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| | Abstract | | We investigated the long-period ground motions of strong ground motion records of MW 7.3 and MW 6.3 aftershocks of the 2015 Gorkha Nepal earthquake. The particle motions of the long-period motion appearing after S-wave arrival has retrograde elliptical motion, which indicates the long-period motion is due to Rayleigh wave. We applied the semblance analysis to the narrow band-pass filtered vertical-component velocity waveforms for them. The phase velocity of the Rayleigh wave was estimated to be about 3 km/sec at 10 sec period. We also tried to examine the shear wave velocity of sedimentary deposit for sedimentary site's records. The deepest site THM has 500 m sedimentary deposit and the velocity contrast between sediment and basement rock is very large on all sedimentary sites. |
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