Capturing the Path Dependency of Site Response in Basin and Non-Basin Southern California Locations
Publication: Geo-Congress 2024
ABSTRACT
The manifestation of ground shaking in sedimentary basins during an earthquake event depends on the energy released by the seismic source, the distance between the source and the basin in question, and the geologic characteristics of the basin. The combination of these components leads to amplification of ground shaking in basins relative to non-basin regions. Within sedimentary basins, spatial variability of ground shaking from location to location occurs due to the complexities associated with the interactions of seismic waves with the 3-dimensional characteristics of the subsurface and the variation of geologic material. This includes refraction which alters the propagation direction of seismic waves, diffraction which spreads and scatters the waves, reflection which can concentrate seismic energy, and their combinations which can generate propagating surface waves. The intensity of these basin-related site effects is drastically impacted by the path between the source and the site within basin (attenuation and basin boundary interactions). Both site effects and path effects are intertwined, and as such, the determination of site response in these geomorphic provinces requires proper understanding of their interactions in order to separate both effects. Using an expanded southern California ground motion dataset that comprises a subset of NGA-West2 plus recent event recordings, this study uses iterative mixed effects modelling scheme to propose a site-dependent path model for southern California. The site-dependent model attempts to partition path-site effects, and the regional model aims to release the ergodic assumption. It is expected that incorporating site dependence based on basin and non-basin features will show reduction in uncertainty in comparison to current in practice ergodic GMMs.
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Information & Authors
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Published In
Geo-Congress 2024
Pages: 411 - 419
History
Published online: Feb 22, 2024
ASCE Technical Topics:
- Basins
- Bodies of water (by type)
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Fluid mechanics
- Hydrologic engineering
- Infrastructure
- Light rail transit
- Rail transportation
- Seismic tests
- Seismic waves
- Solid mechanics
- Surface waves
- Tests (by type)
- Transportation engineering
- Water and water resources
- Water management
- Wave generation
- Wave propagation
- Wave reflection
- Waves (fluid mechanics)
- Waves (mechanics)
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