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Compression directions north of the San Fernando Valley determined from borehole breakouts

Kerkela, Stacy and Stock, Joann M. (1996) Compression directions north of the San Fernando Valley determined from borehole breakouts. Geophysical Research Letters, 23 (23). pp. 3365-3368. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20140414-132129630

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Abstract

Borehole breakouts in 4 nearly vertical oil wells, and several other deviated holes, in the San Fernando Valley and Santa Susana Mountains suggest a maximum horizontal compressive stress direction (S_H) of N49°W. These wells provide information about the stress field from 1974 to 1983 in the uppermost crust (<3 km depth) near the aftershock zones of the January 1994 Northridge earthquake and the February 1971 Sylmar earthquake. This direction of S_H is anomalous with respect to the N to NNE directions of S_H seen in other regional data, but is consistent with the structural complexity of this zone, including local changes in strike of major thrust fault zones and the presence of lateral ramps in both the Santa Susana and San Fernando faults.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/96GL03054DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/96GL03054/abstractPublisherArticle
ORCID:
AuthorORCID
Stock, Joann M.0000-0003-4816-7865
Additional Information:© 1996 American Geophysical Union. Manuscript Accepted: 29 Aug 1996. Manuscript Received: 11 Jul 1995. Paper number 96GL03054. We thank the Southern California Gas Company for providing access to some of the data. This study was funded by Caltech SURF (Summer Undergraduate Research Fellowship) program and by the Southern California Earthquake Center (NSF Grant EAR-89-20136). We thank Colleen Barton, Mike Bruno, and Bob Yeats for very helpful reviews of this paper. SCEC Publication number 342. Contribution Number 5577, Caltech Seismological Laboratory.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Caltech SURF programUNSPECIFIED
Southern California Earthquake CenterUNSPECIFIED
NSFEAR 89-20136
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center342
Caltech Seismological Laboratory5577
Record Number:CaltechAUTHORS:20140414-132129630
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140414-132129630
Official Citation:Compression directions north of the San Fernando Valley determined from borehole breakouts (pages 3365–3368) Stacy Kerkela and Joann M. Stock DOI: 10.1029/96GL03054
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44932
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Apr 2014 20:55
Last Modified:04 Dec 2015 19:12

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