Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3902309l&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 2, CiteID L02309
Physics
Seismology: Earthquake Ground Motions And Engineering Seismology (4302), Seismology: Earthquake Source Observations (1240), Seismology: Seismic Monitoring And Test-Ban Treaty Verification
Scientific paper
An instantaneous measure of the moment magnitude (Mw) of an ongoing earthquake is estimated from the moment rate function (MRF) determined in real-time from available seismic data using waveform inversion. Integration of the MRF gives the moment function from which an instantaneous Mw is derived. By repeating the inversion procedure at regular intervals while seismic data are coming in we can monitor the evolution of seismic moment and Mw with time. The final size and duration of a strong earthquake can be obtained within 12 to 15 minutes after the origin time. We show examples of Mw monitoring for three large earthquakes at regional distances. The estimated Mw is only weakly sensitive to changes in the assumed source parameters. Depending on the availability of seismic stations close to the epicenter, a rapid estimation of the Mw as a prerequisite for the assessment of earthquake damage potential appears to be feasible.
Friederich Wolfgang
Lee Julian
Meier Teresa
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