Present-day stress field changes along the Baikal rift and tectonic implications

Article Abstract:

A stress tensor analysis allows the study of the dynamics and kinematics of the Baikal Rift Zone (BRZ), Siberia, and their relations with the India-Asia collision. The analysis is based on a database of 319 focal mechanisms of earthquakes located along the entire Baikal rift. The stress regime of the BRZ varies from an extensional one in the central part of the rift to wrench ones in its northern and southern ends. Deformation patterns reveal distinct northern and southern parts of the rift. The interaction between collisional tectonics and the inherited structures influences the rift dynamics.

Observations, Rock deformation, Rifts (Geology)

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Tectonic inheritance, crustal architecture, and contrasting structural styles in the Venezuela Andes

Article Abstract:

The tectonic inheritance, crustal architecture and contrasting structural styles in the Venezuela Andes were investigated using surface and subsurface data images. The results suggested that the Venezuela Andes comprised a Neogene transpressional feature. The tectonic inheritance of older structures were proposed to explain the contrasting structural styles along the strike of the North Andean flank and the middle of the northern, central and southern segments of the orogen. The results further suggested that the observed asymmetry was due to preexisting Paleozoic thrusts.

Analysis, Natural history, Venezuela, Geology, Structural, Structural geology, Andean region

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