NDLI: Study of the Potential Earthquake Risk in the Western United States by the LURR Method Based on the Seismic Catalogue, Fault Geometry and Focal Mechanisms

Content Provider	Springer Nature Link
Author	Zhang, Yongxian Yikilmaz, M. Burak Rundle, John B. Yin, Xiangchu Liu, Yue Zhang, Langping Wang, Zijin
Copyright Year	2015
Abstract	Based on the load/unload response ratio (LURR) theory, spatial and temporal variation of Y/Y c (value of LURR/critical value of LURR under 90 % confidence) in the western United States and its adjacent area (31°–44°N, −128° to −112°E) during the period from 1980 to 2011 was studied. The selected study area was zoned into 20 sub-regions, in each of which the fault geometry and the focal mechanisms were very similar such that the stress fields were almost uniform. The loading and unloading periods were determined by calculating perturbations in the Coulomb failure stress in each sub-regions induced by earth tides. Earthquakes occurring in these sub-regions were identified as a loading or unloading type, and the response rate was chosen as the Benioff strain that can be calculated from earthquake magnitude M. With a time window of 1 year, a time moving step of 1 month, a space window of a circle region with a radius of 100 km, and a space moving step of 0.5° latitudinally and longitudinally, snapshots of the evolution of Y/Y c were generated. Scanning results show that obvious Y/Y c anomalies can be detected near the epicenter of all big earthquakes larger than M6.5 in regions with reasonable seismic monitoring abilities. They also show Y/Y c anomalies occurred several years prior to the big earthquakes and the lasting time of the anomaly is from one year to several years. For some LURR anomalous regions, however, no earthquakes occurred. According to the characteristics of LURR anomalies, two regions with a high risk of big earthquakes were detected. One is between the northern region of the Bay Area and the Mendocino triple junction (38°–40°N, −124° to −122°E) and the other is between Lake Tahoe and Mono Lake (37.5°–39.5°N, −120° to −118°E) along the border of California and Nevada.
Starting Page	2265
Ending Page	2276
Page Count	12
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	172
Issue Number	8
e-ISSN	14209136
Language	English
Publisher	Springer Basel
Publisher Date	2015-03-07
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LURR Y/Y c stress field spatial and temporal scanning western United States earthquake potential risk Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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