1897 Assam earthquake

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1897 Assam earthquake
1897 Assam earthquake is located in India
1897 Assam earthquake
Date June 12, 1897 (1897-06-12)
Magnitude 8.1 Mw
Epicenter 26°N 91°E / 26°N 91°E / 26; 91Coordinates: 26°N 91°E / 26°N 91°E / 26; 91
Areas affected India
Casualties 1,500

The Assam earthquake of 1897 occurred on June 12 in Assam, British Raj, and had an estimated moment magnitude of 8.1.[1] Considering the size of the earthquake, the mortality rate was not that high, with about 1,500 casualties, but property damage was very heavy.

Thought to have happened 20 miles (32 km) underground, it left 150,000 square miles (390,000 km2) of masonry buildings in ruins and was felt over 250,000 square miles (650,000 km2) from Burma to New Delhi. Numerous buildings in the neighboring country of Bhutan were heavily damaged. There were very many aftershocks.[2]

Background[edit]

The earthquake occurred on the SSW-dipping reverse Oldham fault that forms the northern edge of the Shillong Plateau within the Indian Plate.[1][3] There was a minimum displacement on the main fault of 11 m, although up to 16 m has been calculated, one of the greatest for any measured earthquake.[1] The calculated area of slip extended 110 km along strike and from 9 to 45 km below the surface, indicating that the entire thickness of the crust was involved.

See also[edit]

References[edit]

  1. ^ a b c Bilham and England, Plateau Pop-up during 1897 Assam Earthquake, Nature, 410, 806-809, 2001.
  2. ^ Kalita, Jugal. "The Great Assam Earthquake of 1897". Assam Portal. 
  3. ^ Hough, S.E.; Bilham, R., Ambraseys, N. & Feldl, N. (2005). "Revisiting the 1897 Shillong and 1905 Kangra earthquakes in northern India: Site response, Moho reflections and a triggered earthquake". Current Science 88: 1632–1638. 
Sources
  • Gahalaut V.K. and Chander R., A rupture model for the great earthquake of 1897, northeast India.
  • Oldham, Richard D. 'Report on the great earthquake of 1897'. Geological Survey of India, Calcutta, 1899.
  • Lee, W.H.K., and M. Meyers and N. Shimazaki. 'Historical Seismograms and Earthquakes of the World Academic Press, San Diego, 1988.

Further reading[edit]