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Estimating seismic moment magnitude Mw of tremor bursts in northern Cascadia; implications for the seismic efficiency of episodic tremor and slip



Estimating seismic moment magnitude Mw of tremor bursts in northern Cascadia; implications for the seismic efficiency of episodic tremor and slip



Geophysical Research Letters 37.19



We develop a method to estimate the seismic moments of deep non-volcanic tremor bursts observed in northern Cascadia. For each tremor burst, the maximum amplitudes at individual stations within a time window + or -5 s around the predicted arrivals of the S phase are measured and compared to the maximum S amplitudes measured from synthetic seismograms. The proposed method is thoroughly calibrated using 464 local earthquakes and the results show excellent consistency between the reported M(L) and the estimated M(w) . We apply the method to northern Cascadia tremors and infer that most bursts have M(w) approximately 1.0-1.7. The corresponding b value appears to be 1, consistent with that of ordinary earthquakes but over a narrower M(w) range. Comparison of cumulative tremor M(w) and the M(w) estimated from the accompanying slow slip suggests that the "seismic efficiency" of the Episodic Tremor and Slip (ETS) is of the order of 0.1% or less.

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Accession: 037045670

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DOI: 10.1029/2010gl044927


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