The seismic efficiency of the 1999 Chi-Chi, Taiwan, earthquake

Details The seismic efficiency of the 1999 Chi-Chi, Taiwan, earthquake The seismic efficiency of the 1999 Chi-Chi, Taiwan, earthquake

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110613w&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 10, CiteID L10613

Physics

3

Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters, Seismology: Seismic Hazard Assessment And Prediction

Scientific paper

On September 20, 1999, the Ms7.6 Chi-Chi earthquake ruptured the Chelungpu fault in central Taiwan. In this work, the seismic efficiency, η, which is the ratio of seismic radiation energy, ES, to strained energy, ΔE, of the earthquake is estimated. The value of ΔE estimated from the slip distribution inferred by Dominguez et al. [2003] is 3.208 × 1024 ergs. Based on this value, the η calculated from ES, measured from near-field seismograms and from near-field and teleseismic data are 0.137 and 0.262, respectively. The two values do not seem to agree with the η $\leqq$ 0.06 hypothesis proposed by McGarr [1994]. From the ES calculated from two ES-Ms laws, η = 0.049 and 0.019, which fit the hypothesis. However, the two laws could underestimate ES.

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