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| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
LAMONT DOHERTY GEOLOGICAL OBSERVATORY DEPARTMENT OF GEOLOGICAL SCIENCES COLUMBIA UNIVERSITY, PALISADES, NEW YORK 10964
Abstract
The far-field body wave radiation from a class of circular rupture models is investigated as a function of takeoff angle, rupture velocity, and stopping behavior. In particular, the variation of spectral shape, pulse shape, and energy flux over the focal sphere is quantified. These results provide two new methods for estimating the source dimension, the first through the inversion of a characteristic frequency, and the second using the rise time of the displacement pulse shape. The class of kinematic rupture models which has been constructed also allows a direct estimate of the dynamic stress drop using the velocity pulse shape: as an example, this technique is applied to an SMA1 recording of a high stress drop Aleutian earthquake, Finally, the introduction of a new spectral parameter, the integral of the square of the ground velocity, is shown to considerably simplify calculation of the total radiated energy. Together with a re-evaluation of corner frequency and spectral falloff, these new results constitute a spectral theory for circular seismic sources which includes directivity and is valid for a range of subsonic rupture velocities.
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P. SILVER Retrieval of source-extent parameters and the interpretation of corner frequency Bulletin of the Seismological Society of America, December 1, 1983; 73(6A): 1499 - 1511. [Abstract] [PDF]
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A. FRANKEL and H. KANAMORI Determination of rupture duration and stress drop for earthquakes in southern California Bulletin of the Seismological Society of America, December 1, 1983; 73(6A): 1527 - 1551. [Abstract] [PDF]
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J. B. FLETCHER, J. BOATWRIGHT, and W. B. JOYNER Depth dependence of source parameters at Monticello, South Carolina Bulletin of the Seismological Society of America, December 1, 1983; 73(6A): 1735 - 1751. [Abstract] [PDF]
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J. MORI Dynamic stress drops of moderate earthquakes of the Eastern Aleutians and their relation to a great earthquake Bulletin of the Seismological Society of America, August 1, 1983; 73(4): 1077 - 1097. [Abstract] [PDF]
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W. B. JOYNER and D. M. BOORE Peak horizontal acceleration and velocity from strong-motion records including records from the 1979 imperial valley, California, earthquake Bulletin of the Seismological Society of America, December 1, 1981; 71(6): 2011 - 2038. [Abstract] [PDF]
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