caa a22 4500 465724124 CHVBK 20180323111725.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF02295830 doi (NATIONALLICENCE)springer-10.1007/BF02295830 Travel times of P -waves in North-East India [Elektronische Daten] [M. Sitaram, George John, P. Rao, M. Saikia] Summary: Based on 90 accurately localized earthquakes in and around North-East India and the local crustal velocity model of Gupta et al. [4], the travel times of P-waves have been determined from the foci of these earthquakes at arbitrarily selected depths of 5, 13, 25, 41 and 50 km to the sites of the seismic stations operated by the Regional Research Laboratory, Jorhat and the National Geophysical Research Institute, Hyderabad, and also to the sites of the Shillong and Tura seismic stations run by the India Meteorological Department, New Delhi. The travel times of P-waves fit a straight line very well with velocities of 5·97 ± 0·31, 6·18 ± 0·01, 6·41 ± 0·03, 7·82 ± 0·07 and 7·95 ± 0·01 km/sec at each of the depths under study. Similar investigations of P* and Pg-waves of 16 earthquakes at a depth of 10 km have revealed velocities of 6·53 ± 0·31 and 5·64 ± 0·34 km/sec, respectively. A simplified two-layered crustal model consisting of an average crustal thickness of 41·5 km with 22·2 and 19·3 km thick layers has been obtained. Academia, Publishing House of the Czechoslovak Academy of Sciences, 1990 Sitaram M. Regional Research Laboratory, 785006, Jorhat, Assam, India aut John George Oil and Natural Gas Commission, Jorhat, Assam, India aut Rao P. Regional Research Laboratory, 785006, Jorhat, Assam, India aut Saikia M. Regional Research Laboratory, 785006, Jorhat, Assam, India aut Studia Geophysica et Geodaetica Kluwer Academic Publishers 34/2(1990-05-01), 96-109 0039-3169 34:2<96 1990 34 11200 https://doi.org/10.1007/BF02295830 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02295830 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sitaram M. Regional Research Laboratory, 785006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- John George Oil and Natural Gas Commission, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Rao P. Regional Research Laboratory, 785006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Saikia M. Regional Research Laboratory, 785006, Jorhat, Assam, India aut NATIONALLICENCE 773 0- Studia Geophysica et Geodaetica Kluwer Academic Publishers 34/2(1990-05-01), 96-109 0039-3169 34:2<96 1990 34 11200 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer