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Simulating a large Wasatch Front, Utah, earthquake using small earthquake recordings as Green's functions

Author: Janet C Johnston; U.S. Air Force Geophysics Laboratory. Earth Sciences Division.
Publisher: Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1986.
Series: AFGL-TR, 86-0120.; Environmental research papers (Hanscom AFB, Mass.), no. 956.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
Several earthquake recordings at Golden, Colorado in the magnitude ranges 4-6, were digitized and were used to investigate the feasibility of adding them together to simulate a larger earthquake (magnitude 7.0-7.5). The test path of the Wasatch Front, Utah, to the WWSSN station at Golden was selected (distance = 400 - 500 km). The hypothetical causative fault was given dimensions on the order of 45 km long by 20 km  Read more...
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Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Janet C Johnston; U.S. Air Force Geophysics Laboratory. Earth Sciences Division.
OCLC Number: 15289723
Notes: Cover title.
Distributed to depository libraries in microfiche.
"28 May 1986."
"Earth Sciences Division Project 7600."
Description: vii, 51 pages : illustrations, maps ; 28 cm.
Series Title: AFGL-TR, 86-0120.; Environmental research papers (Hanscom AFB, Mass.), no. 956.
Other Titles: Technical Report Archive & Image Library (TRAIL)
Responsibility: Janet C. Johnston.

Abstract:

Several earthquake recordings at Golden, Colorado in the magnitude ranges 4-6, were digitized and were used to investigate the feasibility of adding them together to simulate a larger earthquake (magnitude 7.0-7.5). The test path of the Wasatch Front, Utah, to the WWSSN station at Golden was selected (distance = 400 - 500 km). The hypothetical causative fault was given dimensions on the order of 45 km long by 20 km wide and was divided into 'cells, ' representative in size to the 'seed' events rupture dimensions and with other variations. The results were evaluated by total energy and amplitude criteria. The final waveforms were judged to be adequate predictions at the lower frequency end of the spectra. The high frequency content was controlled by the spectra of the seed earthquakes whose magnitudes were too large to adequately reproduce the Green's function response at these frequencies. It is recommended that this technique be used at smaller distance ranges or at stations whose sensitivity is set high enough so as to record the smaller magnitude earthquakes, more representative of impulse responses at all frequencies. Keywords: Seismic waves; Seismic data; Synthetic waveforms; Green's function addition; Wasatch front earthquake; Seismic hazard; Earthquake prediction.

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