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AGU: Geophysical Research Letters

 

Keywords

  • earthquake early warning
  • Chino Hills
  • California

Index Terms

  • Seismology: Seismic instruments and networks
  • Seismology: Seismic monitoring and test-ban treaty verification
  • Seismology: Earthquake ground motions and engineering seismology
  • Seismology: Earthquake source observations
  • Computational Geophysics: Instruments and techniques

Abstract

Real-time testing of the on-site warning algorithm in southern California and its performance during the July 29 2008 Mw5.4 Chino Hills earthquake

M. Böse

Seismological Laboratory, California Institute of Technology, Pasadena, California, USA

E. Hauksson

Seismological Laboratory, California Institute of Technology, Pasadena, California, USA

K. Solanki

Seismological Laboratory, California Institute of Technology, Pasadena, California, USA

H. Kanamori

Seismological Laboratory, California Institute of Technology, Pasadena, California, USA

T. H. Heaton

Seismological Laboratory, California Institute of Technology, Pasadena, California, USA

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 ≤ Mw ≤ 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 Mw5.4 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 Mw4.4 to Mw6.5 with a median of Mw5.6. 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.

Received 17 October 2008; accepted 10 December 2008; published 5 February 2009.

Citation: Böse, M., E. Hauksson, K. Solanki, H. Kanamori, and T. H. Heaton (2009), Real-time testing of the on-site warning algorithm in southern California and its performance during the July 29 2008 Mw5.4 Chino Hills earthquake, Geophys. Res. Lett., 36, L00B03, doi:10.1029/2008GL036366.

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