U.S. Geological Survey Open-File Report 02-002
Geological Framework Data from Long Island Sound, 1981-1990:
A Digital Data Release
Conversion Chart for Seismic Recorder Display Scales
|SWEEP RATE (MSEC)||SWEEP RATE (SEC)||APPROXIMATE
FROM THE SURFACE DISPLAYED (M)
Seismic records display only the signal being returned from the bottom (one-way travel time). Early Seismic recorders were calibrated to a fixed speed of sound in salt water of 1500 m/sec. Therefore, the displayed scale for a 1 second sweep would be 750 m (K. Parolski, USGS, Written Communication, 2001).