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Chandrakala, K.
- Structure, Tectonics and Thermal State of the Lithosphere Beneath Intraplate Seismic Region of Latur, Central India: An Appraisal
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Authors
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1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 4 (2009), Pagination: 457-468Abstract
Recent surge in intraplate seismicity has led to detailed geological and geophysical investigations, covering different continental segments of India including seismogenic region of Latur. A synthesis of such data sets to understand the prevailing tectonic and thermal state of the Lithosphere beneath Latur region, that witnessed a large scale human loss due to 1993 seismic activity, has revealed shallow surfacing of denser deeper crustal segments which may have resulted due to ongoing active subsurface tectonic activity like uplift and erosion since geological past. Below this region, Moho temperature exceeds 500°C, heat flow input from the mantle is quite high (29-35 mW/m2) and the asthenosphere is shallow (∼100 ± 10 km). It is suggested that stress generated by ongoing upliftment and related subcrustal thermal anomaly is concentrating in this denser and stronger mafic crust within which earthquakes tend to nucleate. In all likelihood, the seismic activity witnessed in the region may stem from the deep crustal/lithospheric dynamics rather than the role of fluids at the hypocentral depth.Keywords
Latur Earthquake, Geoisotherm, Seismotectonics, Upwarp, Crustal Velocity, Intraplate Seismicity, Granulites, Mantle Heat Flow.
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- Seismic Signatures of a Proterozoic Thermal Plume Below Southwestern Part of the Cuddapah Basin, Dharwar Craton
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Authors
Affiliations
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 565-572Abstract
Origin and evolutionary history of the Cuddapah Basin in SE India has remained a subject of considerable speculation whether it was evolved through vertical tectonic movements, extentional stretching or even cometary impact. Based on detailed seismic and other geophysical studies (Gravity, magnetotelluric and heat flow), we have delineated signatures of a possible deep seated mantle plume below southwestern part of the Cuddapah Basin, which may have been responsible for the 1.1 Ga kimberlitic magmatism in the eastern part of the Dharwar craton (EDC). The thermal anomaly associated with this mantle plume appears to have resulted into 15 - 20 km thick magmatic underplating (Vp: 7.10-7.30 km/s; density 3.07-3.16 g/cm3) below the Parnapalle region of the southwestern Cuddapah Basin, which also coincides with the high gravity and high conductivity anomaly. The massive underplating led to thickening of the crust to about 40 - 44 km below southwestern part of the Cuddapah Basin, compared to about 34 ± 2 km in the surrounding regions of EDC, indicating thermal restructuring of the Crust/Mantle boundary. This plume, which was apparently active in an area of about 500 km radius, may have also affected the Closepet granitic region, which is ∼100 km west of Cuddapah Basin.Keywords
Deep Seismic Sounding, Mantle Plume, Gravity, Underplating, Cuddapah Basin, Dharwar Craton.- Crustal Velocity Structure of the Dharwar Craton, India
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Authors
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN