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Frequency response of the USGS short period telemetered seismic system and its suitability for network studies of local earthquakes

Open-File Report 77-844

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Abstract

The USGS telemetered seismic system was intended primarily to record small to moderate earthquakes (magnitude 0 to 4) at distances of a few km to several hundred km. Its frequency response is such that the recorded background noise at a moderately quite Coast Range site has a relatively flat 'record' spectrum from about 1/3 Hz to about 20 Hz. With the system magnification set so that the background noise is clearly recorded (about 1 mm peak-to-peak) one can anticipate that any seismic signal that exceeds background noise appreciably in this spectral region will be large enough to be seen on the seismogram. This response represents the highest sensitivity and broadest bandwidth that we were able to attain with a 1-Hz seismometer, a simple amplifier VCO employing very low-power integrated circuits, and an 8-channel constant-bandwidth FM subcarrier multiplex system for use with commercial voice-grade phone lines.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Frequency response of the USGS short period telemetered seismic system and its suitability for network studies of local earthquakes
Series title:
Open-File Report
Series number:
77-844
Edition:
-
Year Published:
1977
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Contributing office(s):
Earthquake Science Center
Description:
45 leaves :ill. ;28 cm.