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Comparison of source scaling relations of eastern and western North American earthquakes

Somerville, P. G. and McLaren, J. P. and LeFevre, L. V. and Burger, R. W. and Helmberger, D. V. (1987) Comparison of source scaling relations of eastern and western North American earthquakes. Bulletin of the Seismological Society of America, 77 (2). pp. 322-346. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20140902-134502150

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Abstract

Source scaling relations have been obtained for earthquakes in eastern North America and other continental interiors, and compared with a relation obtained for earthquakes in western North America. The scaling relation for eastern North American earthquakes was constructed from measurements of seismic moment and source duration obtained by the waveform modeling of seismic body waves. The events used include nine events of m_(bLg) magnitude 4.7 to 5.8 that occurred after 1960, and four earlier events with magnitudes between 5.5 and 6.6. The scaling relation for events in other continental interiors was used for comparative purposes and to provide constraints for large magnitudes. Detailed analysis of the uncertainties in the scaling relations has allowed the resolution of two important issues concerning the source scaling of earthquakes in eastern North America. First, the source characteristics of earthquakes in eastern North America and other continental interiors are consistent with constant stress drop scaling, and are inconsistent with nonconstant scaling models such as that of Nuttli (1983). Second, the stress drops of earthquakes in eastern North America and other continental interiors are not significantly different from those of earthquakes in western North America, and have median values of approximately 100 bars. The source parameters of earthquakes in eastern North America are consistent with a single constant stress drop scaling relation, whereas the source parameters of earthquakes in western North America are much more variable and show significant departures from an average scaling relation in which stress drop decreases slightly with seismic moment.


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Additional Information:© 1987, by the Seismological Society of America. Manuscript received 25 February 1986. The authors are greatly indebted to several individuals who provided seismograms for analysis in this study. Dr. Alan Douglas and Peter Marshall of the United Kingdom Atomic Energy Authority provided digital seismograms from the UKAEA array stations. Robert Halliday and William Shannon loaned film seismograms and provided copies of seismograms from the Canadian Seismograph Network. Barbara Rubin of Teledyne-Geotech provided digital seismograms from the LRSM and SDCS Networks. Dr. Derek York provided a copy of his least-squares fitting program, and Dr. Ram Kulkarni provided guidance in the statistical analyses. A stimulating review of the work was provided by Dr. Jeffrey Barker. This study was sponsored by the Electric Power Research Institute. The research topic was suggested by Dr. J. Carl Stepp, and the research program was managed by Dr. Jerry King.
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Electric Power Research InstituteUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20140902-134502150
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140902-134502150
Official Citation: P. G. Somerville, J. P. McLaren, L. V. LeFevre, R. W. Burger, and D. V. Helmberger Comparison of source scaling relations of eastern and western North American earthquakes Bulletin of the Seismological Society of America, April 1987, v. 77, p. 322-346
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49128
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:02 Sep 2014 22:21
Last Modified:03 Oct 2019 07:10

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