Seismic switch for strong motion measurement

Details Seismic switch for strong motion measurement Seismic switch for strong motion measurement

1993-02-09

1995-05-30

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Seismic wave detection

367178, 340690, G01V 124, G08B 2100

Patent

active

054203805

ABSTRACT:
A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.

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