Some notes for the research are collected/written here:

Data processing

• SAC的時間概念

• Filter中參數p的特性

• A useful SAC commend: cuterr fillz (used to fill up zeros if there is no data point to cut in demanded time period)

• IRIS web notes about common rotations in seismology

• The SAC command interpolate for down-sampling is clearly aliasing once the sampling rate is less than 100 Hz, so the command decimate is always preferred.

• The unit of the seismograms extracted from seed file is usually in meter, and that downloaded from STP with gain on is in centimeter (count is provided with gain off).

• NetCDF user's guides [1][2][3]

• IRIS PH5 coverter program

• A simple array transpose commend in Linux: sed 's/ /\n/g'

• 2D Fourier transform [1][2]

• Phase-weighted stack and packages [1][2][3]

Waveform simulation

• The unit of displacement data downloaded from BATS is meter, which is the same with that of SEM synthetics but different from that of FK synthetics. The unit of FK synthetics is centimeter.

• Since FK uses impulse function instead of step function as moment function, the output of FK is actually velocity seismograms/Green's functions, not displacement.

Instrument

• The flat-response frequency band of Palert MEMS sensor ranges 0.05-15 Hz (ca. 0.1-10 conservatively).

• Instructions for Raspberryshake's wifi setup

• IRIS seed channel naming

• Descriptions of instrument response file by IRIS

Mathematics

• Lagrage multiplier (拉格朗乘數)

• Integration by parts (分部積分)

• Mean and Variance of Sample Mean

• 連續隨機變數的期望值

• 微積分公式

• The basics of Fourier transform

• Frequency domain representation of the time delay

• Geographic Distance and Azimuth Calculations [1][2]

• A cool illustration of numerical optimization

• An Intuitive (and Short) Explanation of Bayes' Theorem

• Interpolation methods

• Introduction to splines

• PCA vs. ICA [1][2][3]

• Bootstrap vs. Jackknife [1][2]

• Animated math - An amazing website to make math and life easier!

• How Bayesian inference works

• Kalman filter [1][2][3][4][5][6]

• Laplace transform

• Power spectral density (PSD)

• Optimal Transport [1][2][3]

English writing

• 英文論文寫作時態 [1][2]

• To + V or To + Ving

• While & When

• For the reason - as/because; For this reason - therefore, thus

• "Due to" is used as an adjective, and "because of" is used as an adverb.

Programming/OS

• Get Julian day in Linux: date -d "2010/10/30" +%j

• Comparable commands between Windows and Linux

• Unix 重新導向跟 2>&1

• Difference between calling by value, by address, and by reference in C/C++

• Some useful Fortran tricks

• 遠端連線時Screen的用法

• Install Torque on Centos 6

• Install CentOS Extras repository

• 簡易Cluster架設 by鳥哥

• Linux動態&靜態函式庫說明

• Linux記憶體的運作方式[1][2][3]

• Using the SAC library in Fortran/C codes

• Default block size of binary files is different for ifort (4 bytes) and gfortran (1 byte), therefore using recl=1 for ifort is equivalent to uisng recl=4 for gfortran compiler

• MPI vs OpenMP

• OpenMP簡易的平行化方法

• rsync檔案同步與備份教學與範例

• Linux用convert指令製作動畫

• Transfer files from old to new Macbook [1][2]

• Python | tutorial | Anaconda | ObsPy | w/ fortran | w/ C | tensorflow | PyTorch | Numba | ordpy

• Jupyter notebook | hot keys | basics

• Julia | Observer | Precompile | Multithreading | Examples | Juno

     Modules: Pkg | IJulia | Seis | SAC | GMT | Flux | Knet | SciML | HTTP2 | Blink | CUDA | SeisIO | SeisNoise | Unet | SnoopCompile | PackageCompiler

Machine learning

• 機器學習入門 [1][2][3][4][5][6][7]

• 演算法分類 [1][2]

• Unsupervised algorithms: K-means, SVM, Autoencoder, Sequencer, tslearn

• Supervised algorithms:

• CNN vs RNN

• U-net: [code][1][2]

• Neural Networks and Deep Learning by Michael Nielsen

• Ensemble learning [1][2][3]

• YOLO7 [Github][1][2]

• Manifold learning

• Fourier Neural Operator for PDEs

• tslearn

• Scikit-Image

• EQtransformer

• BlocklyEQTransformer

• Deep Topological Analysis [1][2]

• Vector Quantization [1][2]

DAS

• Technical article: What Is DAS And What Is It Measuring?

• Great introductory videos [1] [2] [3] [4] [5]

• Github resources: Xdas | DASCore

• Data processing: idas-convert | Pyrocko

Miscellaneous

• The wave-guided effect of subducted plate (with high-frequency content and sustained coda) observed in Taiwan region mainly takes place in a frequency band >3 Hz. (Chen et al., 2013)

• The evocative "super-eruption" is an informal term referring to volcanic events in which at least 300 km^3 of magma are explosively evacuated from a subsurface magma chamber (Sparks et al. 2005). Any volcanic system that has produced a super-eruption is consequently dubbed a "super-volcano".

• Temperature of magmas (in Celsius): Basaltic magma - 1000-1200, Andesitic magma - 800-1000, rhyolitic magma - 650-800.

• Terminology aliases between solid Earth (left) and exploration (right) seismology:
  source time function  |  source wavelet
  epicentral distance  |  offset
  seismogram  |  trace
  station  |  receiver
  seismic event  |  source
  phase  |  event

• Slowness u(s/deg) ~ u(s/km) * 111.91

• Rule of Thumb: building natural frequency (s) ~ 1/10 *number of storey

• Migration in practice

• Linear vs. Non-linear elasticity

• Seismic data channel naming [IRIS][CWB]

• 數學、拉丁、標記符號的念法

Online books

• Python Programming And Numerical Methods: A Guide For Engineers And Scientists

• Forecasting: Principles and Practice

• The rock physics handbook

• The Python Coding Book

• Machine Learning in the Geosciences

To-buy list

• Theory of linear poroelasticity with applications to geomechanics and hydrogeology