HR: 1340h
AN: T13E-1628    [Abstracts]
TI: Seismicity of the Stanovoi Volcanic Field Region, Eastern Russia
AU: * Moyer, P A
EM: moyerpam@msu.edu
AF: Department of Geological Sciences, Michigan State University, East Lansing, MI 48824- 1115, United States
AU: Mackey, K G
EM: mackeyke@msu.edu
AF: Department of Geological Sciences, Michigan State University, East Lansing, MI 48824- 1115, United States
AU: Fujita, K
EM: fujita@msu.edu
AF: Department of Geological Sciences, Michigan State University, East Lansing, MI 48824- 1115, United States
AU: Shibaev, S V
EM: shibaev@emsd.ysn.ru
AF: Yakutsk Filial, Geophysical Survey, Siberian Branch, Russian Academy of Sciences, 39 Prospekt Lenina, Yakutsk, 677982, Russian Federation
AU: Gounbina, L V
EM: memsd@mail.ru
AF: Magadan Filial, Geophysical Survey, Russian Academy of Sciences, Skuridina 6b, Magadan, 685000, Russian Federation
AB: The Stanovoi region of southern Yakutia is one of the most poorly understood seismically active regions in eastern Russia. Although a considerable number of earthquakes have been located in the region, the epicenters are likely poor as only distant stations were used in the locations. In addition, the active faults, type of faulting, and levels of microseismicity in the region were unknown. Within the Stanovoi region is a province of Cenozoic basaltic volcanism (0.5-1.0 Ma) that is near a cluster of previously located earthquakes. Up to now, it was unknown if the seismicity in the region had any connection to the volcanic field or to large faults visible in the satellite images and topography of the region. The proposed extension of the Tanlu fault into Russia from China may also terminate near the study area. We conducted a temporary deployment of five broadband seismic stations encircling the Stanovoi volcanic field. We also observed clear young fault scarps interpreted as southward-plunging low angle thrusts. Our seismicity results indicate that the volcanic field proper is aseismic while surrounding areas are very active. Combined analysis of seismicity and observed scarps and geomorphic features indicate that the Stanovoi region may be underlain by large, active thrust faults, which are generally consistent with north-northeastward movement of the Amur block into the Eurasian plate.
DE: 7270 Tomography (6982, 8180)
DE: 8107 Continental neotectonics (8002)
DE: 8108 Continental tectonics: compressional
DE: 8158 Plate motions: present and recent (3040)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting