A Seismic Study of Travel-Time Anomalies, Network Effects and Location Techniques in the Aleutian Islands
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA LAB
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A study was made of a set of well-recorded Aleutian Islands earthquakes and the nuclear explosion LONG SHOT. Whereas past studies of travel- time anomalies and location errors have been based on seismic signals from explosions, the main object of the current study has been to extend our working principles to seismic data from earthquakes. Using a selected teleseismic station network, travel-time anomalies were computed and various techniques applied to achieve location consistency across the entire region. Using LONG SHOT as a bias control point, a set of segmented constant anomalies were derived for the network of stations used. To demonstrate the difficulties of locating events in the Aleutian Islands, well-distributed sub-networks of a 329-station network were used to locate LONG SHOT.
- Seismic Detection and Detectors