Deep Seismic Sounding Studies In India And Its Tectonic Implications

Tewari, H. C.; Kumar, Prakash

doi:10.3809/jvirtex.2003.00080

Cited by 29 publications

(25 citation statements)

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“…The Narmada and Tapti Rivers flow in these rift valleys. For completeness of the work a brief description of the crustal structure and P -wave velocity distribution along the ThuadaraSindad profile, given by Sridhar (2001); Sridhar and Tewari (2001); and Tewari and Kumar (2003) is presented in the next section.…”

Section: Geology and Tectonic Frame Workmentioning

confidence: 99%

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Thiagarajan

2007

J Earth Syst Sci

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Central India is traversed by a WSW-ENE trending Narmada-Son lineament (NSL) which is characterized by the presence of numerous hot springs, feeder dykes for Deccan Traps and seismicity all along its length. It is divided in two parts by the Barwani-Sukta Fault (BSF). To the west of this fault a graben exists, whereas to the east the basement is uplifted between Narmada North Fault (NNF) and Narmada South Fault (NSF). The present work deals with the 2-D thermal modeling to delineate the crustal thermal structure of the western part of NSL region along the Thuadara-Sindad Deep Seismic Sounding (DSS) profile which runs almost in the N-S direction across the NSL. Numerical results of the model reveal that the conductive surface heat flow value in the region under consideration varies between 45 and 47 mW/m 2 . Out of which 23 mW/m 2 is the contribution from the mantle heat flow and the remaining from within the crust. The Curie depth is found to vary between 46 and 47 km and is in close agreement with the earlier reported Curie depth estimated from the analysis of MAGSAT data. The Moho temperature varies between 470 and 500 • C. This study suggests that this western part of central Indian region is characterized by low mantle heat flow which in turn makes the lower crust brittle and amenable to the occurrence of deep focused earthquakes such as Satpura (1938) earthquake.

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Section: Geology and Tectonic Frame Workmentioning

confidence: 99%

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Thiagarajan

2007

J Earth Syst Sci

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“…As portrayed in the DSS profiles (Tewari and Prakash Kumar, 2003), the region between the Narmada and Tapti rivers is characterized by basement uplift. The analysis of gravity data (Verma and Banerjee, 1992) also shows a higher density crust in the south in comparison to areas north of F1.…”

Section: Discussionmentioning

confidence: 99%

“…This would mean that there is either a lithological change at around this depth or the Curie isotherm is elevated. A high velocity (7.2 km/s) layer, below an average depth of 27 km, has been identified within the lower crust by Tewari and Prakash Kumar (2003) from the reinterpretation of the DSS profiles (Kaila, 1986) in the NSL, using the ray-tracing method, and would support a lithological change. Further, integrated geophysical studies (Rao et al, 1995;Reddy and Rao, 2003;Gokarn, 2003;Arora et al, 1993) suggest the presence of an anomalous zone of a hot upper mantle with temperatures higher than the solidus of basalt (1200…”

Section: Discussionmentioning

confidence: 99%

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Anand

Rajaram

2014

Earth Planet Sp

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Aeromagnetic data analysis over the Narmada-Son Lineament (NSL) shows that prominent anomalies are located over dyke swarms and trap flows and the major formations present have distinct magnetic signatures. A major extensive ENE fault is identified which coincides with the course of the Narmada river and which appears, as earlier suggested, to control Gondwana sedimentation to the south and Vindhyan sedimentation to the north. By isolating the sources, it is found that the signatures of the Deccan traps have a distribution that is possibly related to their time of eruption and subsequent evolution. The region between Hoshangabad (HBD) and Narsimapura (NSR) are made up of two structural units: a shallow ENE structure superposed on a deeper NW-SE feature which is possibly related to the continuation of the Godavari Gondwana Graben towards the northwest. The region north and south of the deep-seated fault F1 has undergone different evolutionary history. The thickness of the magnetic crust in the Narmada-Son region lies between 25 to 31 km, implying a lithological change below this depth. This is borne out by the high velocity layer (7.2 km/s) within the lower crust identified by DSS studies.

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“…Though several geophysical studies have been carried out earlier (Kaila et al, 1985;Verma and Banerjee, 1992;Singh and Meissner, 1995;Tewari and Prakash Kumar, 2003;Mall et al, 2005) including MT studies (Gokarn et al, 2001;Rao et al, 2004;Patro et al, 2005;Harinarayana et al, 2007;Naidu and Harinarayana, 2009) to understand the tectonic scenario of the lineament, the present study has been undertaken in order to add value to the earlier results. A major contribution from the present study is to understand the nature of the crust and mantle structure more clearly and also to examine the electrical signatures of the surface mapped faults such as the Narmada South Fault (NSF), Tapti Fault (TF), Gavligarh Fault (GF) and Purna Fault (PF), etc.…”

Section: Introductionmentioning

confidence: 99%

Electrical signatures of the Earth’s crust in central India as inferred from magnetotelluric study

2011

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The tectonic scenario of the Narmada-Son Lineament (NSL) zone has been the subject of debate for the last few decades. It is characterized tectonically as a highly-disturbed zone in Indian geology since Precambrian times. A magnetotelluric (MT) study has been carried out across the NSL zone along a 270-km-long N-S-trending traverse, extending from Hoshangabad in the North to Ner in the South. As a part of the present study, 25 magnetotelluric soundings have been collected and the data rotated to N70• E after removing local distortions, arising from 3D galvanic effects, using the Groom-Bailey decomposition technique. 2-D inversion has been carried out using an NLCG scheme. The results derived from the 2-D inversion have brought out the highly conductive nature of the mid-lower crust at places coinciding with the known faults. The significant high heat flow and seismicity in the region associated with these faults may be caused by tectonic activity and the highly conductive nature of the mid-lower crust. This may be due to the partial melting of subsurface rocks resulting from the high temperature caused by mantle upwarping in the region. The results are also compared with the gravity and a nearby Deep Seismic Sounding (DSS).

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Deep Seismic Sounding Studies In India And Its Tectonic Implications

Cited by 29 publications

References 0 publications

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Electrical signatures of the Earth’s crust in central India as inferred from magnetotelluric study

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