Input Files

Input files

Parameter file (params.in)

A parameter file, in which tuning parameters and path to the other input files are specified, must exist in the current directory with the name 'params.in'. Otherwise, users need to give a path to the parameter file (with any file name) as the first argument in the command line:

mpirun -np 20 rf_inv path/to/the/parameter/file,

for example.

In the parameter file, all parameters must appear in the exact order as shown in the example below. Note that lines beginning with '#' are ignored.

Example

# Example of a parameter file for RF_INV (params.in)
#---------------------------------------------------------
# Output directory
#---------------------------------------------------------
# OUT_DIR: output directory 
          Note: quotation mark is necessary
'./result'
#
#---------------------------------------------------------
# Iteration
#---------------------------------------------------------
# N_BURN: Iteration number during a burn-in period
5000000
# N_ITER: Iteration number after the burn-in period
5000000
# N_CORR: Interval of iterations to save sampled model
#         Note: This is necessary to avoid artificial correlation  
#               between sample
200
#
#---------------------------------------------------------
# Parallel tempering
#---------------------------------------------------------
# N_CHAINS: Number of chains per processor
5
# N_COOL: Number of non-tempered chains per processor
#         (1 <= N_COOL <= N_CHAINS)
1
# T_HIGH: The highest temperature (>= 1.0)
50.0
#
#---------------------------------------------------------
# Random number
#---------------------------------------------------------
# I_SEED: seed number for random number sequence
56763298
#
#---------------------------------------------------------
# Input Data
#---------------------------------------------------------
# N_TRC: Number of input waveforms
3
# RAYP(1:N_TRC): Ray parameter for each trace (s/km)  
#                Note: You can save computation time when RAYP 
#                      are common for all traces
0.06
0.06
0.06
# A_GAUSS(1:N_TRC): Gaussian low-pass filter parameter for each trace
#                   (i.e., a in G(omega) = exp(-(omega^2/(4a^2))) 
8.0
4.0
1.0
# I_PHA(1:NTRC): Incident phase type for each trace (P: 1, S: -1)
1
1
1
# N_FFT: Sample number used in FFT
1024
# OBS_FILES(1:N_TRC): Input waveform files (SAC format)
#                     Note: A header 'delta' is required to 
#                           be common for all input waveforms.
#                     Note2: quotation mark is necessary 
'KMB06_120_150_a8.0_MC3.sac' 
'KMB06_120_150_a4.0_MC3.sac' 
'KMB06_120_150_a1.0_MC3.sac' 
# T_START T_END: Start and end of time window to be analyzed
#                Note: Direct P is assumed to arrive at t=0  
-1.0 10.0
# DECONV_MODE: Forward computation mode (0: w/o deconvolution, 1: w/ deconvolution)
1
#---------------------------------------------------------
# Velocity model
#---------------------------------------------------------
# SEA_DEP: Water depth (km)
#          Note: Seismic station is assumed to be placed on 
#                the seafloor when SEA_DEP > 0  
2.499
# VEL_FILE: Input file for reference velocity model
#           Format: depth(km)  Vp(km/s)  Vs(km/s)
#           Note:  Need evenly spaced for depth
#           Note2: quotation mark is necessary
'reference.mod'
#
#---------------------------------------------------------
# Inversion mode
#---------------------------------------------------------
# VP_MODE: (0: Fixed at reference model, 1: Solved)
1
#
#---------------------------------------------------------
# Prior probability 
#---------------------------------------------------------
# K_MIN K_MAX: Min. and Max. # of interfaces [min., max.)
1 31
# Z_MIN Z_MAX: Min./Max. of interface depth (km; below the sea level)
#              Note: You may want to set Z_MIN = SEA_DEP
2.499 20.0
# H_MIN: Minimum thickness of layer to be allowed (km)
0.05
# PRIOR_TYPE: Type of the prior probability distribution for 
#             velocity perturbations (1: Laplacian, 2: Gaussian)
2 
# DEV_DVS: Standard deviation for dVs prior (km/s)
0.1
# DEV_DVP: Standard deviation for dVp Prior (km/s)
0.2 
# SIG_MIN SIG_MAX: Min./Max. of noise sigma
#                  Note: Set SIG_MIN equal to SIG_MAX if you want to fix the noise level
0.005 0.08
#
#---------------------------------------------------------
# Proposal
#---------------------------------------------------------
# STEP_SIZE_Z: standard deviation for depth proposal
0.03
# STEP_SIZE_DVS: standard deviation for dVs proposal
0.02
# STEP_SIZE_DVP: standard deviation for dVp proposal
0.02
# standard deviation for noise sigma proposal 
0.005
#
#---------------------------------------------------------
# Figure
#---------------------------------------------------------
# N_BIN_Z: Number of bins for depth
100
# N_BIN_VS: Number of bins for Vs
50
# N_BIN_VP: Number of bins for Vp
50
# N_BIN_VPVS: Number of bins for Vp/Vs
100
# N_BIN_SIG: Number of bins for noise sigma
50
# N_BIN_AMP: Number of bins for amplitudes
100
# AMP_MIN AMP_MAX: Min./Max. amplitudes to be displayed
-0.6 0.6
#----------------------------------------
# Additional criteria
#----------------------------------------
# VP_MIN VP_MAX: Min./Max. Vp 
0.1 8.6
# VS_MIN VS_MAX: Min./Max. Vs
0.001 5.0
# VPVS_MIN VPVS_MAX: Min. / Max. Vp/Vs
0.0 10.0

Velocity file

Free-format ASCII file for a reference velocity model.

Format

1st Column	2nd Column	3rd Column
Depth of layer top	P wave velocity (km/s)	S wave velocity

Note

The depth increment must be constant.

Waveform file

SAC format file that contains input waveform data.

Format

• SAC format
  • only the following header values are used.
    • delta
    • b
    • npts