Contents

GPDC

NAME

gpdc - Computation of dispersion curves

SYNOPSIS

gpdc [OPTIONS] [FILE]

DESCRIPTION

Compute dispersion curve for layered models given through stdin or FILE.

Format for layered models:

Line 1 :: <number of layers including half-space for first model>
Line 2 :: <thickness (m)> <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qs> <Qp>]
....
Line n :: 0 <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qs> <Qp>]
Line n+1 :: <number of layers including half-space for second model>
....

Quality factors are not mandatory. If not specified, pure elastic computation is performed. Any number of models can be given as input.

Generic options:

-help: Show help about options
-version: Show version information
-reportbug: Start bug report dialog, information about bug is passed through stdin. This option is used internally to report bugs if option -nobugreport is not specified.
-nobugreport: Do not generate bug report in case of error

Gpdc options:

-n <count>

Number of samples (default=100)

-L <n modes>

Number of Love modes (default=0)

-R <n modes>

Number of Rayleigh modes (default=1)

-group

Switches to group slowness (default=phase)

-s <sampling>

Defines the sampling type:

period: regular sampling in period
frequency: regular sampling in frequency
log: regular sampling in log(frequency) --> default

-min <min>

Minimum of range for dispersion curve (default=0.2)

-max <max>

Maximum of range for dispersion curve (default=20)

-n <count>

Number of samples (default=100)

EXAMPLES

gpdc < test.model

Calculate fundamental Rayleigh dispersion curve from 0.2 Hz to 20 Hz for model 'test.model'.

gpdc -L 1 -R 2 < test.model

Calculate fundamental Love mode and fundamental and first higher mode for Rayleigh.

gpdc < test.model | figue -c

Calculate the same dispersion curve and plot it.

gpdc < test.model | figue -c -m dc.mkup

Show the same dispersion curve on a log-log plot. 'dc.mkup' is a tar.gz file containing a xml description of the graphic format, it can be generated from figue's interface.

COPYRIGHT

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with the Invariant Section being "GNU Free Documentation License". A copy of the license is found in geopsy manual in section entitled "GNU Free Documentation License".