Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Details Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications Shallow velocity structure along the Hirapur-Mandla profile using traveltime inversion of wide-angle seismic data, and its tectonic implications

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..505s&link_type=abstract

Geophysical Journal International, Volume 142, Issue 2, pp. 505-515.

Astronomy and Astrophysics

Astronomy

2

Central India, Inversion, Tectonics, Traveltime, Velocity Structure, Wide-Angle Seismic Data

Scientific paper

In order to investigate the velocity structure, and hence shed light on the related tectonics, across the Narmada-Son lineament, traveltimes of wide-angle seismic data along the 240km long Hirapur-Mandla profile in central India have been inverted. A blocky, laterally heterogeneous, three-layer velocity model down to a depth of 10km has been derived. The first layer shows a maximum thickness of the upper Vindhyans (4.5kms-1) of about 1.35km and rests on top of normal crystalline basement, represented by the 5.9kms-1 velocity layer. The anomalous feature of the study is the absence of normal granitic basement in the great Vindhyan Graben, where lower Vindhyan sediments (5.3kms-1) were deposited during the Precambrian on high-velocity (6.3kms-1) metamorphic rock. The block beneath the Narmada-Son lineament represents a horst feature in which high-velocity (6.5kms-1) lower crustal material has risen to a depth of less than 2km. South of the lineament, the Deccan Traps were deposited on normal basement during the upper Cretaceous period and attained a maximum thickness of about 800m.

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