Determining Coseismic Landslide Hazard Using Regional-Scale Physics-Based Ground-Motion Simulation
Description:
The influence of seismic ground motion on landslide hazards is vital to assess associated risks to settlements and infrastructure, especially to mountainous communities. Because several thousands of landslides may occur over a large area during and shortly after an earthquake, a statistical analysis must be performed to quantify the spatially distributed hazard and risk.
Using landslide inventories from three earthquakes (Haiti 2010, Iwate Japan 2008, and Hokkaido Japan 2018), we statistically analyze the main factors contributing to coseismic landslides occurrence. We determine ground motion intensity measures using physics-based shaking simulations with kinematic ruptures embedded in a 3D Earth model, which we calibrate using empirical ground motion models (GMM). The physics-based shaking simulations allow us to study how rupture properties and site effects, especially topographic effects, affect coseismic landslide occurrence. Ground-motion simulations generate time series for each point of the model domain, allowing for a more comprehensive analysis of shaking intensity than standard methods like GMM. For example, our simulations provide specific intensity measures (IM’s) of shaking, like Arias intensity (Ia), cumulative absolute velocity (CAV), peak-ground motion (PGV, PGA), and spectral acceleration (SAT), as well as the ground-motion frequency content.
We test the benefit of the ground-motion simulations in explaining the coseismic landslide distribution. Specifically, we propose a methodology to better use results of ground motions simulations to explain landslide occurrence based on the Newmark sliding-block model approximation. We conjecture that the new methodology can be further explored to build future earthquake scenarios and associated coseismic landslides.
Session: Coseismic Ground Failure: Advances in Modeling, Impacts and Communication
Type: Oral
Date: 4/20/2023
Presentation Time: 10:00 AM (local time)
Presenting Author: David Castro-Cruz
Student Presenter: No
Invited Presentation:
Authors
David Castro-Cruz Presenting Author Corresponding Author david.castrocruz@kaust.edu.sa King Abdullah University of Science and Technology |
Ashok Dahal a.dahal@utwente.nl University of Twente |
Luigi Lombardo l.lombardo@utwente.nl University of Twente |
Hakan Tanyas h.tanyas@utwente.nl University of Twente |
P. Martin Mai martin.mai@kaust.edu.sa King Abdullah University of Science and Technology |
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Determining Coseismic Landslide Hazard Using Regional-Scale Physics-Based Ground-Motion Simulation
Category
Coseismic Ground Failure: Advances in Modeling, Impacts and Communication