Vol.97, No.5, pp.705-709.IF 0.935
43. SaumenMaiti and R.K.Tiwari.,(2009). A Hybrid Monte -Carlo Method based Artificial Neural networks Approach for rock boundaries identification: A case study from the KTB bore hole. Pageoph, Vol.166, pp 2059-2090. IF 1.787
44. K.P.C. Kaladhar Rao and R.K. Tiwari,(2009). Principal Component and Spectra analyses of Palaeo-climate time series. Current Science, Vol. 96, No.9. pp 1229-1232. IF 0.935
45. S. Sri Lakshmi and R.K. Tiwari(2009) Model dissection from earthquake time series: A Comparative analysis using modern non-linear forecasting and artificial neural network approaches. Computers & Geosciences, Vol, 35, pp.191-204.IF 1.348
46. R.K. Tiwari,(2008). Periodicity of Geological Events and Past Climate Change. Memoir No. 68, pp 63-88, published by Geological Society of India. IF 0.596
47. SaumenMaiti, R.K.Tiwariand Hans-Joachim Kuempel(2007). Neural network modeling and classification of lithofacies using well log data. A case study from KTB bore hole site. Geophysical Journal International Vol, 169, No. 2 pp133-146. IF 2.42
48. S.Srilakshmi and R.K.Tiwari (2007) Are Northeast and Western Himalayas Earthquake Dynamics Better “Organized” than Central Himalayas: An Artificial Neural Network Approach. GeifisicaInternational , Vol 46, No 1 pp 63-73.
49. S Srilakshmi and R. K Tiwari (2007). Assessing the impact of foreshocks and aftershocks on the earthquake dynamics in North East India using the non-linear forecasting techniques. Jour Geol. Soc India Vol 69. Pp746-754. IF 0.596
50. U.K.Singh, Tiwari, R.K., and S.B.Singh (2006). Prediction of Electrical Resistivity structures using Artificial Neural Networks, Jour. Geol. Soc. India. V67, pp 234–242. IF 0.596
51. Tiwari, R.K, and Srilakshmi. S. (2005). Some common and contrasting features of earthquake dynamics in the major tectonic units of Himalayas using the non-linear forecasting approach, Current Science, Vol. 88, No. 4, pp. 640-647. IF 0.935
52. Maiti, S., and Tiwari, R.K., (2005). Automatic Detection of Litholog Boundaries using the Walsh Transform: A Case Study from KTB Borehole. Computers and Geosciences Vol:31 (2005) 949-955. IF 1.348
53. U.K.Singh, Tiwari, R.K., and Singh, S.B., (2005). One-dimensional inversion of geoelectrical resistivity sounding data using Artificial Neural Networks-a case study, Computers & Geosciences, Vol.31, pp. 99-108. IF 1.348
54. Tiwari, R.K., Leonardi. S., and Kuempel, H. J. (2005). Seasonality bias of reservoir-induced seismic activity in Koyna, India: IN Rock mechanics with emphasis on stress, Editor Fritz Rummel, Oxford and IBH Pub. Comp New Delhi. PP 119-133. 2005.
55. Tiwari, R.K. and Rao, K.N.N. (2004). Signature of global ENSO dynamics in the Arabian Sea coral growth rate (Feviaspeciosa) record and Indian monsoon. Pageoph, Vol. 161, No. 2, 413-427. IF 1.787
56. Maiti, S. and Tiwari, R.K., (2004). Interpretation of Gravity Anomaly Over Symmetric Sedimentary Basin using the Walsh Transform. In the proceedings of SPG, pp. 975-979.
