Official Magnitude Reference:
\nKanamori, H. (1977).
\nThe energy release in great earthquakes.
\nJournal of Geophysical Research, 82(20), 2981-2987.\n
\nN.B: The magnitude for this earthquake has been recalculated since the following articles were written. Magnitude 8.6 is a\nbetter determination of the size of this earthquake.\n
\n
\nAt least 780 people killed and many\nbuildings collapsed in the Nyingchi-Qamdo-Zhamo (Rima, Zayu)\narea of\neastern Tibet. Sandblows, ground cracks\nand large landslides occurred in the\narea. In the Medog area, the village of\nYedong slid into the Yarlung Zangbo\n(Brahmaputra) River and was washed\naway. The quake was felt at Lhasa and\nin Sichuan and Yunnan Provinces, China.\n
\n\nSevere damage (X) also occurred in the\nSibsagar-Sadiya area of Assam, India\nand in the surrounding hills. About 70\nvillages were destroyed in the Abor\nHills, mostly by landslides. Large\nlandslides blocked the Subansiri River.\nThis natural dam broke 8 days later,\ncreating a wave 7 m (23 ft) high which\ninnundated several villages and killed\n536 people.\n
\n\nThe quake was felt (VI) as\nfar away as Calcutta. Seiches were\nobserved in many lakes and fjords of\nNorway and in at least 3 reservoirs in\nEngland. Many sources call this the\nAssam-Tibet earthquake or even the\nAssam earthquake, even though nearly\nall place the epicenter in Tibet. Thus\nit is possible that the casualties for\nTibet are not included in the total,\nas well as those from the Subansiri River\nflood. Furthermore, Gu et al. do not\ngive casualty totals for Yedong or\nother areas of the most severe damage\nin Tibet. Therefore, the actual\ncasualty toll may be much higher than\nthe value given.\n
\n\nIntensity scale X at Sadya, Passighat, Dum Duma, Dibrugarh, North Lakhimpur, and Sibsagar; IX at Digboi and Galaghat; VIII at Tezpur, Ganhati, and Shillong; VI at Daca, Calcutta Dhubri, Darjeeling, and Imphal.\nMacroseismic area 1,794,000 sq km, of which 49,700 sq km suffered great damage.\n
\n\nThis great earthquake, destructive in Assam and Tibet, has a calculated magnitude of 8.6 and Strasbourg regards it as the most important since the introduction of seismological observing stations.\nAlterations of relief were brought about by many rock falls in the Mishmi Hills and destruction of forest areas.\nIn the Arbor Hills 70 villages were destroyed with 156 casualties due to landslides.\nDykes blocked the tributaries of the Brahmaputra; that in the Dibang valley broke without causing damage,\nbut that at Subansiri opened after an intermal of 8 days and the wave, 7 metres high,\nsubmerged several villages and killed 532 persons.\n
\n\n\nFrom\nISC Bulletin, The International Seismological Summary.\n\n
\n\n\nTwo thousand homes, temples and mosques destroyed. Hardest hit is the Brahmaputra Basin in NE India.\n
\n\n\nFrom\nSeismological Notes, Bulletin of the Seimological Society of America.\n\"Seismological Notes\" is a list of recent important earthquakes with short summaries included in each issue of the BSSA.\n\n
\n\nStrictly this was not an Indian earthquake; the epicenter was near Rima, in a region claimed by both China and Tibet.\nIt is one of the few earthquakes to which the instrumentally determined magnitude, 8.7, is assigned.\nThis shock was more damaging in Assam, in terms of property loss, than the earthquake of 1897.\nTo the effects of shaking were added those of flood; the rivers rose high after the earthquake,\nbringing down sand, mud, trees, and all kinds of debris.\nPilots flyng over the meizoseismal area reported great changes in topography;\nthis was largely due to enormous slides, some of which were photographed.\n
\n\nThe only available on-the-spot account is that of F. Kingdon-Ward, a botanical explorer who was at Rima.\nHowever, he had little opportunity for obeservations; he confirms violent shaking at Rima, extensive slides,\nand the rise of the streams, but his attention was perforce directed to the difficulties\nof getting out and back to India.\nAftershocks were numerous; many of them were of mangitude 6 and over and\nwell enough recorded at distant stations for reasonably good epicenter location.\nFrom such data Dr. Tandon, of the Indian seismological service, established an enormous geographical\nspread of this activity, from about 90 deg to 97 deg east longitude,\nwith the epicenter of the great earthquake near the eastern margin.\n
\n\nOne of the more westerly aftershocks, a few days later,\nwas felt more extensively in Assam than the main shock;\nthis led certain journalists to the absurd conclusion that the later shock\nwas 'bigger' and must be the greatest earthquake of all time!\nThis is a typical example of the confusion between the essential concepts of magnitude and intensity.\nThe extraordinary sounds heard by Kingdon-Ward and many others at\nthe times of the main earthquake have been specially investigated.\nSeiches were observed as far away as Norway and England.\n(p. 63-64.)\n
\n\nKingdon-Ward, near the epicenter of the great Tibet earthquake of 1950,\nheard heavy explosive sounds following the shock, coming apparently from high in the air.\nThese sounds were heard at many points in India and Burma, to distances of over 750 miles.\n(p. 128.)\n
\n\n\nFrom\nRichter, Charles F., 1958, Elementary seismology:\nSan Francisco, W.H. Freeman and Company, 768 p.\n\n
\n\n\n1950 Aug 15 14:09, 26.6 N 96.5E, maximum intensity XI, 1526 deaths,\nextreme damage [extreme = $25 million or more U.S. at the time of the earthquake].\nIndia: Assam. India-China.\n
\n\n\nFrom\nDunbar, Paula K., Lockridge, Patricia A., and Whiteside, Lowell S., 1992,\nCatalog of significant earthquakes 2150 B.C. - 1991 A.D.:\nU. S. Dept. of Commerce, National Oceanic and Atmospheric Administration.\n\n
\n\nThe term seismic seiche was coined by Anders Kvale in 1955 to\ndescribe oscillations of lake levels in Norway and England caused by the earthquake of August 1950 in Assam, India.\n(p. 153.)\n
\n\n1950 August 15, India, Assam, 1526 deaths, magnitude 8.6, Surface faulting\n(p. 271.)\n
\n\n\nFrom\nBolt, Bruce A., 1993, Earthquakes: New York, W.H. Freeman and Company, 331 p.\n\n
\n\n\n1950 Aug. 15, India, Assam, 1,530 deaths, magnitude 8.7\n(p. 4.)\n
\n\n\nFrom\nSteinbrugge, Karl V., 1982, Earthquakes, volcanoes, and tsunamis,\nAn anatomy of hazards: 280 Park Avenue, New York, N.Y. 10017, Skandia America Group, 392 p.\n\n
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