The binary data are available via anonymous FTP from the National Strong Ground Motion FTP-server:
ftp://smftp.wr.usgs.gov in directory GEOS/SFA.
The GEOS Home Page is at http://nsmp.wr.usgs.gov/GEOS/geos.html
The URL of this page is http://nsmp.wr.usgs.gov/GEOS/SFA/san_francisco_array.html
e-mail: glassmoyer@usgs.gov
or address:
Gary Glassmoyer
345 Middlefield Road M/S 977
Menlo Park, California 94025