Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 1992; v. 82; no. 5; p. 2114-2125
© 1992 Seismological Society of America
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Background seismicity and strength of coupling in the subduction zones

S. K. SINGH, D. COMTE and M. PARDO

INSTITUTO DE GEOFÍSICA UNAM CIUDAD UNIVERSITARIA, 04510 Mexico, D.F.
UNIVERSIDAD DE CHILE DEPTO. DE GEOFÍSICA, CASILLA 2777, SANTIAGO, Chile

Abstract

The trend of background seismicity, Nn, in subduction zones is found to be related to the age of the plate at the trench, T, and the relative convergence speed, V, by Nn = a TbVc(b, c > 0). The scatter in the data, however, suggests that parameters other than T and V also influence the background seismicity. The number of aftershocks is weakly correlated with Nn. Since the background seismicity increases with both T and V whereas the maximum magnitude, MW, increases with V but decreases with T, no relationship exists between the strength of the coupling (as measured by MW) and the background seismicity.






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