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Array analysis of the ground velocities and accelerations from the 1971 San Fernando, California, earthquake

Liu, Hsui-Lin and Heaton, Thomas (1984) Array analysis of the ground velocities and accelerations from the 1971 San Fernando, California, earthquake. Bulletin of the Seismological Society of America, 74 (5). pp. 1951-1968. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20130228-101520253

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Abstract

Profiles of ground velocity and acceleration, displayed as a function of epicentral distance, are analyzed for recordings of the 1971 San Fernando earthquake. Three long profiles (>50 km) and three short profiles (<2 km) are studied. Although there is considerable variation in waveforms and peak amplitudes observed along the long profiles, there are also many examples of coherent phases seen on adjacent stations. There are striking differences in the amplitudes and durations of ground velocity observed at stations located on hard rock sites as opposed to stations located within the large sedimentary basins of the Los Angeles area. Furthermore, the San Fernando Basin, which is adjacent to the source area, seems to respond quite differently from the Los Angeles Basin which is about 30 km from the earthquake source area. Ground acceleration profiles, however, show that there is no corresponding change in the duration or amplitude of high-frequency shaking with site characteristics. We infer that the excitation of surface waves within sedimentary basins is the reason that large peak velocities and displacements are observed for soft sites. The ground velocity waveforms are nearly identical along the three short profiles, which are all located within the Los Angeles Basin. Greater variation of waveforms and amplitudes are seen for ground acceleration along these short profiles, although strong phase coherence is still observed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://bssa.geoscienceworld.org/content/74/5/1951PublisherArticle
ORCID:
AuthorORCID
Heaton, Thomas0000-0003-3363-2197
Additional Information:© 1984 Seismological Society of America. Manuscript received 22 December 1983. This research was supported by the National Science Foundation Grant CEE81-21719.
Funders:
Funding AgencyGrant Number
NSFCEE81-21719
Issue or Number:5
Record Number:CaltechAUTHORS:20130228-101520253
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130228-101520253
Official Citation: Hsui-Lin Liu and Thomas Heaton Array analysis of the ground velocities and accelerations from the 1971 San Fernando, California, earthquake Bulletin of the Seismological Society of America, October 1984, v. 74, p. 1951-1968
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37197
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Feb 2013 20:39
Last Modified:03 Oct 2019 04:45

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