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Ground-motion Processing of Near-fault Ground Motions Preserving Forward Directivity and Fling Effects: An Application to the 2022 Chishang, Taiwan, and 2023 Pazarcik, Türkiye Earthquake Sequences

Description: 

Near-fault effects, such as forward directivity and residual displacement, significantly influence the seismic demand on structures near active faults. However, the limited empirical dataset poses challenges in deriving models to describe such effects, making it essential to develop ground motion processing tools that are able to preserve these characteristics and can help expand the available dataset. Traditional baseline correction methods, which rely on pre-event noise, often fail to eliminate drifts in the later parts of near-fault ground motions. Similarly, high-pass filtering, commonly used to address drifts, tends to remove low-frequency near-fault characteristics. Since these drifts often result from seismometer tilting, we propose a ground motion processing approach designed to preserve these near-fault effects. Our method extends the bilinear and quadratic correction techniques introduced by Boore (1999, 2000). The key improvement lies in selecting the correction time for linear and quadratic fit based on all components simultaneously, improving the stability of the corrections. We demonstrate the effectiveness of this approach by applying it to ground motions from the 2022 Chishang, Taiwan earthquake sequence and the 2023 Pazarcik, Türkiye event. A comparison with GPS network data demonstrates that the proposed method is able to successfully recover permanent slip in the processed ground motions.

Session: Recent Advances in Modeling Near-source Ground Motions for Seismic Hazard Applications - II

Type: Oral

Date: 4/16/2025

Presentation Time: 11:15 AM (local time)

Presenting Author: Grigorios

Student Presenter: No

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