Maggi A, Jackson J A, Priestley K, Baker C 2000 A reassessment of focal depth distributions in southern Iran, the Tien Shanand northern India: Do earthquakes really occur in the continental mantle? Geophys. Maggi A, Jackson J A, McKenzie D and Priestley K 2000 Earthquake focal depths, effective elastic thickness, and strength of the continental lithosphere Geology 28 495–498 Lyon-Caen H and Molnar P 1983 Constraints on the structure of the Himalaya from an analysis of gravity anomalies and a flexural model of the lithosphere J. Lyon-Caen H and Molnar P 1985 Gravity anomalies, flexure of the Indian plate, and the structure, support and evolution of the Himalaya and Ganga basin Tectonics 4 513–538 King G C P and Bilham R G 1973 Strain measurement instrumentation and technique Philosophical transactions of the Royal Society of London, A274 209–217 Kenner S J 2001 How faults are loaded: the influence of tectonic environment American Geophysical Union Fall Meeting, EOS Fall Meeting Supplemental, 82 F942 December 2001 Karner G D and Watts A B 1983 Gravity anomalies and flexure of the lithosphere at mountain ranges J. In: Project Crumansonata: Geoscientific Studies of the Son-Narmada-Tapti Lineament Zone Geol. Jain S C, Nair K K K and Yedekar D B 1995 Geology of the Son-Narmada-Tapti Lineament Zone in Central India. Jackson J 2002 Strength of the continental lithosphere: time to abandon the jelly sandwich? GSA Today 12 (9) 4–9 Gowd T N, Srirama Rao S V and Gaur V K 1992 Tectonic stress field in the Indian subcontinent J. Goudie A 1995 The changing earth, rates of geomorphological Processes (Blackwell) pp 302 Glennie E A 1931 Gravity Survey of India Geodetic Report, VI 52–64, Dehra Dun 101 3015–3029Įngdahl R, van der Hilst R and Buland R 1997 Global teleseismic earthquake relocation with improved travel times and procedures for depth determination Bull. Oldham's memoir “the structure of the Himalayas and of the Gangetic Plain as elucidated by geodetic observations in India” Survey of India Professional Paper 18 Dehra Dun, pp 33ĭmowska R, Zheng G and Rice J R 1996 Seismicity and deformation at convergent margins due to heterogeneous coupling J. 79 9 1259–1269īilham R and England P 2001 Plateau pop-up during the great 1897 Assam earthquake Nature 410 806–809īilham R, Larson K, Freymueller J and Project Idylhim members 1997 GPS measurements of present-day convergence across the Nepal Himalaya Nature (London) 386 61–64īurrard S G 1901 The attraction of the Himalaya mountains upon the plumb-line in India Survey of India Professional Paper 5 Dehra Dun, pp 115īurrard S G 1912 On the origin of the Himalaya mountains Survey of India Professional Paper 12 Calcutta, pp 26Ĭhen W-P and Kao H 1996 Seismotectonics of Asia: some recent progress, in the tectonic evolution of Asia, (ed) An Yin and T M Harrison Cambridge Universiy Press, 37–54Ĭowie H McC 1921 A criticism of Mr. In: Himalaya and Tibet: mountain roots to mountain tops, (ed) A Macfarlane, R Sorkhabi, and J Quade Geological Society of America Special Paper 328 pp 313-323īendick R and Bilham R 2001 How perfect is the Himalayan Arc? Geology 29 791–794īilham R 1988 Earthquakes and urban growth Nature 336 625–626īilham R and Gaur V K 2000 Geodetic contributions to the study of seismotectonics in India Curr. The overall flexural stress distribution provides a physical basis for earthquake hazard mapping and suggests that areas of central India where no historic earthquakes are recorded may yet be the locus of future damaging events.īendick R and Bilham R 2001 Search for buckling of the southwest Indian coast related to Himalayan collision. The N/S spatial gradient of stress exceeds 2 bars/km near the flexural bulge. The Bhuj, Latur and Koyna earthquakes and numerous other recent reverse faulting events occurred in this compressional setting. The current study highlights an outer trough south of the flexural bulge in central India where surface stresses are double the contiguous compressional stresses to the north and south. The imposition of this stress field on the northward moving Indian plate appears fundamental to explaining the current distribution of intraplate earthquakes and their mechanisms. The wavelength (and therefore local gradient) of stress variation is a function of the effective elastic thickness of the plate, estimates of which have been proposed to lie in the range 40–120 km. Calculations of the stress distribution within a flexed Indian plate reveal spatial variations throughout the depth of the plate and also a function of distance from the Himalaya. It is manifest topographically and in the free-air gravity anomaly and the geoid. The flexural bulge in central India resulting from India's collision with Tibet has a wavelength of approximately 670 km.
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