Journal of Aeronautics & Aerospace Engineering
Open Access
ISSN: 2168-9792
+44-77-2385-9429
ISSN: 2168-9792
+44-77-2385-9429
D Shanker
Indian Institute of Technology Roorkee, India
Posters-Accepted Abstracts: J Aeronaut Aerospace Eng
Earthquakes are regarded as the most dangerous natural hazards because they strike all of a sudden without any warning with respect to space, time and magnitude. The prediction of earthquakes is one of the most important societal goals in the seismological research. Indo-Nepal Himalaya accommodated all major tectonic features of the Himalayan mobile belt and is seismically one of the active regions in the Himalayan arc. In the present work, anomalous seismicity and the delineation of preparation zones are carried out using the temporal and the spatial distribution of events considering the total events and the events with mb â�¥4.3 in four anomalous episodes, respectively. Observations indicate that there is a significant fluctuation in seismicity prior to large earthquakes. It have been observed that, three medium size earthquakes of 1980 (mb 6.1), 1984 (mb 5.6) and 1999 (mb 6.6) already occurred in the Western Nepal and its adjoining Indian region were preceded by well-defined patterns of precursory swarm. Other two cases for which gap period still continues but no earthquake occurred till date is inspected for future earthquake. Study indicates that an earthquake with M 6.5�±0.5 should have occurred till December 2011 in delineated preparatory area (29.3o-30.5o N and 81.2o-81.9o E) having focal depth range 10-30 km. However, analyzing seismicity data from period 1963-2006 conclude that delay in impending earthquake is the case of a repeated swarm sequence and April 25, 2015 (M 7.9) Nepal earthquake was the consequence of this, which probably enhanced the preparatory area, magnitude and occurrence period.
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dayasfeq@iitr.ac.in