57. Tiwari, R.K., S. Srilakshmi and Rao, K.N.N (2004). Characterization of earthquake dynamics in Northeastern India regions: A modern nonlinear forecasting approach. Pageoph, Vol. 161, No. 4, pp. 865-880. IF 1.787
58. Tiwari, R.K., and Srilakshmi. S. (2003). Strategy for Dissection of Mathematical Model: Application to some Non-linear Geophysical problems. CSIR Diamond Jubilee Celebrations, In “Frontiers of Geophysical Research”, at NGRI, Hyderabad. Pp 51-55
59. Tiwari, R.K., Srilakshmi. S and Rao, K.N.N (2003). Nature of earthquake dynamics in Central Himalayan regions: A non-linear forecasting approach, Journal of Geodynamics, 35, 273-287. IF 2.007
60. Tiwari, R.K. and Rao, K.N.N (2003). A statistically significant long-term time scale in Calcareous Trochospiral Benthic Foraminifera during the past 120 m.y., Geophysical Research Letters, Vol. 30, No. 5, 1217-1220. IF 3.792
61. Tiwari, R.K. and Rao, K.N.N (2003). Mega-Geocycles: Echoes of Astronomical events. Jour. Geol. Soc. India, Vol. 62, 181-190. IF 0.596
62. Srilakshmi.S.,Tiwari, R.K., and Somvanshi, V.K. (2003). Prediction of Indian Rainfall Index (IRF) using the ENSO variability and Sunspot cycles- An Artificial Neural Network Approach, Jour. Of Indian Geophysical Union, Vol.7, No. 4, pp. 173-181. IF 0.388
63. Tiwari, R.K., Somvanshi V.K, Singh U.K. andSrilakshmi. S (2002). Modeling and prediction of precipitation pattern over the Indian continent using neural network. International Groundwater Conference on “Sustainable Development and Management of Groundwater Resources in Semi-Arid Region with Special Reference to Hard Rocks”, 477-483.
64. Tiwari, R.K., U.K. Singh, Somvanshi V.K and S.B. Singh (2002). Artificial neural network inversion of DC resistivity data. International Groundwater Conference on “Sustainable Development and Management of Groundwater Resources in Semi-Arid Region with Special Reference to Hard Rocks”, pp57-64.
65. Tiwari, R.K. and Rao, K.N.N. (2001). Power law variation random behavior and seasonality bias of Northeastern Indian earthquakes. Jour. Geol. Soc. India, 57, 369-376.IF 0.596
66. Tiwari, R.K. and Rao, K.N.N. (2000). Solar and tidal reverberations of deglaciation records from the Tropical Western Pacific: A clean spectral approach, Geofizika, 16, 33-41. IF 0.798
67. Tiwari, R.K. (2000). Detecting chaos from geophysical time series. In: Applications of Fractals in Earth Sciences (Editor: V.P. Dimri), Oxford and IBH Pub. Co. Pvt. Ltd., New Delhi, 195-213.
68. Tiwari, R.K. (2000). Application of catastrophe theory to some non-linear geophysical problems. In: Applications of Fractals in Earth Sciences (Editor: V.P. Dimri), Oxford and IBH Pub. Co. Pvt. Ltd., New Delhi, 195-213.
69. Tiwari, R.K. and Rao, K.N.N. (1999). Phase space structure, attractor dimensions, Lyapunov exponent and nonlinear prediction from earth’s atmospheric angular momentum time series, Pageoph, 156(4), 919-937. IF 1.787
70. Tiwari, R.K. and Rao, K.N.N. (1999). Periodicity in marine phosphorus burial rate, Nature, 400, 31-32. IF 36.28
71. Tiwari, R.K. and Rao, K.N.N. (1998). Possible impact of tidal frequencies on the predictability of the earth’s axial rotation. Current Science, 74, 606-610. IF 0.935
72. Tiwari, R.K. and Rao, K.N.N. (1998). Correlated variations and periodicity of global CO2, biological mass extinctions and extra-terrestrial bolides impacts over the past 250 million years and possible geodynamical implications, Geofizika, 15, 103-117. IF0.798
73. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1997). Detection of long term modulation orbital cycles in the sea level oscillations using clean algorithm of spectral analysis. Geofizika, 14,133-147. IF0.798
74. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1997). Nature of chaos and limits of predictability of length of the day (LOD) fluctuations, Journal of Geophysics, (2), 153-158. IF 1.418
75. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1996). Clean periodicity in secular variations of dolomite abundance in deep marine sediments, Marine Geology, 133, 113-121. IF 2.266
76. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1995). Detecting chaos and limits of predictability from dynamical system: An application to climate and LOD time series. 32^nd Annual Convention and seminar on “Marine Geophysics”, Indian Geophysical Union, Pp, 59-60. IF 0.388
77. Tiwari, R.K., (with Negi, J.G. and Rao, K.N.N.) (1994). Strange attractor in non-linear fluctuations of Length of the Day (LOD) time series. Non-linear dynamics and predictability of geophysical phenomena. American Geophysical Union Monograph, 18, 61-67.
78. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1993). Comparison of Walsh and Fourier spectroscopy of geomagnetic reversals and palaeo-climate time series, IEEE Trans. Geosciences and Remote Sensing, 127-135. IF 0.642
79. Tiwari, R.K. et al (1993). Some non-linear geophysical problems: Application of Fractal, chaos and catastrophe theory, Proc. 29^th Annual Convention on “Perspectives and Prospects in Geosciences towards the New Industrial Policy”, Indian Geophysical Union, 58-68. IF 0.388
80. Tiwari, R.K. et al (1993). A mathematical catastrophe model of pale climatic sea-ice-ocean-temperature (SIOT) oscillator, Proc. Annual Convention on “Space Applications in the Earth Sciences”, Indian Geophysical Union, 107-113. IF 0.388
81. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1992). Strange attractor in the non-linear variations of length of day (LOD) time, Geophys. Res. Lett., 19, 909-913. IF 3.792
82. Tiwari, R.K. (with Negi, J.G.) (1990). Walsh spectral resolution of earth’s rotation and atmospheric circulation, Geofizika, 7, 83-89. IF 0.798
83. Tiwari, R.K. (with Negi, J.G). (1990). Periodicities in natural remnant and magnetization and pale climatic records detected by Walsh spectra, Pageoph, 132, 575-769. IF 1.787
84. Tiwari, R.K. (with Negi, J.G and Rao, K.N.N.) (1990). Clean spectral analysis of long-term sea level changes, Terranova, 138-141. IF 2.339
85. Tiwari, R.K. (with Negi, J.G.) (1988). Climate and sea level variations cycles during the last 8000 years and their relationship with global human history. Proc. First Indian Conference on Marine Archaeology of Indian Ocean Countries, 79-82.
86. Tiwari, R.K. (1987). Higher order eccentricity cycles of the middle and late Miocene climatic variations. Nature, 327, 219-221. IF 36.28
87. Tiwari, R.K. (1987). A Walsh spectral comparison of Oxygen (d10) and Carbon (d13 C variations of the Pleistocene borehole (Eureka 67-135) from the Gulf of Mexico and their orbital significance, Marine Geology, 78, 174-176. IF 1.787
88. Tiwari, R.K. (with Negi, J.G.) (1984). Periodicities of pale magnetic and pale climatic variations: A Walsh spectral approach, Earth & Planet. Sci. Lett., 7, 137-147. IF 4.18
89. Tiwari, R.K. (with Negi, J.G.) (1983). Matching long term periodicities of geomagnetic reversals and galactic motions of the solar system, Geophys Res. Lett., 10, 713-716. IF 3.79
90. Tiwari, R.K. (with Mishra, D.C. and Naidu, P.S.) (1983). Recent developments in the interpretation of potential field and their application over data from some critical areas in this country, Cuddapah Basin and Central India, G.S.I. Memoir 2, 349-367.
91. Tiwari, R.K. (with Mishra, D.C.) (1981). Spectral study of Bouguer anomaly map of rift valley and adjacent area in Central India, Pageoph 119, 1051-1062. IF 1.787

POPULAR REPORTS ON RESEARCH WORKS:

1. New Scientist (Monitor Section): 26th January 1984 under the title “when north was south”, page 25.
2. Scientific American (March 1984): Section: “Science and Citizen” under the title, “flipping fields”, page 70.
3. New Scientist (February 1985 issue): Section: “Science” under the title, “New statistics tie climate theories together”, page 20.
