Date: 4/20/2021
Session Time: 9:45 AM to 11:00 AM Pacific
How Well Can We Assess Site Effects So Far?
In seismic hazard and risk analyses, the effects of near-surface geology on ground shaking need to be quantified as precisely as possible. Ergodic amplification equations in ground motion models (GMM) can only give an average estimate of amplification, and bias is expected in a posterior application at a specific site. Various approaches are currently available to quantify site-specific amplification. If ground-motion records are available at or near a target site, ergodic models can be calibrated to derive site-specific amplification function. Otherwise, ground response analyses (GRA) are carried out to characterize site response. In addition, the horizontal-to-vertical spectral ratio (HVSR) of either earthquake or ambient noise recordings has been proven to be a cost-effective approach in site-effects studies.
In this session, we invite studies dealing with different approaches to quantify site effects. Studies on how to improve our current practice in ground response estimation are particularly welcome, e.g., the search of optimal site characterization proxy (alternative or complementary to the time-averaged 30 m shear-wave velocity and/or the fundamental resonant frequency) to improve ergodic site response models; novel approaches to evaluate the attenuation of wave propagation; ground response analysis and its associated uncertainty; soil nonlinearity, numerical or empirical studies on 2D/3D site effects; and innovative application of the horizontal-to-vertical spectral ratio (HVSR) technique; and integration of site effects into seismic hazard analysis.
Conveners
Chuanbin Zhu, GFZ German Research Centre for Geosciences (chuanbin.zhu@gfz-potsdam.de)
Marco Pilz, GFZ German Research Centre for Geosciences (pilz@gfz-potsdam.de)
Yefei Ren, Institute of Engineering Mechanics, China Earthquake Administration (renyefei@iem.net.cn)
Fumiaki Nagashima, Disaster Prevention Research Institute, Kyoto University (nagashima.fumiaki.6v@kyoto-u.ac.jp)
Oral Presentations
| Participant Role | Details | Start Time | Minutes | Action |
|---|---|---|---|---|
| Submission | Empirical Map-Based Models of Nonergodic Site Response in the Greater Los Angeles Area | 09:45 AM | 15 | View |
| Submission | Evaluation of the High-Frequency Attenuation Parameter in Italy for Site Effect Characterization | 10:00 AM | 15 | View |
| Submission | A Holistic Evaluation of Various Site-Response Estimation Techniques: Ergodic Models, Theoretical Borehole and Outcrop Responses Using GRA and HVSR-Based Empirical Correction | 10:15 AM | 15 | View |
| Submission | Towards a Better Understanding of κ0 at Bedrock Level | 10:30 AM | 15 | View |
| Submission | Assessing One-Dimensional Site Response From Single-Station Earthquake Records | 10:45 AM | 15 | View |
| Total: | 75 Minute(s) |
How Well Can We Assess Site Effects So Far? I
Description
Type: Oral
Date: 4/20/2021
Time: 9:45 AM to 11:00 AM Pacific