ACCESSING EVENT WAVEFORM DATA FILES FROM THE
                   VIRGINIA TECH SEISMIC OBSERVATORY

OVERVIEW

Following is a discussion on accsessing digital waveform data files
recorded by the Virginia Tech Seismic Observatory (VTSO).

The files in subdirectory /events/ include the following:
1996events.lis
1997events.lis
1998events.lis
1999events.lis
2000events.lis
2001events.lis

These files list the events for which waveform data are accessible.
Below is an example: 1999events.lis

        WAVEFORM DATA ACCESSIBLE IN Subdirectory 99
  file      net                       remarks
992290013 E N=0      Turkey M=7.3, Aug 17, 1999
992631600 E N=0      Taiwan, sept 20, 1999
992731635 E N=0      Mexico, Sept. 30, 1999 Ms=7.5
992890948 E N=0      Hector Mine, California, oct. 16, 1999
992940819 E N=0      New Madrid seismic zone, mblg 3.9, oct 21, 1999
993161657 E N=0      Turkey M=7.1, Nov. 12, 1999
993260031 E N=0      Wythe Co., Va, MD=1.5, Nov. 22, 1999
993351926 E N=0      South of Cayman Islands, mb=6.3, Dec. 1, 1999

Under file is the time of the event, in format YRdayhrmin.  For
example, 992290013 indicates 1999, day number 229, 00HR 13min UTC.
This time is used as the directory name containing the waveform data
for the respective events.

For example, the waveform data for the Wythe Co. Va earthquake that
occurred on Nov. 22, 1999 is in subdirectory 99/993260031.

The data for events subsequent to 1997 are written in SAC format.
Instrument response files as well as other information such as
Hypoellipse output files may also be found in the waveform
subdirectory. 

The user is encouraged to contact us with questions regarding the
use of these data.

contact:

Martin Chapman
ph: 540-231-5036
email: mcc@vt.edu