Sediments and the Moho Topography beneath Himalaya

Sai Teja, Kuruva (2019) Sediments and the Moho Topography beneath Himalaya. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Kuruva Sai Teja (14MS067)) 14MS067.pdf - Submitted Version Restricted to Repository staff only Download (6MB)

Abstract

The Kathmandu and the regions around the Indo-Gangetic plain with highly dense human population are the most seismic prone regions which contain the thick sediments that amplify the seismic waves due to an earthquake in the region. The Nepal Earthquake that occured on April 2015 with magnitude greater than 7.8 Mw affected more than 22000 people in that vicinity.We study the sedimentary structure and crustal thickness of the Kathmandu region and the regions present in the Indo-Gangetic plain through inversion of the receiver function time series at 30 broadband seismograph locations.Results show a sedimentary layer thicknesses of 6.0km in the southern side of Kathmandu till Gadhimai region.Crustal thicknesses varies from 45 in the Southern part of Kathmandu,to 54 km in the Northern Part of the Kathmandu and Vp/Vs ratio of 1.86. The thick sediments have been observed in our study region which is highly densed in terms of population and the construction is poor,This sediments significantly amplifies the earthquake ground motion, and hence can produce large damage due to a moderate earthquake which can be mitigated by our studies.

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