A geological study of the epicentral area of the April 20(21), 2006 Olyutorskii earthquake |
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Authors: | E A Rogozhin A N Ovsyuchenko A V Marakhanov S S Novikov |
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Affiliation: | 1.Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Primary and secondary earthquake effects were investigated (surface breakage and felt effects in the villages of Tilichiki,
Korf, and Khailino) in the epicentral area of a large earthquake occurring in northern Kamchatka Krai. The primary effects
include an extended surface break that can be followed for a length of about 140 km. The secondary (gravitational and vibrational)
effects include soil slides and minor rockfalls, snow flows on slopes, resonant cracks, soil liquefaction phenomena consisting
of mud cones, mud gryphons, and discharges of soil from cracks. Detailed maps showing the main types of earthquake surface
effects have been made. Paleoseismic data show traces of several large earthquakes that have occurred in the Olyutorskii earthquake
zone. Radio carbon dating of soil samples from these paleoseismic scarps revealed a history of great earthquakes occurring
in Koryakia. In all, four seismic events with magnitudes about that of the 2006 Olyutorskii earthquake have occurred there
during 8000 years, the return period of such events being 1000–2500 years. |
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