4. Science Today (February 1984 issue): Section: “Round of research” under the title “Geomagnetic reversals and galactic motions of the solar system”, page 32.
5. India Today (February 28, 1985 issue): Section: “Science” under the title, “The Mysterious Force”.
6. Illustrated Weekly (February 14‑20, 1988 issue): “Waves of History”.
7. Limca Book of records of 1992: Periodicity of geomagnetic reversals under the title “Invention”, pp.8.
8. VigyanAnveshanSandesh Nov 1991, CSIR Golden Jubilee Year.

CONFERENCE ABSTRACTS AND PAPERS:

1. Tiwari, R.K. and Mishra, D.C. (1979). Spectral study of Bouguer anomaly map of rift valley (South Rewah Mahanadi Vindhyan Basin). Paper presented at EAEG Meeting, Hamburg (29^th May – 1^st June), F.R.G., Geophysical Prospecting, and 27, 671
2. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1987). Galactic forcing of long term sea level fluctuations. Presented at IUGG Meeting held at Vancouver, Canada, August.
3. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1988). Long and short term global cycles of sea level fluctuations and their external and internal forcing. Presented at International Symposium on “Structure and Dynamics of the Indian Lithosphere”, N.G.R.I., Hyderabad, February 3.
4. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1991). Low dimensional strange attractor in chaotic component of length of the day time series, IUGG Symposium, Vienna, Austria, August 20-21.
5. Tiwari, R.K. (1991). Strange attractor in non-linear fluctuations of LOD variations, Paper presented at School of Mathematics and Computer/Information Science, Hyderabad University, February 20-23.
6. Tiwari, R.K. (with Negi, J.G. and Rao, K.N.N.) (1995). Stability of forced non- linear sea-ice-ocean temperature (SIOT) oscillator using the catastrophe theory. Presented at International Conference on “Differential Equations: Theory, Method and Applications”, B.M. Birla Science Center, Hyderabad, February 20-23.
7. Tiwari, R.K. (with Singh, A.P.) (1998). Fractal dimension of spatial disposition of the lineaments in South India, 35^th Annual Convention and Meeting on “Continental Margins of India – Evolution of Processes and Potentials”, Indian Geophysical Union, National Institute of Oceanography, Goa, November 18-20.
8. Tiwari, R.K. and Rao, K.N.N. (1998). Application of mathematical catastrophe theory to study the triggering and nucleation of earthquake slip, 35^th Annual Convention and Meeting on “Continental Margins of India – Evolution of Processes and Potentials”, Indian Geophysical Union, National Institute of Oceanography, Goa, November 18-20.
9. Tiwari, R.K. (with Srilakshmi. S and Rao, K.N.N.) (2001). Nature of earthquake dynamics in the Central Himalayan Regions: A nonlinear forecasting analysis. 38^th Annual Convention and Meeting on “Natural Hazards and Disaster Management-Role of Earth System Scientists”, Indian Geophysical Union, National Institute of Oceanography Regional Center & Department of Geophysics, Andhra University, Visakhapatnam, December 18-20.
10. Tiwari, R.K. (with Srilakshmi. S and Somvanshi V.K.) (2001). Signal detection and identification using artificial neural network. 38^th Annual Convention and Meeting on “Natural Hazards and Disaster Management-Role of Earth System Scientists”, Indian Geophysical Union, National Institute of Oceanography Regional Center & Department of Geophysics, Andhra University, Visakhapatnam, December 18-20.
11. Tiwari, R.K. (with Srilakshmi. S and Rao, K.N.N.) (2001).On the possible predictability of Indian monsoon by nonlinear forecasting analysis. 38^th Annual Convention and Meeting on “Natural Hazards and Disaster Management-Role of Earth System Scientists”, Indian Geophysical Union, National Institute of Oceanography Regional Center & Department of Geophysics, Andhra University, Visakhapatnam, December 18-20.
