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Modeling the long-period body waves from shallow earthquakes at regional ranges

Helmberger, D. V. and Engen, G. R. (1980) Modeling the long-period body waves from shallow earthquakes at regional ranges. Bulletin of the Seismological Society of America, 70 (5). pp. 1699-1714. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20140819-154914308

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Abstract

A procedure for modeling P and PL waves recorded on long-period WWSSN instruments at ranges 1° to 12° is presented. Following the experience gained by modeling explosions (Helmberger, 1972), we demonstrate that these long-period phases are adequately treated by a single crustal layer for most of Western United States. After generating the Green's functions at the various ranges for the three fundamental dislocation types, we need only construct linear combinations of these vectors to represent any arbitrary oriented earthquake. The waveform patterns produced from the various fault types are quite diagnostic with the dip-slip orientations showing a strong ringing nature which is caused by the vertical SV lobes. To test the usefulness of this technique, we construct synthetics for some well-studied west coast earthquakes where the orientation, time history, and moment have been determined independently. Comparing the predicted seismograms with observations, we find good agreement in waveshapes and amplitudes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://bssa.geoscienceworld.org/content/70/5/1699.abstractPublisherArticle
Additional Information:© 1980 Seismological Society of America. Manuscript received February 4, 1980. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force of Scientific Research under Contract F49620-77-C-0022.
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F49620-C-0022
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3393
Issue or Number:5
Record Number:CaltechAUTHORS:20140819-154914308
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140819-154914308
Official Citation:Helmberger, D. V., & Engen, G. R. (1980). Modeling the long-period body waves from shallow earthquakes at regional ranges. Bulletin of the Seismological Society of America, 70(5), 1699-1714.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48699
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:20 Aug 2014 22:44
Last Modified:03 Oct 2019 07:06

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