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A New Event Detector Designed for the Seismic Research Observatories

Open-File Report 83-785

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Abstract

A new short-period event detector has been implemented on the Seismic Research Observatories. For each signal detected, a printed output gives estimates of the time of onset of the signal, direction of the first break, quality of onset, period and maximum amplitude of the signal, and an estimate of the variability of the background noise. On the SRO system, the new algorithm runs ~2.5x faster than the former (power level) detector. This increase in speed is due to the design of the algorithm: all operations can be performed by simple shifts, additions, and comparisons (floating point operations are not required). Even though a narrow-band recursive filter is not used, the algorithm appears to detect events competitively with those algorithms that employ such filters. Tests at Albuquerque Seismological Laboratory on data supplied by Blandford suggest performance commensurate with the on-line detector of the Seismic Data Analysis Center, Alexandria, Virginia.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A New Event Detector Designed for the Seismic Research Observatories
Series title:
Open-File Report
Series number:
83-785
Edition:
-
Year Published:
1983
Language:
ENGLISH
Publisher:
Geological Survey (U.S.)
Contributing office(s):
Albuquerque Seismological Laboratory
Description:
Report: 39 p.; 5 Plates