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Crustal structure of the Indian Shield: New constraints from teleseismic receiver functions.

Authors

Kumar,  R.
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Saul,  Joachim
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Sarkar,  D.
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/persons/resource/kind

Kind,  Rainer
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Shukla,  A. K.
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Citation

Kumar, R., Saul, J., Sarkar, D., Kind, R., Shukla, A. K. (2001): Crustal structure of the Indian Shield: New constraints from teleseismic receiver functions. - Geophysical Research Letters, 28, 7, 1339-1342.


https://gfzpublic.gfz-potsdam.de/pubman/item/item_227757
Abstract
Teleseismic earthquake waveform data from 10 broadband stations spread over the Indian shield and in operation since 1997, were analysed to infer the crustal structure, using the receiver function technique. The South Indian shield is characterized by a 33 - 39 km thick, and remarkably simple crust, with an average Poisson's ratio close to 0.25. The Archaean crust is devoid of any prominent intra-crustal discontinuities. The velocity contrast at the well developed Moho is large, resulting in very clear P-to-S conversions as well as first-order multiples. In contrast, the predominantly Proterozoic crust in the northern part of the shield exhibits a complex character, due to the shield exhibits a complex character, due to the presence of additional seismic discontinuities. Moho conversions, which are considerably weaker compared to the Archaean terrains, indicate crustal thicknesses of more than 40 km.