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Summary: 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. Bo¨se,1
E. Hauksson,1
K. Solanki,1
H. Kanamori,1
and T. H. Heaton1
Received 17 October 2008; revised 26 November 2008; accepted 10 December 2008; published 5 February 2009.
[1] The real-time performance of the tc-Pd 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
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