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

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGYDIVISION OF GEOLOGICAL SCIENCES, PASADENA, CALIFORNIA
LAMONT GEOLOGICAL OBSERVATORY COLUMBIA UNIVERSITY, PALISADES, NEW YORK

Abstract

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.

Footnotes

^* Now at the Institute of Geophysics and Planetary Physics, University of California, Los Angeles.

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