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Published December 1967 | Published
Journal Article Open

Excitation of mantle Rayleigh waves of period 100 seconds as a function of magnitude


The excitation of mantle Rayleigh waves of 100 seconds period as a function of magnitude is studied using data from 91 earthquakes in the magnitude range 5.0 to 8.9. The data were recorded on a wide variety of instruments including Milne-Shaw horizontal pendulums and modern long-period high-gain inertial seismographs. The larger earthquakes studied range in time from 1923 to 1964. Mantle Rayleigh wave amplitudes are corrected to a distance of 90° and plotted as a function of surface wave magnitude. The data are compared with theoretical curves based on a moving source model and two statistical models discussed by Aki. It is concluded that for large earthquakes the source may be approximated by a point couple which propagates a distance given approximately by the length of the aftershock zone.

Additional Information

Copyright © 1968, by the Seismological Society of America. Manuscript received May 16, 1967. One of the authors (Chi-Yu King) was a post-doctoral fellow at the California Institute of Technology while participating in the study. Special thanks are due to Mr. Robert Eppley of the U. S. Coast and Geodetic Survey who made many of the amplitude readings from Columbia ULP records and to Mr. Ralph Gilman who provided records from the Pasadena (PAS) ULP instruments and assisted in the preparation of the paper. The authors are indebted to Professor Keiiti Aki for critically reading the manuscript and offering constructive criticism. Professor Stewart Smith provided records and calibration curves for the Isabella (ISA) station. This research was supported in part by the U. S. Coast and Geodetic Survey under contract CGS 1091 (G) while the first author was at Lamont Geological Observatory, the National Science Foundation under grant GP 2806, and the Air Force Office of Scientific Research, Office of Aerospace Research, United States Air Force, under AFOSR contract AF-49(638)-1337.

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