Reconstruction of Paleostresses in the West of Sakhalin from Tectonophysical Research Findings
P. A. Kamenev1, A. V. Marinin2
1Institute of Marine Geology and Geophysics, Far East Branch, Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russia
2Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Keywords: Tectonic stresses, slickensides, jointing, coal fields of Sakhalin, West Sakhalin terrain, geomechanics
Abstract
The article discusses tectonic stresses determined in the West Sakhalin terrain using different tectonophysical methods. The reconstruction of the stress field in coal fields in Sakhalin is implemented using the graphical method of orientation finding of stress axes in fractures and faults (at 16 observation points). The supplementary on-site tectonophysical studies made it possible to estimate the preferred orientation of the main slickensides of different kinematics and to reconstruct on this basis the local stress tensors at 53 observation points. The typical stress state of the West Sakhalin terrain is horizontal tension.
|
