Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316312w&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 16, CiteID L16312
Physics
19
Seismology: Earthquake Source Observations (1240), Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242), Seismology: Seismic Monitoring And Test-Ban Treaty Verification, Seismology: Earthquake Ground Motions And Engineering Seismology, Seismology: Seismic Instruments And Networks (0935, 3025)
Scientific paper
Pd is the peak amplitude of displacement in the first three seconds after the arrival of the P wave. We investigated the attenuation of Pd with the hypocentral distance R in southern California as a function of magnitude M, and obtained the following relationship: log (Pd) = -3.463 + 0.729 × M - 1.374 × log (R) +/- 0.305. Given an earthquake location determined by the P-wave arrival times at stations close to the epicenter, this relationship can be used to define a so-called ``Pd magnitude'' of earthquakes. Our result shows that for earthquakes in southern California the Pd magnitudes agree with the catalog magnitudes with a standard deviation of 0.18 for events less than magnitude 6.5. Therefore, Pd is a robust measurement for estimating the magnitudes of earthquakes and has practical application in earthquake early warning systems.
Wu Yih-Min
Zhao Li
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