Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1950
Title: Medieval pulse of great earthquakes in the central Himalaya: Viewing past activities on the frontal thrust
Authors: Rajendran, C. P.
John, Biju
Rajendran, Kusala
Keywords: Geochemistry & Geophysics
paleoseismology
seismic gap
great earthquakes
central Himalaya
earthquake recurrence
Regenerative-Dose Protocol
2005 Kashmir Earthquake
Gps Measurements
Lesser Himalaya
Surface Rupture
Nepal Himalaya
Seismic Hazard
Western Nepal
India
Belt
Issue Date: 2015
Publisher: Amererican Geophysical Union
Citation: Journal of Geophysical Research-Solid Earth
120
3
Rajendran, C. P.; John, B.; Rajendran, K., Medieval pulse of great earthquakes in the central Himalaya: Viewing past activities on the frontal thrust. Journal of Geophysical Research-Solid Earth 2015, 120 (3), 1623-1641.
Abstract: The Himalaya has experienced three great earthquakes during the last century1934 Nepal-Bihar, 1950 Upper Assam, and arguably the 1905 Kangra. Focus here is on the central Himalayan segment between the 1905 and the 1934 ruptures, where previous studies have identified a great earthquake between thirteenth and sixteenth centuries. Historical data suggest damaging earthquakes in A.D. 1255, 1344, 1505, 1803, and 1833, although their sources and magnitudes remain debated. We present new evidence for a great earthquake from a trench across the base of a 13m high scarp near Ramnagar at the Himalayan Frontal Thrust. The section exposed four south verging fault strands and a backthrust offsetting a broad spectrum of lithounits, including colluvial deposits. Age data suggest that the last great earthquake in the central Himalaya most likely occurred between A.D. 1259 and 1433. While evidence for this rupture is unmistakable, the stratigraphic clues imply an earlier event, which can most tentatively be placed between A.D. 1050 and 1250. The postulated existence of this earlier event, however, requires further validation. If the two-earthquake scenario is realistic, then the successive ruptures may have occurred in close intervals and were sourced on adjacent segments that overlapped at the trench site. Rupture(s) identified in the trench closely correlate with two damaging earthquakes of 1255 and 1344 reported from Nepal. The present study suggests that the frontal thrust in central Himalaya may have remained seismically inactive during the last similar to 700years. Considering this long elapsed time, a great earthquake may be due in the region.
Description: Restricted access
URI: http://hdl.handle.net/10572/1950
ISSN: 2169-9313
Appears in Collections:Research Articles (Rajendran, C. P.)

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