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Session: Numerical Modeling of Earthquake Ground Motion, Seismic Noise, Rupture Dynamics and Seismic Wave Propagation [Poster]

Type: Poster

Date: 4/25/2019

Time: 06:00 PM

Room: Grand Ballroom

[Withdrawn] Broadband Ground Motion Simulation of Nonlinear Basin Effects in Kathmandu During the 2015 Mw 7.8 Gorkha Earthquake

We study the 3D nonlinear basin effects in Kathmandu Valley, Nepal during the 2015 Mw 7.8 Gorkha earthquake using a hybrid broadband ground motion simulation approach. We are particularly interested in understanding the source of frequency and amplitude characteristic, and the reasons they pertain to the lack of high frequency components. In order to do that, we couple a kinematic source model with a realistic 3D geometry of Kathmandu basin, which accounts for nonlinear behavior in unconsolidated sediments, to capture low frequency component of ground motion. Moreover, a stochastic approach is used to include the high frequency portion of ground motion. We finally combine the resultant time-histories in corresponding frequency ranges to investigate the behavior of Kathmandu basin during the mainshock. Despite the scarcity of material properties, stratigraphy information, and geotechnical databases, our results show that our model significantly improves ground motion prediction compared to rudimentary 1D and 2D basin analyses. Our goal is to use the validated model to derive a synthetic Ground Motion Prediction Equation (GMPE) for the capital and the most populated region of Nepal.

Presenting Author: Peyman Ayoubi

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