Surface heat flow and Pn velocity distribution in Peninsular India

Sharma, Somya; Sundar, A.; Rao, V. K.; Ramana, D. V.

doi:10.1016/0264-3707(91)90030-i

Cited by 14 publications

(14 citation statements)

References 13 publications

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“…KUBIK (1988) also observed an inverse correlation between surface heat flow and P n velocity data from Europe, Asia, North America and Australia. Moreover, SHARMA et al (1991) have also observed a similar relationship for the data from different continents including India. In many areas temperatures at the Moho alone do not adequately explain these variations due to inhomogeneity, composition and density of lower crustal rocks (FAGERNES and KANERSTROM, 1973;CHUNG, 1977;KUBIK, 1988).…”

Section: Surface Heat Flow Estimatessupporting

confidence: 57%

“…Therefore, in general, an inverse linear correlation between P n velocity and surface heat flow has been observed in different continents (BLACK and BRAILE, 1982;KUBIK, 1988;SHARMA et al, 1991). BLACK and BRAILE, (1982) derived the relationship between conductive heat flow and P n velocity from the data for all the physiographic provinces in North America.…”

Section: Surface Heat Flow Estimatesmentioning

confidence: 99%

“…In many areas temperatures at the Moho alone do not adequately explain these variations due to inhomogeneity, composition and density of lower crustal rocks (FAGERNES and KANERSTROM, 1973;CHUNG, 1977;KUBIK, 1988). In light of the uncertainty on the available heat flow (Q s ) data, we use here an empirical relation derived by SHARMA et al (1991) to estimate Q s : Vol. 162, 2005 Geothermal Structure 133…”

Section: Surface Heat Flow Estimatesmentioning

confidence: 99%

“…The line is a least-squares fit for the data fromSHARMA et al (1991). Surface heat flow (full circle) with error bars computed by using P n velocity in the NSL seismoactive region.…”

mentioning

confidence: 99%

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Geothermal Structure in a Seismoactive Region of Central India

Sharma

Rao

Mall

et al. 2005

Pure appl. geophys.

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The geothermal structure beneath a seismoactive region of central India has been determined by using two independent geophysical parameters, i.e., P n velocity and Curie point depth, which are temperature dependent. P n velocity has been determined by reanalyzing deep seismic sounding (DSS) records obtained for this region. Surface heat flow has been computed using the P n velocity data from this region and found to be 55 ± 5 mW m )2 . Curie point depths have been derived from the magnetic satellite data in this region, and reveal an identical value of heat flow of around 56 ± 4 mW m )2 . We estimated temperatures of 600-700°C at a Moho depth of 39 km by using surface heat flow ranging from 50 to 60 mW m )2 and a simple 1-D geothermal model. The present study suggests the presence of a brittle-ductile transition (high strength) zone ranging in depth from 20 to 35 km, where the temperatures range from 350 to 550°C. We also suggest that the nucleation of earthquakes in this region took place in a relatively high strength zone. This is supported by the fact that the focal depths of all the recent earthquakes (from 1978 to 2000 of magnitude ‡ 3.5) lie in this zone of high strength.

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Section: Surface Heat Flow Estimatessupporting

confidence: 57%

Section: Surface Heat Flow Estimatesmentioning

confidence: 99%

Section: Surface Heat Flow Estimatesmentioning

confidence: 99%

“…The line is a least-squares fit for the data fromSHARMA et al (1991). Surface heat flow (full circle) with error bars computed by using P n velocity in the NSL seismoactive region.…”

mentioning

confidence: 99%

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Geothermal Structure in a Seismoactive Region of Central India

Sharma

Rao

Mall

et al. 2005

Pure appl. geophys.

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show abstract

“…In general, an inverse linear correlation between P n velocity and surface heat flow has been observed in different continents (Black and Braile, 1982;Kubik, 1988;Sharma et al, 1991). Black and Braile, 1982 derived the relationship between conductive heat flow and P n velocity from the data for all the physiographic provinces in North America.…”

Section: Seismic Structure and Surface Heat Flow Estimatesmentioning

confidence: 98%