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Estimating the Earthquake Site Response From Ambient Noise Using the Ssrh Approach: Overview, Application and Comparison With Other Techniques

Description: 

Earthquake site effects have a major impact on the seismic hazard. However, evaluating the site response over a broad frequency range and with a high spatial resolution remains difficult. Empirical site effect assessment has shown good reliability up to high frequencies but relies on earthquake recordings, which requires long station deployments. In contrast, seismic ambient noise can be rapidly recorded anywhere at any time. The hybrid standard spectral ratio (SSRh) combines both the spectral ratio from earthquake recordings at a few sites and the spectral ratio from ambient noise recordings at many sites from short duration deployments. Here we present and discuss the results of different studies applying the SSRh techniques on various sites in France, in Greece and in Switzerland. In addition, we investigate the site response at high-spatial resolution using the SSRh in the industrial areas of Cadarache and Marcoule, France. On every tested soil sites, we report a good agreement between the SSRh method and the referenced method based on earthquake observations. We discuss the uncertainties and limitation of the SSRh methods and we evaluate its performance compared to other techniques based on site proxies or/and on ambient noise recordings.

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

Type: Oral

Date: 4/19/2023

Presentation Time: 11:00 AM (local time)

Presenting Author: Vincent Perron

Student Presenter: No

Invited Presentation: 

Authors