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Source, Path and Site Parameters: Validation and Calibration for the Northern Marmara Region, Turkey

Session: Advances in Understanding Near-Field Ground Motions: Observation, Prediction and Application II

Type: Oral

Date: 4/22/2021

Presentation Time: 02:15 PM Pacific

Description: 

This study presents estimation of source, path and site parameters for Istanbul, needed for stochastic ground motion modeling. We made use of strong ground motion records from the Istanbul Earthquake Rapid Response and Early Warning System operated by the Department of Earthquake Engineering of Boğaziçi University. These data are used to: (I) compute the horizontal-to-vertical spectral ratios (HVSR) using S-wave windows, by defining the soil profile in seven categories by considering Vs₃₀ values; (II) estimate κ₀, the site component of κ, which is controlling the amplitude decay at high frequencies observed in Fourier amplitude spectra of S-wave time windows of strong ground motions; (III) estimate the frequency-dependent anelastic attenuation parameter for S-waves, Q_S, by considering two subregions in the Marmara Sea; (IV) to simulate six medium magnitude earthquakes that are associated with the main Marmara fault for the validation and calibration of the stochastic ground motion simulation model that eventually will be used for the regional simulation of M7+ earthquakes.

Presenting Author: Hakan Suleyman

Student Presenter: Yes

Authors