Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics

Details Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.173...92g&link_type=abstract

Geophysical Journal International, Volume 173, Issue 1, pp. 92-104.

Astronomy and Astrophysics

Astronomy

4

Magnetotelluric, Seismicity And Tectonics, Crustal Structure, Asia

Scientific paper

Magnetotelluric studies over the Shillong plateau and lower Brahmaputra sediments have delineated the Dauki fault as a NE-SW striking thrust zone with a dip angle of about 30°, along which the low resistivity layer of Bengal sediments and the underlying oceanic crust subduct to the northwest. At present, about 50 km length of these sequences has subducted beneath the Shillong plateau and is traced up to depth of about 40 km. Another thrust zone, sub parallel to the Dauki thrust is observed in the lower Brahmaputra valley, corresponding to the Brahmaputra fault. This is interpreted to be an intracratonic thrust within the Indian plate. These results suggest that a large fraction of the seismicity over the Shillong plateau is associated with the NE-SW striking Dauki thrust, contrary to the earlier belief that this fault zone is relatively aseismic. The present studies also suggest that the Shillong plateau and the adjoining sedimentary layers act as a supracrustal block, not directly participating in the subduction process. However in response to the compressive tectonic forces generated by the Himalayan and Indo-Burman subduction processes the Shillong plateau, together with the Brahmaputra sediments overlying the Indian crust drift eastwards relative to the Bengal sediments along the surface expression of the Dauki fault leading to a dextral strike slip movement. We thus propose that the NE Indian crust responds to the compressive forces differently at different depths, governed by the rheological considerations. At deeper levels the crustal readjustments take place through the subduction along the Dauki and Brahmaputra thrusts where as, at the shallow levels the relative deformability of the supracrustal blocks have a strong influence on the tectonics, leading to the strike slip mechanism along the surface expression of the Dauki fault.

Affiliated with

Also associated with

No associations

Rating

Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1341901