Extraction of Seismic Waveforms
Technical rept. no. 14
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
Pagination or Media Count:
This report considers the effects on detectability and measurability resulting from attempts to extract seismic waveforms by application of cascaded processors and polarization filters. Previous work has shown that bandpass or Wiener filters when cascaded with the three-component surface wave adaptive processor caused improvements of as much as 0.8 m sub b units in the 50 percent detection threshold of surface waves. This report shows that by using a larger data base, this improvement in the detection threshold is 0.5 units. It is also shown in this report that surface wave magnitudes measured on data processed by the bandpass filter-three-component surface wave adaptive processor cascaded combination compare well with surface wave magnitudes measured on bandpass filtered data, however, surface wave magnitudes measured on data processed by the Wiener filter-three-component surface wave adaptive processor do not.
- Seismic Detection and Detectors