Geological and macroseismic effects of the Muya, 1957 earthquake and palaeoearthquakes in Baikal region |
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Authors: | R E Tatevossian N G Mokrushina A N Ovsyuchenko T N Tatevossian |
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Affiliation: | (1) Institute of Physics of the Earth, Russian Academy of Sciences, ul. B. Gruzinskaya 10, 123995 Moscow, Russia;(2) Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano-Pavia, Via E. Bassini 15, 20133 Milan, Italy |
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Abstract: | Intensity of the Muya, 1957 earthquake is assessed in localities based on macroseismic data and in epicentral area based on
effects in natural environment; it is analyzed how these assessments correspond to each other and to instrumental location
of epicenter, hypocentral depth, and magnitude; it is evaluated, how seismodislocations of the Muya earthquake could serve
as control of palaeoseismostructure parameters in this region. Spatial distribution of macroseismic effect confirms relatively
deep source (20–22 km). Deep source agrees with anomalously short surface rupture length (not more than 25 km); only a part
of the source exposed on the surface. Comparison with length of palaeoseismostructures shows that it is a regional feature.
Epicentral intensity based on surface ruptures is assed X degrees in ESI2007 scale. Ignoring geological effects will underestimate
epicentral intensity up to two degrees. Source mechanism with three sub-sources is in agreement with segmentation of surface
ruptures. Sub-sources are of strike-slip type with small normal component; essential normal slip at surface is probably not
representative for the source and is due to accommodation of strike-slip movement along with a system of sub-parallel en echelon
ruptures under tension. |
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