Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...77..177s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 77, Issue 3-4, p. 177-188.
Physics
2
Scientific paper
Based on the transition of rock deformation from brittle to ductile regimes and the near orthogonality of ductile and semi-ductile conjugate shear belts, it is proposed that the belt-like and net-like distribution of shallow earthquakes, which occur dominantly in the upper and middle crust and form the so-called `seismogenic layer', is controlled by the plastic-flow belts and network in the lower lithosphere including the lower crust and the lithospheric mantle. The large-scale seismic belts or network are, therefore, a manifestation of the underlying plastic-flow network. From the epicenter distribution a unified plastic-flow network system is revealed extending over a large area of central and eastern Asia. Its geometric and dynamic features support the view that compression from the Indian plate is the main driving force for the intraplate tectonic deformation. The plastic-flow network in the lower lithosphere controls intraplate deformation, involving seismicity, tectonic stress field, low-velocity/high-conductivity layer in the crust, etc., and may be an essential characteristic of continental plates with collisional boundaries.
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