12. Tiwari, R.K. (with Srilakshmi. S and Somvanshi V.K.) (2002). ANN based prediction of Indian Rainfall Index (IRF) using the ENSO variability and Sunspot cycles. 39^th Annual Convention and Meeting on “Sustainability Science and Environmental Geophysics”, Indian Geophysical Union, NEERI, Nagpur, October 4-6.
13. Tiwari, R.K. (with Srilakshmi. S and Somvanshi V.K.) (2002). Porosity modeling and prediction of artificial neural network for KTB borehole data. 39^th Annual Convention and Meeting on “Sustainability Science and Environmental Geophysics”, Indian Geophysical Union, NEERI, Nagpur, October 4-6.
14. Tiwari, R.K. (with Somvanshi V.K., Singh S. B and Singh U. K.) (2002). Neural Networks learning using BPA and application to resistivity modeling. 39^th Annual Convention and Meeting on “Sustainability Science and Environmental Geophysics”, Indian Geophysical Union, NEERI, Nagpur, October 4-6.
15. Tiwari, R.K. (with Somvanshi V.K., Singh S. B and Singh U. K.) (2002). Forward modeling and inversion of DC resistivity data using artificial neural networks. 39^th Annual Convention and Meeting on “Sustainability Science and Environmental Geophysics”, Indian Geophysical Union, NEERI, Nagpur, October 4-6.
16. Tiwari, R.K., and Srilakshmi. S. (2003). Some common and contrasting features of the Northeast India and Himalayan earthquakes: Wavelet spectra, Recurrence time scaling, nonlinear modeling and prediction. XXIII General Assembly of the International Union of Geodesy and Geophysics (IUGG), June 30- July 11, 2003 at Sapporo, Japan.
17. Tiwari, R.K., and Srilakshmi. S. (2003). Strategy for Dissection of Mathematical Model: Application to some Non-linear Geophysical problems. CSIR Diamond Jubilee Celebrations, Seminar on “Frontiers of Geophysical Research”, September 10-11, 2003 at NGRI, Hyderabad.
18. Maiti, S. and Tiwari, R.K., (2003). An Automatic Method for Detecting and Analyzing Geophysical Signal Using Walsh Transform. 40^th Annual Convention and Meeting on “Sustainability Science and Environmental Geophysics”, Indian Geophysical Union, University of Madras, Chennai, December 16-18.
19. Maiti, S. and Tiwari, R.K., (2004).Interpretation of Gravity Anomaly Over Symmetric Sedimentary Basin using the Walsh Transform, 5^th Conference and Exposition on Petroleum Geophysics on “Geophysics: Leveraging Technologies for E&P Business”, Hyderabad, January 15-17.
20. Srilakshmi. S and Tiwari, R.K. (2004). The possible impact of foreshocks and aftershocks on the earthquake dynamics in Northeast India: A Non-linear forecasting approach. Joint AOGS 1^st Annual meeting & APHW 2^nd Conference, Singapore, July 5-9, 2004.
21. Tiwari, R.K., and Srilakshmi. S. (2004). Assessing the impacts of ENSO and NAO on Indian monsoon using the multiple spectral and Non-linear forecasting techniques. Joint AOGS 1^st Annual meeting & APHW 2^nd Conference, Singapore, July 5-9, 2004.
22. Tiwari, R.K. (2005). Signature of ENSO and NAO signals in the Indian subcontinent monsoon system, AOGS 2^nd Annual meeting, Singapore, June 20-24, 2005.
