31Aug 2014

Source Parameters of Local Earthquakes in Nubra Region, NW Himalaya

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The digital time histories of local earthquake data recorded during January 2010 to February 2011 by a local network of broad band seismographs in Nubra Valley region has been used to estimate the earthquake source parameters. The source parameters viz., seismic moment, source radius and stress drop of these events have been estimated following Brune’s earthquake source model (1970). The low frequency spectral level and corner frequency has been estimated from the displacement spectra and has been used to estimate the source parameters. The seismic moment ranges between 2.1 x 1020 to 3.34 x 1023 dyne-cm for seismic events with magnitudes ranges between 2.7 to 5.0. The circular source radius (r) calculated using Brune’s formula lies in the range 693.2 m to 1.296 km. The estimated stress drops ranges between 0.1 to 61.7 bars and found in agreement with the other region of Himalaya. The stress drop shows increasing trend with seismic moment for magnitudes less than 3.8 and becomes constant for higher magnitude events, this observation has been reported in various studies.

[Rajinder Parshad, Snehmani, Reeta Rani, Vandana Ghangas, Arjun Kumar, V. Rana, P. Joshi, P. K. Shrivastva, A. Ganju (2014); Source Parameters of Local Earthquakes in Nubra Region, NW Himalaya Int. J. of Adv. Res. 2 (8). 0] (ISSN 2320-5407). www.journalijar.com

Rajinder Parshad

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