Average P and PKP Codas for Earthquakes (103 degrees-118 degrees)
Abstract
An analysis of seismograms of 26 small events (m sub b = or < 5.8) recorded at a world-wide network of 10 stations, and of 26 large events (m sub b, M sub s, or secondary m sub b = or > 7.0) recorded at a world-wide network of 16 stations, yielded an estimate of the coda decay characteristics for events in the distance interval 103-118 degrees. For times greater than the arrival time for the PP phase, large event codas are about 0.11 m sub b units greater than small event codas at corresponding times into the codas. This supports the hypothesis that large events are multiple events, and the period of source activity is estimated to be one to two minutes. Two sets of average coda decay curves, one each for large and small events, are given for the following distance intervals: 103-105 degrees, 105-110 degrees, 110-115 degrees, and 115- 118 degrees.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 10, 1974
- Accession Number
- ADA009890
Entities
People
- E. I. Sweetser
- T. J. Cohen