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Definition of Seismic Moment at a Discontinuity Interface

Center for Earth System Science
Graduate School of the Chinese Academy of Sciences
No. 19A, Yuquan Road
Beijing 100039, China
wuzhl{at}gscas.ac.cnz
(Z.L.W.)
Institute of Geophysics
China Seismological Bureau
No. 5, Minzudaxuenan Road
Beijing 100081, China
chenyt{at}cdsn.org.cn
(Z.L.W., Y.T.C.)

Manuscript received 20 November 2002.

When considering a seismic source operating along a discontinuity interface, seismic moment has to be redefined considering the jump of rigidity. The traditional definition of seismic moment may lead to underestimation of the slip or rupture length of an earthquake. Redefined seismic moment can be represented as M₀ = µ^* uA, in which µ^*, the effective rigidity, can be represented by the average rigidity and the difference of rigidity across the interface µ via .

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