23. Tiwari, R.K., and Srilakshmi. S. (2005). Earthquake dynamics in major tectonic zones of Himalayas using non-linear forecasting approach. AOGS 2^nd Annual meeting, Singapore, June 20-24, 2005
24. R.K.Tiwari and S.Srilakshmi (2005). Decadal to Interdecadal time scale climate variability: in context of Asian/Indian monsoon system. Proceedings of International Roundtable on “Understanding and Prediction of summer and winter monsoon”, Indonesia, 21-24 Nov (2005)
25. Maiti, S., and Tiwari, R.K.,. (2005). Identifying Litho-facies Boundaries using Super Self Adaptive Back Propagation Neural network (SSAB): A Case Study from the KTB Borehole, Petrotech, Delhi, Extended Abstract
26. Tiwari, R.K. (2009) Random Fractals, Deterministic Chaos and Non-linear Prediction: Some examples from Geophysics. Invited Lecture given in the National Seminar on Challenges in Geophysics in 21^st Century, conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during Feb. 27 to March 1^st 2009.
27. R.K. Tiwari and M. Tirupathi (2009) Modeling rainfall data using artificial neural networks. Paper presented in the National Seminar on Challenges in Geophysics in 21^st Century, conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during Feb. 27 to March 1^st 2009.
28. R.K. Tiwari and K.P.C. Kaladhara Rao (2009) The Wavelet Spectral analysis of non-stationary Sea Surface Temperature variability from the Southern Atlantic Ocean and its orbital significance. Paper presented in the National Seminar on Challenges in Geophysics in 21^st Century, conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during Feb. 27 to March 1^st 2009.
29. Tiwari, R.K. and K.P.C. Kaladharara Rao (2009). Solar Forcing of the Western Himalayas Temperature Variability during the Past 800 Years. 46^th Annual Convention and Meeting on “Evolution of Himalayan Foreland Basin and emerging Exploration Challenges” , Indian Geophysical Union at Wadia Institute of Himalayan Geology, Dehradun , October 5-7.
30. Tiwari, R.K. and MamathaDirisala (2009) Non Parametric Time series modeling of the historical record of large volcanic eruptions. 46^th Annual Convention and Meetiong on “Evolution of Himalayan Foreland Basin and emerging Exploration Challenges” , Indian Geophysical Union at Wadia Institute of Himalayan Geology, Dehradun , October 5-7.
31. Tiwari, R.K., Tirupathi, M. and N.C. Mondal (2009) Application of Back-Propagation Artificial Neural Network Models for Prediction of Groundwater Levels. 46^th Annual Convention and Meeting on “Evolution of Himalayan Foreland Basin and emerging Exploration Challenges”, Indian Geophysical Union at Wadia Institute of Himalayan Geology, Dehradun , October 5-7.
32. Tiwari, R.K.,and Singh, D.K. (2009) Neurofuzzy Modeling and LithofaciesIdentification of Complex Geological Region using the KTB Well logs Data. 46^th Annual Convention and Meeting on “Evolution of Himalayan Foreland Basin and emerging Exploration Challenges”, Indian Geophysical Union at Wadia Institute of Himalayan Geology, Dehradun , October 5-7.
33. R.K. Tiwari (2009) Climate Change: Past, Present and Future Perspective. Inaugural Lecture delivered at the Kasturba Degree College for Women, Hyderabad during November, 2009.
34. SaumanMaiti and R.K. Tiwari (2010). Automatic detection of Litho-Fancies via the Hybrid Monte Carlo Based Bayesian Neural Networks Approach. Paper presented in the International seminar on “Society of Petroleum Geophysicists”, Hyderabad during 1-3 February, 2010
35. R.K. Tiwari (2010) Climate Catastrophe: Spectral Characteristics and Model Behavior of Abrupt Climate Changes Over Present to Millennial Time Scales.Paper presented in the Chapman International Conference on Complexity and Extreme Events in Geosciences at NGRI, Hyderabad during 15-19 February, 2010.
36. R.K. Tiwari and MamathaDirisala (2010) Non-parametric time series nalysis of episodic low sea level stand, mass extinction and volcanism during the past 20 million years. Paper presented in the National Seminar on “Modern Trends and Techniques in Geophysical Modeling & Computational Methods,” conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during March 29 & 30, 2010.
