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Open-File Report 2002-002

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Prepared in cooperation with with the Connecticut Department of Environmental Protection

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

 

Illustration: conversion chart for seismic recorder display scales.
SWEEP RATE (MSEC) SWEEP RATE (SEC) APPROXIMATE DEPTH RANGE
FROM THE SURFACE DISPLAYED (M)
1000 1 750
500 1/2 375
250 1/4 187.5
125 1/8 93.7
62.5 1/16 46.9

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).

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