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Seismic evidence for a fossil oceanic lithosphere preserved inside a continent
Seismic evidence for a fossil oceanic lithosphere preserved inside a continent
2023-01
We have documented a newly identified paleo-oceanic lithosphere preserved in the middle of the present-day Eurasian continent. Through surface wave tomography, we have demonstrated that parts of the ancient Paleo-Asian oceanic lithosphere have escaped the fate of complete subduction/consumption and have been preserved beneath the Junggar Basin in NW China since the late Paleozoic, finally becoming a piece of the Eurasian continent. We believe that under similar geologic conditions, the scenario is likely to have occurred in other continents throughout Earth’s history, providing an additional and commonly underestimated contribution to the growth of the continental lithosphere.
The paper has been published in Geology:
A new crustal azimuthally anisotropic model of Southern California
A new crustal azimuthally anisotropic model of Southern California
2022-08
A new paper has been published in GRL! In this study, we construct a high-resolution azimuthally anisotropic model for the crust of southern California using local P-wave traveltime data accumulated in the past 40 years. We use the newly developed adjoint-state traveltime tomography (ATT) technique, in which the sensitivity kernels with respect to P-wave slowness and azimuthal anisotropy can be precisely calculated. Our model reveals complex anisotropy variations between tectonic blocks at different depths, which are jointly shaped by the present and past plate boundary deformation. Our model sheds new light on the deformation regimes in the crust of the southern California plate boundary region.
Details can be found at https://doi.org/10.1029/2022GL100233.
Model files: https://doi.org/10.21979/N9/JQDOAQ.
Exploring the Moho reflected PmP data: Case studies in Southern California
Exploring the Moho reflected PmP data: Case studies in Southern California
2022-04
PmP waves originating from crustal earthquakes are reflected waves from the outer side of Moho, and they contain important information on the geometry, velocity change, and compositional change of or across the Moho. In this project, we develop a new workflow for picking robust PmP arrivals and use the newly picked PmP arrival times to study the crustal structures of Southern California, including Moho geometry and crustal velocity.
Three related papers are recently published in JGR-Solid Earth and Tectonophysics: https://doi.org/10.1029/2021JB023033 https://doi.org/10.1016/j.tecto.2022.229328 https://doi.org/10.1029/2021JB023582
Check out our new paper on the geophysical constraints on gold mineralization in western Junggar, NW China
Check out our new paper on the geophysical constraints on gold mineralization in western Junggar, NW China
2021-11-06
The new paper is published in Ore Geology Reviews, led by Prof. Yixian Xu from Zhejiang University. In this paper, we present geophysical observations of the medium-scale Baogutu porphyry copper-gold deposit and the large-scale Hatu epithermal gold deposit from the late Paleozoic arc in the western Junggar, NW China. We conclude that the endowments of mineralization in arcs are controlled by crustal structures and contemporaneous arc magmatism during subduction.
Our newly purchased 80 SmartSolo IGU-16HR 3C nodes have arrived!
Our newly purchased 80 SmartSolo IGU-16HR 3C nodes have arrived!
2021-09-26
The newly purchased geophones will be used to image shallow structures of Singapore in collaboration with the School of Civil and Environmental Engineering at NTU, Singapore.
We may first focus on the Sembawang hot spring areas in Singapore, aiming to generate high-resolution subsurface images for the purpose of geothermal energy exploration. We also plan to deploy these geophones across Singapore later, hoping to build a seismic reference velocity model for Singapore using passive seismic data.
Unraveling Myanmar’s underground structure to better prepare for future geohazards
Unraveling Myanmar’s underground structure to better prepare for future geohazards
2021-05-31 Sourced from EOS blog
A new paper published in Earth and Planetary Science Letters! We have proposed a new 3D shear-wave velocity model for the subsurface structure of the crust and uppermost mantle down to a depth of 80 kilometers (km) below Myanmar, which may help in understanding the region’s geology and tectonic activity.
In this study, we used ambient noise data collected from 55 seismic stations. These stations, which are mostly from the EOS-Myanmar array and EOS Temporary REceivers for Monitoring BangLadesh Earthquakes (TREMBLE), are spread out over the country and in neighboring Bangladesh.
Paper: https://doi.org/10.1016/j.epsl.2021.116856
Data and final velocity model: https://doi.org/10.21979/N9/OTNAWV
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