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Microfractures, aftershocks, and seismicity

Scholz, C. H. (1968) Microfractures, aftershocks, and seismicity. Bulletin of the Seismological Society of America, 58 (3). pp. 1117-1130. ISSN 0037-1106.

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Laboratory investigation of microfracturing in brittle rock has revealed that microfracturing events can be detected after brittle fracture of rock in compression, provided the specimen remains intact. If the sample is isolated after fracture, microfracturing activity decays hyperbolically in a manner similar to typical earthquake aftershock sequences. If reloaded, the sequence is disturbed and a cumulative aftershock pattern develops which is similar to that described by Benioff as strain release due to shear creep. These two types of sequences are discussed with respect to a Markovian model of time dependent fracture in an inhomogeneous brittle medium. This model is then expanded to apply to earthquake aftershock sequences. According to this theory aftershocks are produced by creep rupture due to stress corrosion in the regions of stress concentration following the main shock. The conclusions from laboratory investigations of microfracturing are summarized with respect to the implications regarding the sequence of earthquakes.

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Additional Information:Copyright © 1968, by the Seismological Society of America. Manuscript received January 29, 1968. The experimental work reported in this paper was supported by NSF grant GA-613x and by grant 19(628)-3298 of the Office of Aerospace Research, Air Force Cambridge Research Laboratories. The paper was written while the author was supported by NSF grant GA 1087. I would like to thank W. F. Brace and J. B. Walsh for helpful discussions of the experimental results and James Brune, Stewart Smith, and Charles Archambeau for critically evaluating the manuscript.
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Air Force Cambridge Research Laboratories19(628)-3298
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Division of Geological Sciences1512
Issue or Number:3
Record Number:CaltechAUTHORS:20140808-162023261
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48269
Deposited By: George Porter
Deposited On:11 Aug 2014 14:07
Last Modified:03 Oct 2019 07:02

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