Crustal Strain Patterns in the Satpura Mountain Belt,Central India: Implications for Tectonics and Seismicity in Stable Continental Regions |
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Authors: | S Mohanty |
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Institution: | (1) Department of Applied Geology, Indian School of Mines, Dhanbad, 826004, India |
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Abstract: | The Satpura Mountains of central India represents an ancient orogenic belt of the Mesoproterozoic time. It has a distinct
sygmoidal (S-shaped) geometry with long EW and short NE–SW alignments. The mountain belt has been affected by tectonic activities
throughout the geological past. The association of high seismicity, high heat flow and high Bouguer gravity anomaly with high
topography of the region is a very distinct feature of the mountain range. Present analysis demonstrates that the average
velocity for central India has a value of ~54 mm/year towards N050°. The velocity field vector can be partitioned into an
eastward component parallel to the Satpura Mountain Belt and a northward component across the belt. The partitioned components
provide evidence for sinistral strike–slip deformation of anomalously high shear strain rate of ~3 × 10−9/year in the region. Similar high shear strain rates are also found from the strain determined by GPS data. An extremely high
rate of extensional strain (~600 × 10−9/year), which is comparable to that of the continental rift systems, is recorded from geodetic data of the Satpura Mountain
Belt and the adjacent regions. Regional sinistral shape of the Satpura Mountains involved in a sinistral-slip transtension
regime is interpreted to be the cause of high extensional and shear strain regime of the area. The occurrence of normal faulting
detected in several deep seismic sounding profiles, the Moho upwarp, crustal thinning, high heat flow and high seismicity
of the Satpura region are explained by this tectonic model. |
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