Magnitude scaling relations from P-waves in southern California
Article first published online: 5 OCT 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 19, October 2007
How to Cite
2007), Magnitude scaling relations from P-waves in southern California, Geophys. Res. Lett., 34, L19304, doi:10.1029/2007GL031077., , and (
- Issue published online: 5 OCT 2007
- Article first published online: 5 OCT 2007
- Manuscript Accepted: 22 AUG 2007
- Manuscript Revised: 10 AUG 2007
- Manuscript Received: 21 JUN 2007
- magnitude estimation;
- earthquake early warning
 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 (τpmax) and the peak displacement amplitude (Pd) measured from the first 4 seconds of P-wave arrivals to determine period-magnitude 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 (M < = 4.5), 0.3 magnitude units for events with magnitudes ranging from 4.5 to 6.5 (4.5 < M < = 6.5), and 0.5 magnitude units for events with magnitudes greater than 6.5 (M > 6.5).