Publikationsdatum:
2015-10-29
Beschreibung:
Central Nepal was struck on 25 April 2015 by the M w 7.8 ( M L 7.6) Gorkha earthquake, which initiated about 80 km northwest of Kathmandu and ruptured toward the east along a 140-km-long west-northwest–east-southeast fault segment. Kathmandu basin, located about halfway along the ruptured segment a few kilometers from the southernmost fault tip, was strongly affected. In this article, we present a preliminary analysis of the acceleration-time histories of the 25 April 2015 M w 7.8 mainshock and the 12 May 2015 M w 7.3 ( M L 6.8) aftershock recorded at the Department of Mines and Geology office building in central Kathmandu valley. We analyze their frequency content using Stockwell et al. (1996) time–frequency decomposition and a polarization analysis ( Pinnegar, 2006 ). We then compute their strong-motion parameters and finally compare their spectral accelerations with the Boore and Atkinson (2008) ground-motion prediction equation.
Print ISSN:
0895-0695
Digitale ISSN:
1938-2057
Thema:
Geologie und Paläontologie
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