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Bulletin of the Seismological Society of America; June 1989; v. 79; no. 3; p. 645-654
© 1989 Seismological Society of America
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Estimation of earthquake hazard parameters from incomplete data files. Part I. Utilization of extreme and complete catalogs with different threshold magnitudes

A. KIJKO and M. A. SELLEVOLL

INSTITUTE OF GEOPHYSICS POLISH ACADEMY OF SCIENCES, KS. JANUSZA 64, 01-452 WARSAW, Poland
SEISMOLOGICAL OBSERVATORY UNIVERSITY OF BERGEN, 5007 BERGEN, Norway

Abstract

The maximum likelihood estimation of earthquake hazard parameters (maximum regional magnitude, mmax, earthquake activity rate {lambda}, and b parameter in the Gutenberg-Richter equation) is extended to the case of mixed data containing large historical events and recent complete observations. The method accepts variable quality of complete data in different parts of a catalog with different threshold magnitude values. As an illustration, the procedure is applied for the estimation of seismicity parameters in the area of Calabria and eastern Sicily.




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