OCTAVE saswv.m - SASW analysis of Cross Power Spectral recordings
saswv prompts for:
BSEGY file name
(*.txt) (shell terminal input)
Plot Settings: fmin, fmax (GUI entry box)
SASW is Spectral Analysis of Surface Waves. Only requires source and two geophones.
Basic Seismic Utilities (BSU) program run in Octave or Matlab. Within an octave session, type saswv and then on prompt, enter the data file name (ex. dx32f.txt). The plot setting GUI is for display purpose but is limited by what data are available in the file. This program is a sample demonstration code specific to the SASW Benchmark project conducted by members of the Geophysical Engineering Committee. Papers on this project can be found in GeoRisk 2011 / ISBN 9780784411834 GSP 224 Published by ASCE.
The differences between SASW.m and saswv.m are in the source and type of data. SASW.m reads two time domain recorded signals from a single file while saswv.m reads measured cross-power spectra and coherence. Thus, SASW.m must compute the cross spectra and coherence where as saswv.m uses measurements of those properties.
Figure 1 Cross
Power Spectrum and Coherence
Figure 2 Phase velocity frequency dispersion estimates and
coherence measurments.
Octave
OCTAVE: SASW.m(7)
No known bugs.
Copyright © 2017 by Paul Michaels
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
P. Michaels, PE. <pm@cgiss.boisestate.edu>