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Spectral Decomposition of Ground Motions in New Zealand using the Generalized Inversion Technique

Description: 

In this study, we perform spectral decomposition of the Fourier amplitude spectra (FAS) of ground motions in the New Zealand Ground-Motion Database (GMDB v3.0) compiled during the National Seismic Hazard Model (NSHM) 2022 update project. We apply a non-parametric generalized inversion technique (GIT) to isolate source, path, and site effects from ground motions of selected events (1367 crustal, 910 intra-slab and 431 interface). Each channel (HN, BN, HH and EH) is treated as an independent “site” (total no.: 693). We will present the preliminary results on site responses at each “site”, the attenuation (geometric spreading and frequency-dependent quality factor) for different types of events, as well as the source spectra of each earthquake and its corresponding source parameters (seismic moment, corner frequency and Brune stress drop) assuming an omega-square model.

Session: Site-specific Modeling of Seismic Ground Response: Are We Quantitative Enough to Predict?

Type: Oral

Date: 4/19/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Chuanbin Zhu

Student Presenter: No

Invited Presentation: 

Authors