USGS Open-File Report 02-002: Sweep Rate Conversion Chart for Seismic Recorder Display Scales

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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Department of the Interior > U.S. Geological Survey > Coastal and Marine Geology Program > Long Island Sound Studies
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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).