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Improving the Performance of the SSRh Site-Response Assessment Techniques on a Dense Array in the Koutavos Basin (Greece)

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 SSRh results from a dense array of 51 seismic nodes deployed in the Koutavos Basin in Greece. We report a good agreement between the SSRh method and the referenced method based on earthquake observations. Furthermore, we quantitatively evaluate the performance of applying various statistical and signal processing procedures in order to improve the SSRh method.

Session: How Well Can We Predict Broadband Site-Specific Ground Motion and Its Spatial Variability So Far? - I

Type: Oral

Date: 5/1/2024

Presentation Time: 08:15 AM (local time)

Presenting Author: Vincent

Student Presenter: No

Invited Presentation: 

Authors