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Progress on the Characterization of Epos-France Accelerometric (Rap) and Broad-Band (Rlpb) Network Station: Focus on Implemented Methodologies

Description: 

The characterization of seismological stations, whether they are broad-band or strong-motion, is essential for a better use of the databases. In particular, it involves determining several important proxies (such as the value of V_S30) or a complete velocity profile of S-wave propagation to the geophysical bedrock. We present the progress in the station characterizations carried out on the French seismological networks (RAP and RLBP), both in mainland France and the French West Indies. In addition to the results obtained, we present the acquisition geometries selected and the data processing applied, which is essentially based on MASW measurements to determine the dispersion curves of surface waves at high frequencies, and on FK-type processing applied to passive array data for intermediate and low frequencies.

Our acquisitions do not limit themselves to targeting a depth of investigation of 30 m for the sole purpose of determining the V_S30 parameter. In most cases, the use of large array apertures (several hundreds of meters) let us characterize the depth and Vs of the seismological bedrock.

We also comment on the real improvements made possible by three-component FK approaches (e.g. RTBF, ARDS, ARTBF) proposed by Wathelet et al. (2018, 2024), compared with more conventional approaches (e.g. HRFK).

Session: From Earthquake Recordings to Empirical Ground-Motion Modelling [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Fabrice

Student Presenter: No

Invited Presentation: 

Authors