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Accession Number:
AD0831051
Title:
AN EXPERIMENT IN EVENT DETECTION AND LOCATION WITH LASA WAVENUMBER SPECTRA
Corporate Author:
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICE DIV
Report Date:
1968-02-15
Abstract:
The report describes an experiment testing a technique for the simultaneous detection and epicenter location of seismic events. The technique, which consists of computing high-resolution frequency-wavenumber spectra for each of a series of adjacent or overlapping time gates, is applicable to any array station. A LASA recording of a very weak teleseismic event was selected for the experiment. After examining the subarray straight-sum traces, a high- resolution wavenumber spectrum was computed at the frequency of peak signal energy for a single subarray. Epicenter location is more precise from the large- array wavenumber spectrum than from that obtained with a single subarray. However, the subarray spectrum yields a location sufficiently accurate for efficient postdetection processing at the network level and requires no preprocessing. The highly arbitrary preprocessing required for the detection and location of the event at the large-array level indicates the impracticality of using such a large array for this type of continuous worldwide surveillance.
Descriptive Note:
Advanced Array Research Special rept. no. 14
Pages:
0031
Distribution Statement:
Approved for public release; distribution is unlimited.
Contract Number:
F33657-67-C-0708
Contract Number 2:
ARPA ORDER-624
File Size:
1.26MB
