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Dimensions of the Source Region for Small Shallow Earthquakes

Press, Frank (1965) Dimensions of the Source Region for Small Shallow Earthquakes. In: Proceedings of the VESIAC Conference on the Current Status and Future Prognosis for Understanding the Source Mechanism of Shallow Seismic Events in the 3 to 5 Magnitude Range. No. . University of Michigan , Ann Arbor, MI, pp. 155-163. ISBN 2661246. http://resolver.caltech.edu/CaltechAUTHORS:20130124-105958368

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Abstract

The dimensions of the source of small-magnitude earthquakes can be inferred from: (1) Spectrum as a function of magnitude (2) Fault length as a function of magnitude (3) Dimension of explosion sources having the same magnitude and spectrum (4) Strain-energy considerations. Available data are reviewed and interpreted to obtain very rough indications of the source dimension for small- magnitude earthquakes. A magnitude 4 earthquake may have a source dimension between 1/10 and 1 km. Tocher's hypothesis on a plastic zone within the crust is modified to place the zone in the upper-mantle low-velocity, low-Q region. With this change, energy release from large earthquakes would vary with the horizontal area of the source region. Small earthquakes would release energy proportional to the volume of the source region.


Item Type:Book Section
Additional Information:© 1965 University of Michigan. Contribution 1324, Division of Geological Sciences, California Institute of Technology, Pasadena. This research was supported by the Advanced Research Projects Agency and was monitored by the Air Force Office of Scientific Research under Contract AF 49(638)-1337.
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)49(638)-1337
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Caltech Division of Geological Sciences1324
Record Number:CaltechAUTHORS:20130124-105958368
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130124-105958368
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36567
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Mar 2013 22:59
Last Modified:04 Mar 2013 22:59

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