Gpell

Synopsis

gpell [OPTIONS] [FILE]

Description

Compute ellipticity 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)>[ <Qp> <Qs>]
 ....
 Line n    0 <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 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.

Gpell options

• -n <count> Number of samples (default=100)
• -R <n modes> Number of Rayleigh modes (default=1)
• -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 ellipticity curve (default=0.2) -max <max> Maximum of range for ellipticity curve (default=20) -n <count> Number of samples (default=100) -p Output frequency peaks only -c Output curves only -pc Output curves only with peak refinements

Generic options

-help <SECTION> Show help about options. SECTION may be empty or: all, html, latex, examples,

                           generic, gpell

-version Show version information -app-version Show short 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.

-reportint Start bug report dialog, information about interruption is passed through

                           stdin. This option is used internally to report interruptions if option
                           -nobugreport is not specified.

-nobugreport Do not generate bug report in case of error

Examples

 gpell < test.model

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

 gpell < test.model | figue -c

Calculate the same ellipticity curve and plot it.

 gpell < test.model | figue -c -m ell.mkup

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

Copyright

Copyright (c) 2002-2008 Marc Wathelet. All rights reserved. See http://www.geopsy.org for more information.