Some notes for the research are collected/written here:

**Signal 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).

**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**- Useful noise comparison plots
- The flat-response frequency band of Palert MEMS sensor ranges 0.05-15 Hz (ca. 0.1-10 conservatively).

**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

**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**- 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++
- The Hitchhiker's guide to Python
- 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
- 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

**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

**To-buy list**- Structural geology algorithms: Vectors and tensors
- An Introduction to the Theory of Seismology (2nd Edn)
- A Guided Tour of Mathematical Methods for the Physical Sciences
- Introduction to Numerical Geodynamic Modelling
- Deformation of Earth Materials: An Introduction to the Rheology of Solid Earth
- International Handbook of Earthquake & Engineering Seismology