Syn_seis

Software to compute synthetic seismograms for an incidence P or SV wave to 1-D layered structure.

(c) Takeshi Akuhara 2020

Earthquake Research Institute, The University of Tokyo

Installation

1. cd src
2. make

It requires FFTW and SAC libraries on your machine. The paths for these libraries must be specified in src/Makefile. If the SAC commands are already available, sac-config --cflags --libs sacio will display the paths to the SAC library.

Test run

bin/syn_seis < sample/test.in

• Don't forget to put "<".
• After this command, you will get output files test.r and test.z.

How to use

The program reads parameters and a velocity model from the standard input. The formats are:

• Line 1: [output file index]
• Line 2: [number of elements in output time series] [sampling interval (s)] [Time shift (s)]
• Line 3: [number of layers] [ray parameter (s/km)] [phase type: 1 for P; -1 for S]
• Lines 4...: [Vp (km/s)] [Vs (km/s)] [density (g/cm^3)] [thickness (km)]

Note:

• For ocean setting, set Vs < 0 for the topmost layer. In this case, the receiver is assumed to be placed on the seafloor (i.e., layer 1-2 boundary).
• Thickness of the bottom layer is just ignored.
• Output is SAC format. t=0 corresponds to the timing when incidence wave passes through the deepest layer interface (i.e., top of the half-space).