S/P Travel Time Ratio in Central Asia
Abstract
The S/P travel time ratio for intermediate depth Hindu-Kush earthquakes is investigated, using S and P arrival times at six World Wide Standard Seismograph Network stations and 19 other close-in stations. Station mean values of the ratio range from 1.74 to 1.81, with an overall mean value of 1.78. The S/P travel time ratio increases slowly with increasing distance over the distance range 4.5 to 13.0 degrees, and increases rapidly with decreasing distance for distances less than 4.5 degrees. Variation of the ratio with focal depth is weak. The standard deviation of S/P origin time deviations from origin times based on locations restrained to pp depth is about 1.0 second, implying a standard deviation of S/P depth error, relative to pp depth, of 10 to 12 km.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1974
- Accession Number
- AD0787873
Entities
People
- Jack G. Swanson
Organizations
- Teledyne Technologies