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Validation and Calibration of Simulation Parameters for the Marmara Region Through Stochastic Simulation of the 26 September 2019 Mw 5.8 Silivri Earthquake

Session: Physics-Based Earthquake Rupture Modeling and Strong Motion Simulations [Poster]

Type: Poster

Date: 4/22/2021

Presentation Time: 03:45 PM Pacific

Description: 

In this presentation, stochastic simulations are performed on the recordings of the 26 September 2019 Silivri, Istanbul earthquake, that ld to damages in the city. Our aim is to create a valid synthetic model database with consistent source, path, and site parameters in the region. We have utilized recordings at 58 stations in Istanbul with epicentral distances ranging from 23 to 101 km and located on sites having different soil conditions. We utlized a stochastic finite fault simulation approach with a dynamic corner frequency.Four different frequency-dependent Q models were tested to obtain the best fit with the observations. With the comparison of the generated ground motions to the observed ones, optimum source, path and site parameters have been estimated. The calibrated model parameters have been obtained from the set of best-fitted data with observed ground motion in frequency domain. Synthetic PGAs have been compared with two well defined ground motion prediction equations (GMPEs). Furthermore, spatial distributions of the ground motion intensity parameters were obtained and compared with the available damage information. In conclusion, the results of the simulation were in good agreement with the recorded ones. The results indicate that the stochastic model proposed herein can be used to simulate ground motion distributions in Istanbul for past and future events.

Presenting Author: Nesrin Yenihayat

Student Presenter: Yes

Authors