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Euro-Mediterranean Hard-Rock Reference Ground Motion Model by Git-Based Site Response Deconvolution

Description: 

In the framework of site-specific seismic hazard assessment, the definition of reference motion is a crucial step. Reference motion is generally associated with hard-rock conditions, characterized by S-wave velocity (V_S) exceeding 2000 m/s. However, ground motion recorded at sites with such conditions is poorly represented in existing strong-motion databases. Thus, the validity domains of most empirical ground motion models (GMMs) are not representative of reference rock conditions. In order to overcome this limitation, we apply a deconvolution of site responses from strong-motion recordings to estimate ground motion at reference conditions in the Euro-Mediterranean context.

The first step was to compile a large database by aggregating the ESM database and additional data from the Greek, French, and Spanish networks. The second step was to estimate site response at network stations by carrying out parametric and non-parametric generalized inversion techniques (GIT). A careful selection of hard-rock reference stations was chosen to constrain the inversions. The database signals are then deconvolved using the site terms obtained by GIT, which makes it possible to virtually bring the sites of the entire database to very high V_S values (bedrock conditions).

GMMs are then determined for reference conditions and the results are discussed.

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: 09:00 AM (local time)

Presenting Author: Fabrice

Student Presenter: No

Invited Presentation: 

Authors