On the Selection of Proper Ground Motion Models for PSHA in Mainland Southeast Asia

Date: 4/26/2019

Time: 06:00 PM

Room: Grand Ballroom

Southeast Asia is one of the most seismically active regions in the world with a wide range of tectonic settings, yet it is also among the regions with very limited ground motion modeling related data and studies. The scarcity in strong ground motion observations and limited studies, failing in capturing broadband coverage of predictor variable ranges, for the region makes it a challenging case to build and validate proper ground motion models for probabilistic seismic hazard and risk assessments. This study presents the process of selection of proper ground motion prediction equations (GMPEs) among the most recent global and local models for all tectonic settings and all ranges of predictor variables through Trellis analysis, weighting scheme, and spatial distribution of select intensity measures as PGA and spectral acceleration at spectral periods of 0.3, 1.0 and 3.0 sec. The goal is to supplement the existing knowledge and guidance that is insufficient due to available ground motion observation data and limited applicable studies. For example, a widely used reference, 2007 U.S. Geological Survey seismic hazard maps/study in Southeast Asia, has not yet been updated reflecting the most recent advances in ground motion modeling. Although it is not covered in this study, the resulting ground motion models are used in probabilistic seismic hazard analysis (PSHA) in comparison with reference seismic hazard studies suitable for the region.

Presenting Author: Emel Seyhan

Authors