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Magnitude scaling relations from P‐waves in southern California
Author(s) -
Tsang Louisa L. H.,
Allen Richard M.,
Wurman Gilead
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031077
Subject(s) - magnitude (astronomy) , amplitude , scaling , richter magnitude scale , geodesy , earthquake magnitude , geology , seismology , physics , mathematics , geometry , astrophysics , optics
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 ( τ p max ) and the peak displacement amplitude (P d ) 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).