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Published April 1965 | Erratum + Published
Journal Article Open

A procedure for source studies from spectrums of long-period seismic body waves


The well-known first motion method of Nakano and Byerly is extended, generalized and combined with recent new ideas in body wave theory in order to set up a routine procedure for extracting source parameters from spectral analysis of isolated P and S pulses recorded at a net of standardized stations around a non-shallow source. The method consists of compensating the observed spectrums for instrumental and propagational effects. A combined study of the resulting radiation patterns, initial phases, and the initial amplitudes will render information regarding the spatial and temporal nature of deep and intermediate earthquake sources as seen through the spectral window of 10-100 seconds. The shorter periods can be used for source studies only if an accurate station correction is available.

Additional Information

Copyright © 1965, by the Seismological Society of America. Manuscript received October 21, 1964. This research was supported by contract No. AF-49(638)-1337 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency Project Vela and by AF-AFOSR 62-421. Discussions held with Dr. Robert Burridge are gratefully acknowledged.

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August 19, 2023
October 26, 2023