THE EFFECT OF CRUSTAL STRUCTURE ON TELESEISMIC P-WAVE TRAVEL-TIME ANOMALIES AT THE TFSO EXTENDED ARRAY, ARIZONA.
Abstract
Large-scale arrays may have significant travel-time differences between widely separated array elements which can hamper the use of signal processing techniques and lessen the precision of epicenter location. These travel-time anomalies are related to regional and local geological and geophysical properties of the crust and upper mantle although estimates of the contribution of each commonly result from conjecture and speculation. This study examines observational data from 33 teleseismic events received at stations of the Tonto Forest Seismological Observatory (TFSO) extended array in Arizona to determine travel-time anomalies for array stations relative to TFSO. Using a crustal model resulting from recent seismic-refraction surveys, it has been determined that crustal travel-time differences between stations cannot account for the travel-time anomalies and that a more thorough study of the upper mantle must be made if causal relationships are to be determined. Some methods of accomplishing this are suggested. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 18, 1966
- Accession Number
- AD0480350
Entities
People
- J. K. Westhusing
Organizations
- Geotech Instruments (United States)