Abstract
We evaluated the quality of seismic phase data from Indian seismological stations through the analysis of teleseismic travel times reported during 1976–83 and infer that only WWSSN stations (NDI, SHL, POO, KOD) apart from GBA and HYB can be rated satisfactory while the majority of stations (more than 40) produce very poor quality data sets. Detailed analysis of teleseismic P-wave travel time residuals shows that while the average structure of the upper mantle beneath India has high velocity (negative residuals) there are marked lateral variations. In particular, three zones of anomalous positive residuals (low velocity) are observed: one beneath the north western part of the Deccan trap, the second covering the southernmost peninsula (granulite terrain) and a third rather localized one, to the north of Delhi coinciding with Delhi-Haridwar ridge. New Delhi exhibits strong negative residuals in the E-SE quadrant along with negative station anomaly, implying that it is underlain by an anomalous high velocity crust/upper mantle. The negative residuals observed over India, continue beneath the Himalaya till the south of Lhasa but change sign further northward, suggesting the northern limit of the Indian upper mantle structure.
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References
Aki K, Christofferson A and Husebye E S 1977 Determination of the three dimensional structure of the lithosphere;J. Geophys. Res. 82 277–296
Allegre C Jet al 1984 Structure and evolution of the Himalaya-Tibet orogenic belt;Nature (London) 307 17–22
Arora B R and Mahashabde M V 1987 A transverse conductive structure in the northwest Himalaya;Phys. Earth Planet. Int. 45 119–127
Bhattacharya S N 1974 The crust mantle structure of the Indian Peninsula from surface wave dispersion;Geophys. J. R. Astron. Soc. 36 273–283
Brandon C and Romanowicz B 1986 A no lid zone in the central Chang-Thang platform of Tibet: evidence from pure path phase velocity measurements of long period Rayleigh waves;J. Geophys. Res. 91 6547–6564
Bulletin of the International Seismological Centre, 1976–83
Cleary J and Hales A 1966 An analysis of the travel times of P-waves to North American stations in the distance range 30 to 100;Bull. Seismol. Soc. Am. 56 467–489
Dziewonski A M and Gilbert F 1976 The effect of small aspherical perturbations as travel times and a reexamination of the corrections for ellipticity;Geophys. J. R. Astron. Soc. 44 7–16
Dziewonski A M and Anderson D L 1981 Preliminary reference earth model;Phys. Earth Planet. Int. 25 297–356
Dziewonski A M and Anderson D L 1983 Travel times and station corrections for P waves at teleseismic distances;J. Geophys. Res. 88 3195–3214
Gaur V K, Chander R, Sarkar I, Khattri K N and Sinvhal H 1985 Seismicity and the state of stress from investigations of local earthquakes in the Kumaon Himalaya;Tectonophysics 118 243–251
Herrin E 1968 Introduction to 1968 seismological tables for P phases;Bull. Seismol. Soc. Am. 58 1193–1241
Hirn Aet al 1984a Crustal structure and variability of the Himalayan border of Tibet;Nature (London) 307 23–25
Hirn Aet al 1984b Lhasa block and bordering sutures—A contribution of a 500km Moho traverse through Tibet;Nature (London) 207 25–27
Jeffreys H and Bullen K E 1958 Seismological tables. British Association for advancement of Science, London
Jobert Net al 1985 Deep structure of southern Tibet inferred from the dispersion of Rayleigh waves through a long period seismic network;Nature (London) 313 386–388
Kaila K L 1982 Deep seismic sounding studies in India;Bull. Geophys. Res. 20 309–328
Kaila K L and Tewari H C (ed.) 1985 Deep seismic sounding and crustal tectonics;Proc. Int. Symp. on D.S.S traverses 22–24 Nov Bhubaneshwar, India
Lyon-Caen H 1986 Comparison of the upper mantle shear wave velocity structure of the Indian shield and the Tibetan plateau and tectonic implications;Geophys. J. R. Astron. Soc. 86 727–749
Molnar P and Chen W P 1984 S-P travel time residuals and lateral inhomogeneity in the mantle beneath Tibet and the Himalaya;J. Geophys. Res. 89 6911–6917
Molnar P 1988 A review of geophysical constraints on the deep structure of the Tibetan plateau. The Himalayas and the Karakorum and their tectonic implications;Philos. Trans. R. Soc. London A326 33–88
Naqvi S M and Rogers J J W 1987 Precambrian geology of India. (New York: Oxford Univ. Press) pp 223
Peseckis L L and Burdick L J 1982 Station site characteristics of WWSSN stations in India and southern Asia;Bull. Seismol. Soc. Am. 72 1207–1218
Qureshy M N and Warsi W E K 1980 A bouguer Anomaly map of India and it's relation to broad tectonic elements of the subcontinent;Geophys. J. R. Astron. Soc. 61 235–242
Rai S Set al 1992 Seismic Tomography of the south Indian shield;Curr. Sci. 62 213–226
Romanowicz B A 1979 Seismic structure of the upper mantle beneath the United States by three dimensional inversion of body wave arrival times;Geophys. J. R. Astron. Soc. 57 479–506
Seismological Bulletin India Meteorological department, Division of Seismology, 1976–1983
Singh D D 1987 Crust and upper mantle velocity structure beneath north and central India from the phase and group velocity of Rayleigh and Love waves;Tectonophysics 139 187–203
Srinagesh Det al 1989 Evidence for thick continental roots beneath south Indian shield;Geophys. Res. Lett. 16 1055–1058
Valdiya K S 1984Aspects of Tectonics: Focus on south central Asia, (New Delhi: Tata McGraw Hill) pp 219
Verma R K 1991Geodynamics of the Indian peninsula and the Indian plate margin. (New Delhi: Oxford and IBH) pp 356
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Mohan, G., Rai, S.S. Critical evaluation and geological correlation of teleseismic phase data from Indian seismological stations. Proc. Indian Acad. Sci. (Earth Planet Sci.) 101, 387–401 (1992). https://doi.org/10.1007/BF02893013
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DOI: https://doi.org/10.1007/BF02893013