37. R.K. Tiwari and K.P.C. Kaladhara Rao (2010) Inter-hemispheric synchronization of climate variability: Evidence from the spectral analysis of principal components. Paper presented in the National Seminar on “Modern Trends and Techniques in Geophysical Modeling & Computational Methods,” conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during March 29 & 30, 2010.
38. R.K. Tiwari and M. Tirupathi (2010). Modeling Rainfall Data Using Artificial Neural Network. Paper presented in the National Seminar on “Modern Trends and Techniques in Geophysical Modeling & Computational Methods,” conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during March 29 & 30, 2010.
39. R.K. Tiwari and D.K. Singh (2010). Neurofuzzy Modeling and Lithofacies Identification of Complex Geological Region using well logs Data. Paper presented in the National Seminar on “Modern Trends and Techniques in Geophysical Modeling & Computational Methods,” conducted by Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad during March 29 & 30, 2010.
40. Delivered two invited lectures entitled (a) “Nonlinear Dynamics, Chaos and stability: An Introduction” (b) “Non-linear Time Series Modeling and Predictability of Chaotic Geo-physical Phenomena”at North-East Hill University, Shillong on 19^th June, 2010.
41. R.K. Tiwari and SaumenMaiti (2010) “Bayesian Neural Network Modeling of Temperature Variability Record from the Western Himalaya”. Paper presented at the 7^th Annual Meeting, of the AOGS 2010 International Convention, Hyderabad Centre during 5^th- 9^th July 2010.
42. Dhananjay Singh, R.K. Tiwari and M. Tirupathi (2010). Neural Network and Neuro-Fuzzy in Modeling of Highly Non-Linear Geophysical Well Logs Data – A Comparison. Paper presented at the 7^th Annual Meeting, of the AOGS 2010 International Convention, Hyderabad Centre during 5^th- 9^th July 2010.
43. R.K.Tiwari&M.Tirupathi (2012) Modeling of rainfall and temperature variability records using EOF spectra and Artificial Neural Network presented in Indian Science Congress 2012 at KIIT Bhubaneswar during 3^rd - 7^th Jan 2012.
44. R.K.Tiwari& M. Tirupathi (2012) Model dissection from the Geo environmental data : A comparative study using the modern nonlinear forecasting and Artificial Neural Network approaches presented at the Indian Geophysical Union – 2012 at Gandhinagar, Gujarat during 29-31^stOctober, 2012.
45. Tiwari, R.K., Krishnaveni, P. (2012). Evidence of self organization in great Sumatra earthquake recurrence times: Implications for coupling of tidal forcing and tectonic stress accumulation, AGU Fall Meeting San Fransico, December 3-7, 2012.
46. Rajesh, Rekapalli.,R.K.Tiwari, .and Seshunarayana, T. (2012) De-noising and clean reconstruction of seismic signals using space lagged singular spectral analysis, AGU Fall Meeting San Fransico, December 3-7, 2012.
47. Rajesh Rekapalli, R.K.Tiwari, T Seshunarayana, 2014, A new factorized hankel singular spectral technique (FHSST) for denoising seismic signal. Published in the proceedings of 50th annual convention of Indian Geophysical Union on “sustainability of Earth system the Future Challenges”
48. Rajesh Rekapalli, M.J Nandan and R.K.Tiwari , 2014, Ground water management at Manddollagudem TECHVIL cluster , Nalgonda District, Andhra Pradesh- Though Scientific Cultivation. Published in the proceedings of 50th annual convention of Indian Geophysical Union
49. Animesh Mandal, R.K.Tiwari, 2014, An overview of 3D seismic technique in coal field exploration and its future applicability in Indian coal field, Presented in the National Seminar on Advances in Geo-Exploration Techniques in the search for minerals under different geological settings at Osmania University, Depatment of Geophysics, Hyderabad.
50. P. Krishnaveni, R.K Tiwari, 2014, Predictability Analyses of earthquake recurrence time series of Uttarkashi earthquakes, India using Non-linear forecasting and Fractal Methods,Presented in the National Seminar on Advances in Geo-Exploration Techniques in the search for minerals under different geological settings at Osmania University, Depatment of Geophysics, Hyderabad.
51. B. Pamavathi, R.K.Tiwari, 2014, Climate and Soalr induced Oscillations in Indian temperatures over the last century,Presented in the National Seminar on Advances in Geo-Exploration Techniques in the search for minerals under different geological settings at Osmania University, Department of Geophysics, Hyderabad.
52. Rajesh Rekapalli, RK Tiwari, T Seshunarayana, 2014, Advanced Singular Spectral Methods for seismic data processing, Presented in the National Seminar on Advances in Geo-Exploration Techniques in the search for minerals under different geological settings at Osmania University, Depatment of Geophysics, Hyderabad.
53. Rajesh Rekapalli and R.K.Tiwari (2014) De-noising and data gap filling of 2D and 3D seismic data: A new Spatio - Temporal domain Singular Spectral Approach. Indian Geophysical Union, Kurukshetra, India; 11/2014
54. Rajesh Rekapalli, R.K.Tiwari, T.Seshunarayana (2014): Seismic reflection data processing from coal bearing zones using Singular Spectral algorithms. Association of Exploration Geophysicists, CSIR-NGRI, Hyderabad; 10/2014
55. Rajesh, R., Shubham K. Priyadarshi, R.K.Tiwari, (2015). Assessment of Singular Spectrum and Wavelet based de-noising schemes in generalized inversion based seismic wavelet estimation. Conference: Society of Petroleum Geophysics, At Jaipur-India, DOI: 10.13140/RG.2.1.4344.2640.
56. Rajesh, R.,&R.K.Tiwari. (2015). 2D and 3D seismic data processing using Time domain Multichannel SSA. Association of Exploration Geophycists, Jaipur-India; 10/2015
57. Rajesh, R., Tiwari, R. K., Sen, M. K., &Vedanthi, N. (2015). De-noising of 3D seismic data using multichannel singular spectrum based time slice and horizon processing. In R. V. Schneider (Ed.), SEG Technical Program Expanded Abstracts 2015 (pp. 4708-4713). Society of Exploration Geophysicists.
58. R.K.Tiwari and Rajesh Rekapalli (2015), Impact of Solar variability of hemispheric climate changes on multilateral time scales, IUGG annual meeting 2015, Prague.
59. Shubham K. Priyadarshi, Rajesh, R., …., (2016). A hybrid PSOGSA based inversion of noise corrupted seismic data using singular spectrum based time slice de-noising, In SEG Technical Program Expanded Abstracts 2016,, pp4835-4839.
60. Rekapalli, R. & R.K.Tiwari (2016).Evidences for coupled ocean atmospheric influence on earthquakes. FIGA-IGU, ISM-Dhanbad, India: 11/2016.
61. Rekapalli, R. & R.K.Tiwari (2016). 3D seismic data and horizon de-noising using Singular Spectrum based methods. FIGA-IGU, ISM-Dhanbad, India: 11/2016.
62. R.K.Tiwari & Rekapalli, R. (2016).Emerging singular spectrum based algorithms for 2D and 3D seismic data processing: Numerical results and field examples. FIGA-IGU, ISM-Dhanbad, India: 11/2016.
63. Rajesh, R., Tiwari, Ram Krishna, (2017). Time and Frequency domain Eigen Image and Cadzow filter for seismic data de-noising. 39th Annual Convention of Association of Exploration Geophysics, 5th October 2017 at Institute of Science, Banaras Hindu University, Varanasi.
64. Rajesh, R., Tiwari, R.K., Vedhanti, Nimisha, (2017). MSSA de-noising of horizon time structure to improve the curvature attribute analysis. AGU-Fallmeeting-2017, NS23A0002, https://agu.confex.com/agu/fm17/meetinga.
65. Rajesh et al., (2016). Fault identification by diffraction separation from seismic reflection data using time slice SSA based algorithm, In SEG Technical Program Expanded Abstracts 2016, pp3920-3924.