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Deep structure of the Racha earthquake source zone from seismic tomography data

Authors
  • Arefiev, S. S.1
  • Rogozhin, E. A.1
  • Bykova, V. V.1
  • Dorbath, C.2
  • 1 Russian Academy of Sciences, Schmidt Institute of Physics of the Earth, Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia , Moscow (Russia)
  • 2 Institut de Recherche pour le Dévelopment, École et Observatoire des Sciences de la Terre, Strasbourg, France , Strasbourg (France)
Type
Published Article
Journal
Izvestiya, Physics of the Solid Earth
Publisher
Nauka/Interperiodica
Publication Date
Jan 01, 2006
Volume
42
Issue
1
Pages
27–40
Identifiers
DOI: 10.1134/S1069351306010034
Source
Springer Nature
Keywords
License
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Abstract

The Racha earthquake of 1991 was the strongest of the earthquakes recorded in the Caucasus. It was studied by an international epicentral expedition. Unique data gathered by this expedition included records of aftershocks whose swarm was very intense. A 3-D velocity model is obtained from analysis of these data by the method of local earthquake tomography. The ancient crystalline basement and the sedimentary-volcanic Mesozoic-Cenozoic cover could be identified from cross sections of the P wave field. The eastern and western boundaries of an uplift in the basement of the Dzirulskii Massif are delineated. Linear low velocity heterogeneities correlating with the active Kakheti-Lechkhumi fault zone and two Trans-Caucasian linear fault zones are discovered in the basement. The cloud of aftershock hypocenters is shown to correlate with a reflector coinciding with the cover-basement interface.

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