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Peak acceleration scaling studies

Hadley, David M. and Helmberger, Donald V. and Orcutt, John A. (1982) Peak acceleration scaling studies. Bulletin of the Seismological Society of America, 72 (3). pp. 959-979. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20140903-082810865

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Abstract

An acceleration time history can be decomposed into a series of operations that transfers energy from each point on the fault to the recording station ACC(t) = S * R * E * Q where S is the source time function, R represents rupture over a finite fault, E is the elastic propagation through the earth, and Q is the path attenuation, assumed to be linear. If these operators were exactly known, a deterministic approach to predicting strong ground motions would be straightforward. For the current study, E was computed from a velocity model that incorporates a stiff sedimentary layer over a southern California crust. A range of realistic rupture velocities have been obtained by other investigators and is incorporated into the simulation. Assumptions of the path averaged attenuation, Q, can be tested by comparing with observational data, as a function of distance, the parameters peak acceleration, and computed M_L. This provides a check on both the high frequency (∼ 5 Hz) and long-period (∼ 1 sec) behavior of E^* Q. An average curstal shear wave Q_β of 300 is found to be compatible with observational data (M_L = 4.5 to 5.0). Assumptions of S can be avoided by using real sources derived from accelerograms recorded at small epicentral distances (epicentral distance/source depth < 1). Using these operators, accelerograms have been simulated for strike-slip faulting for four magnitudes: 4.5; 5.5; 6.5; and 7.0. The shapes of the derived average peak ground acceleration (PGA) versus distance curves are well described by the simple equation PGA α [R + C(M)]^(−1.75), where R is the closest distance to the fault surface and C(4.5) = 6, C(5.5) = 12, C(6.5) = 22, and C(7.0) = 36 km.


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Additional Information:© 1982, by the Seismological Society of America. Manuscript received 31 March 1981. The authors thank an anonymous reviewer for comments that improved the manuscript. This research was supported by the U.S. Geological Survey under Contract 14-08-0001-19131, 14-08-0001-19835, and by Southern California Edison. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.
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Funding AgencyGrant Number
USGS14-08-0001-19131
USGS14-08-0001-19835
Southern California EdisonUNSPECIFIED
Record Number:CaltechAUTHORS:20140903-082810865
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140903-082810865
Official Citation:David M. Hadley, Donald V. Helmberger, and John A. Orcutt Peak acceleration scaling studies Bulletin of the Seismological Society of America, June 1982, v. 72, p. 959-979
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49173
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Sep 2014 15:52
Last Modified:03 Sep 2014 16:03

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