Accession Number:

AD0840712

Title:

A PRELIMINARY EVALUATION OF THE MATCHED FILTER TECHNIQUE IN THE DETECTION OF LONG-PERIOD BODY WAVE RADIATION

Descriptive Note:

Seismic data laboratory rept.

Corporate Author:

TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s):

Report Date:

1968-07-30

Pagination or Media Count:

48.0

Abstract:

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.

Subject Categories:

  • Seismology
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE