Magnitude scaling relations from P-waves in southern California

Louisa Tsang
Richard M. Allen
Gilead Wurman
University of California, Berkeley

Geophys. Res. Lett., 34 L19304, doi:10.1029/2007GL031077, 2007.

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Abstract
We derive empirical magnitude scaling relationships for southern California using a dataset of 59 past earthquakes recorded in southern California by the Southern California Seismic Network (SCSN) between 1992 and 2003. The events range in magnitude from 3.0 to 7.3. We use the maximum predominant period (tau-p-max) and the peak displacement amplitude (Pd) measured from the first 4 seconds of P-wave arrivals to determine periodmagnitude and amplitude-magnitude scaling relationships respectively. Our calibration study shows that the scaling relationships are similar to those derived for northern California. The average error in magnitude estimates is 0.2 magnitude units for events with magnitudes smaller than 4.5, 0.3 magnitude units for events with magnitudes ranging from 4.5 to 6.5, and 0.5 magnitude units for events with magnitudes greater than 6.5.

© Richard M Allen