A PRELIMINARY EVALUATION OF THE MATCHED FILTER TECHNIQUE IN THE DETECTION OF LONG-PERIOD BODY WAVE RADIATION
Abstract
Using nine elements of the Montana LASA, long-period body wave radiation was detected at S/N ratios as low as 1 for synthetic test cases. In these instances beamforming the 9 matched filter outputs improved the S/N 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 30, 1968
- Accession Number
- AD0840712
Entities
People
- P. Glover
Organizations
- Teledyne Technologies