Mathematics – Logic
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..751p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 7, p. 751-754
Mathematics
Logic
60
Earth Crust, Himalayas, Seismology, Strain Distribution, Structural Properties (Geology), Topography, Earthquakes, Mathematical Models, Nepal, Ray Tracing, Stress-Strain Relationships
Scientific paper
The Department of Mines and Geology has been monitoring the seismicity of the Central Himalayas of Nepal since 1985. Intense microseismicity and frequent medium-size earthquakes (mL is greater than 4) tend to cluster beneath the topographic front of the Higher Himalaya. This 10-20 km deep seismicity also correlates with a zone of localized uplift that has been evidenced from geodetic data. Both microseismic and geodetic data indicate strain accumulation on a mid-crustal ramp that had been previously inferred from geological and geophysical evidence. This ramp connects a flat decollement under the Lesser and Sub-Himalaya with a deeper decollement under the Higher Himalaya, and probably acts as a geometric asperity where strain and stress build up during the interseismic period. The large Himalayan earthquakes could nucleate there and probably activate the whole flat-and-ramp system up to the blind thrusts of the Sub-Himalaya.
Avouac Jean-Philippe
Lavé Jérôme
Massot J. P.
Pandey M. R.
Tandukar R. P.
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