A PRELIMINARY EVALUATION OF THE MATCHED FILTER TECHNIQUE IN THE DETECTION OF LONG-PERIOD BODY WAVE RADIATION
Seismic data laboratory rept.
TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV
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Using nine elements of the Montana LASA, long-period body wave radiation was detected at SN ratios as low as 1 for synthetic test cases. In these instances beamforming the 9 matched filter outputs improved the SN ratio by a factor of 2 over straightforward phased summation of the raw data. For real data, the results are less satisfactory. However, from a limited sequence of Kurile Island events we establish an approximate threshold of m sub b 5 above which we can direct long-period body wave radiation. The results demonstrate the need for a better understanding of long-period body wave excitation as a function of magnitude and focal depth for earthquakes.