Vestnik Otdelenia nauk o Zemle RAN, VOL. 6, NZ1001, doi:10.2205/2014NZ000121, 2014

Deep structure of the Earth's seismic regions (Sakhalin Island)

A. G. Rodnikov, L. P. Zabarinskaya, N. A. Sergeyeva

Geophysical Center RAS, Moscow, Russia

Abstract

According to geologic-geophysical data the geodynamic model of a deep structure of Northern Sakhalin in the area where in 1995 there was a Neftegorsk earthquake is constructed. The geodynamic model up to 40 km in depth covers the North Sakhalin sedimentary basin, the western part of a Deryugin basin, and an ophiolite complex located between them. The Deryugin Basin was formed in place of an ancient deep trench after subducting the Okhotsk Sea Plate under Sakhalin in the Late Cretaceous-Paleogene. The North Sakhalin Basin was formed on the side of the back-arc basin at that time. The ophiolite complex is fixed in the position of ancient subduction zone that was active in the Late Cretaceous-Paleogene. On the surface, the subduction zone is manifested as deep faults stretched along Sakhalin. It is probable that the Neftegorsk earthquake was a result of activation of this ancient subduction zone.

Received 29 January 2014; published 12 April 2014.

Copyright 2014 by the Geophysical Center RAS