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Russian Geology and Geophysics

2005 year, number 7

LARGE EARTHQUAKES IN THE BAIKAL REGION AND MONGOLIA: RECURRENCE TIME AND PROBABILITY

A.V. Klyuchevskii, V.M. Dem'yanovich, and G. Bayar*
Institute of the Earth's Crust, Siberian Branch of the RAS,
128 ul. Lermontova, Irkutsk, 664033, Russia
* Research Center of Astronomy and Geophysics,
Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
Keywords: Large earthquakes, energy class, magnitude, recurrence time, probability, Baikal region, Mongolia
Pages: 731-745

Abstract

Recurrence time and probability for large and great earthquakes in the Baikal region and Mongolia were estimated within the limits of an inhomogeneous faulting model using the maximum entropy principle and assuming Poisson distribution of events. The predicted recurrence times of KP = 18 earthquakes are 220 years for the Baikal region, 370, 470, and 430 years for the southwestern, central, and northeastern subregions, and 210 years for Mongolia, if the maximum energy of characteristic events is taken as KP max = 19. At KP max = 19, the events that may occur in the future 50 years within these territories to a 10% probability are expected to release the energies corresponding to classes 18.39, 18.15, 18.00, 18.06, and 18.42; the estimated probabilities ( P ) for KP = 18.0 events within 50 years are 0.20, 0.13, 0.10, 0.11, and 0.21, respectively.