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| Titel |
Seismotectonics of the Chersky Seismic Belt, eastern Sakha Republic (Yakutia) and Magadan District, Russia |
| VerfasserIn |
K. Fujita, B. M. Koz'min, K. G. Mackey, S. A. Riegel, M. S. McLean, V. S. Imaev |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1868-4556
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| Digitales Dokument |
URL |
| Erschienen |
In: Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov ; Nr. 4 (2009-09-17), S.117-145 |
| Datensatznummer |
250001444
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| Publikation (Nr.) |
 copernicus.org/smsps-4-117-2009.pdf |
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| Zusammenfassung |
The Chersky seismic belt represents a zone of deformation between the North
American and Eurasian plates in northeast Russia. The belt extends from the
Laptev Sea into the Chersky Range where it splits into two branches. One
branch extends to Kamchatka and the Aleutian-Kurile Junction, while the
other branch extends south towards Sakhalin Island. Focal mechanisms
indicate a change from extension to transpression in the northern
Verkhoyansk Range and generally left-lateral transpression in the Chersky
Range extending to northern Kamchatka. The few focal mechanisms on the
second branch suggest right-lateral transpression. A large number of faults,
sub-parallel to the seismicity and presumed to be strike-slip, are visible
in satellite imagery and topographic maps and are also associated with
seismically generated landslides.
These data support a model in which the Sea of Okhotsk forms the core of a
separate Okhotsk microplate surrounded by diffuse boundaries on the north and
west. Microseismicity in continental northeast Russia is most heavily
concentrated within and between the fault systems along the northern boundary
of the proposed Okhotsk plate and indicates a high level of deformation. The
sense of slip on the faults (both from focal mechanisms and geology) are also
generally consistent with the extrusion of the Okhotsk plate to the southeast
as it is compressed between its larger neighbors. The northernmost part of
the Okhotsk plate may be decoupled to some degree from the more stable
central Sea of Okhotsk. |
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