Source, Basin, and Site Effects in Strong Motion Records of the 2015 Gorkha Earthquake


Abstract eng:
The M7.8 Gorkha, Nepal mainshock ruptured a segment of the Main Himalayan Thrust directly below Kathmandu Valley, causing strong shaking levels and extensive structural damage across the valley. Strong motion data reveal an initial 6-s source pulse followed by 4-6 s energy reverberating within the basin. One of the striking features of the observed ground motions in the valley is that they were depleted of energy in the 0.5-10 Hz frequency range, which likely limited the severity of the structural damage compared to other possible realizations of similar ruptures. Isolated cases of liquefaction and lateral spreading of unconsolidated sediments were also observed but have not yet revealed a systematic damage pattern. Initial analysis of available data suggests that several different factors, including source and path as well as site effects, were responsible for the unusual character of the ground motions. In this paper, we review earthquake reconnaissance as well as available strong motion records from Kathmandu Valley to better understand the observations from this earthquake.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 609.:
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