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Real-time testing of the on-site warning algorithm in southern California and its performance during the July 29 2008 M_w5.4 Chino Hills earthquake

Böse, M. and Hauksson, E. and Solanki, K. and Kanamori, H. and Heaton, T. H. (2009) Real-time testing of the on-site warning algorithm in southern California and its performance during the July 29 2008 M_w5.4 Chino Hills earthquake. Geophysical Research Letters, 36 (3). Art. No. L00B03. ISSN 0094-8276. doi:10.1029/2008GL036366.

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The real-time performance of the τ_c -P_d on-site early warning algorithm currently is being tested within the California Integrated Seismic Network (CISN). Since January 2007, the algorithm has detected 58 local earthquakes in southern California and Baja with moment magnitudes of 3.0 ≤ M_w ≤ 5.4. Combined with newly derived station corrections the algorithm allowed for rapid determination of moment magnitudes and Modified Mercalli Intensity (MMI) with uncertainties of ±0.5 and ±0.7 units, respectively. The majority of reporting delays ranged from 9 to 16 s. The largest event, the July 29 2008 M_w5.4 Chino Hills earthquake, triggered a total of 60 CISN stations in epicentral distances of up to 250 km. Magnitude predictions at these stations ranged from M_w4.4 to M_w6.5 with a median of M_w5.6. The closest station would have provided up to 6 s warning at Los Angeles City Hall, located 50 km to the west-northwest of Chino Hills.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hauksson, E.0000-0002-6834-5051
Kanamori, H.0000-0001-8219-9428
Heaton, T. H.0000-0003-3363-2197
Additional Information:© 2009 American Geophysical Union. Received 17 October 2008; accepted 10 December 2008; published 5 February 2009. We thank two anonymous reviewers for their positive comments on an earlier version of our manuscript. This work is funded through contract 06HQAG0149 from USGS/ANSS to the California Institute of Technology (Caltech). The Southern California Seismic Network (SCSN) and the Southern California Earthquake Data Center (SCEDC) are funded through contracts with USGS/ANSS, the California Office of Emergency Services (OES), and the Southern California Earthquake Center (SCEC). This is contribution 10010 of the Seismological Laboratory, Geological and Planetary Sciences at Caltech.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
California Office of Emergency ServicesUNSPECIFIED
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:earthquake early warning; Chino Hills; California
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Caltech Division of Geological and Planetary Sciences10010
Issue or Number:3
Record Number:CaltechAUTHORS:20090807-113700227
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14869
Deposited By: Ruth Sustaita
Deposited On:01 Sep 2009 23:03
Last Modified:08 Nov 2021 23:14

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