Тип публикации: статья из журнала
Год издания: 2015
Идентификатор DOI: 10.1007/s10950-014-9469-5
Ключевые слова: Active faults, Andrei-Tas block, Chersky seismotectonic zone, Dynamics of seismotectonic processes, Focal mechanism, Ilin-Tas (Abyi) earthquake, Isoseisms, Kolyma-Omolon indentor, Yana-Indigirka segment
Аннотация: The paper presents the results of analysis of tectonics, modern relief morphology, active faults, and types of Cenozoic deformations in the epicentral area of the Ilin-Tas (Ms = 6.9) earthquake, one of the strongest events registered at the boundary of the Eurasian and North American lithospheric plates in northeast Russia. GeologiПоказать полностьюcal, tectonic, and geophysical characteristics of the Yana-Indigirka segment of the Chersky seismotectonic zone are studied. The methods of investigation were elaborated at the Institute of the Earth’s Physics, RAS (Moscow), and were adapted to conducting seismotectonic work on the territory of northeast Russia. The results of instrumental observations are summarized, and manifestations of strong seismic events are discussed. Description is given of the structural–tectonic setting in which the Andrei-Tas seismic maximum developed. It originated under the effect of the Kolyma-Omolon terrane (indentor) which “intruded” into the Chersky seismotectonic zone on the side of the North American plate, thus leading to the formation of major seismoactive structures in the frontal Ilin-Tas folded zone. The indentor moved in NE-SW direction, which is consistent with the orientation of the major axis of isoseism ellipses (azimuth 50–85°) constructed from observation of macroseismic effects of the Uyandina (Ms = 5.6), Andrei-Tas (Ms = 6.1), and Ilin-Tas (Ms = 6.9) earthquakes. © 2014, The Author(s).
Журнал: Journal of Seismology
Выпуск журнала: Vol. 19, Is. 2
Номера страниц: 341-353