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Estimation of Vs Profiles from Strongmotion Records

Description: 

In recent years, a large number of strongmotion stations have been deployed all over the world, enabling the recording of large numbers of strongmotion records. While being a source of significant information for the community, this data losses significance if the site are not properly caracterized. Usually, a small percentage of strngmotion site have been properly characterized. In this study, we proposed to retrieve 1D S wave velocity (Vs) profile using only strongmotion records from the respective station. We analyse data from moderate earthquakes, retrieving parameters such as horizontal-to-vertical vertically incident S waves and Rayleigh wave's ellipticity and group velocity; that can be used to estimate the corresponding Vs profile. Preliminary results shows a better performance for lower frequencies (< 1 Hz), hindering our analysis of higer frequencies. In turn, this produces lower resolution in the upper part of the obtained Vs profiles. Currently, we are addressing the significance of this reduced resolution of the shallow part of the Vs profile. This methodology will enable the caracterization of strongmotion sites considering only records from registered data, providing usefull information for its appropiriate analysis.

Session: Station Installations and Site Conditions, a Quest for Improved Strong Motion Database [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Felipe

Student Presenter: No

Invited Presentation: 

Poster Number: 62

Authors