Empirical Green’s Function Simulations Toward Site-Specific Ground Motion Prediction for Kopili Fault of NER India

Abstract

We report new findings for producing broad-band ground motion time histories (1–19 Hz) of a future earthquake in a sedimentary basin based on the application of extended rupture modelling together with the use of empirical Green's functions (EGFs). This technique is used to model a MW 6.0 earthquake in Kopili fault zone (KFZ) north-eastern India (NER). We ran simulations for a sediment site (VS30 = 360 to 760 m/s) and a rock site (VS30 = 760 to 1500 m/s) to obtain the ground motion, which are then compared with a number of ground motion prediction equations (GMPEs). These GMPEs agree with the simulated ground motion amplitude, confirming that once we have precise source terms, the artificial ground-motions generated from earthquake scenarios of a specific site may be employed for seismic design safety in that given site. This work may open the door to additional in-depth, site-specific research in this area.