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Source wave forms of three earthquakes

Benioff, Hugo (1963) Source wave forms of three earthquakes. Bulletin of the Seismological Society of America, 53 (5). pp. 893-903. ISSN 0037-1106.

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Strain seismograms of the Montana shallow earthquake of August 17, 1959 recorded at Isabella, California have the wave pattern predicted in 1904 by Lamb for a surface pressure pulse. This is equivalent to a dipole source such as given by the vertical bilateral fault slip which was observed at the surface. Similar recordings made at Ñaña of the deep Peruvian earthquakes of August 19 and 30, 1961, (Δ = 600 ± km, h = 600 ± km) have the pattern calculated by Pekeris for a buried vertical downward force in the form of a step in time. It thus appears that these shocks were generated by a sudden volume contraction at the focus which could be the result of a sudden change of state. Failure of conventional seismographs to record the patterns calculated by Lamb and by Pekeris is due to their low sensitivity to the very long period ground movement components involved, and their relatively high sensitivity to the short period components which are rendered oscillatory by the departure of the crustal characteristics from the homogeneous half space assumed in the theoretical computations.

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Additional Information:Copyright © 1963, by the Seismological Society of America. Manuscript received April 9, 1963. This research was supported by Contract AF-AFOSR-62-355 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency's VELA UNIFORM Program.
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Air Force Office of Scientific Research (AFOSR)AF-AFOSR-62-355
Advanced Research Projects Agency (ARPA), project VelaUNSPECIFIED
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Caltech Division of Geological Sciences1163
Issue or Number:5
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47851
Deposited By: George Porter
Deposited On:04 Aug 2014 14:40
Last Modified:03 Oct 2019 06:57

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