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WITHDRAWN Vs30 Mapping using MrVBF in Puerto Rico and Hispaniola

Description: 

WITHDRAWN The time-averaged shear-wave velocity to a depth of 30m (VS30) is one of the most used parameters for representing seismic site effects. Based on the analysis of Vs30 data of ~75 sites in Puerto Rico and Hispaniola as well as Vs30 data of ~600 sites globally in the active tectonic region in Tropical climate zone, improvements to the spatial prediction of Vs30 map are proposed using a new trend. The new Vs30 map uses Multi-resolution Valley Bottom Flatness (MrVBF) instead of slope as the terrain constraint. MrVBF combines multiple resolutions to generate a single index to identify the transition of the valley bottom from steep areas. The updated trend model can distinguish areas where a thin surficial unit may overly another geologic unit from areas where the surficial unit may comprise a significant portion of the upper 30 meters. The new VS30 map uses surficial geology and MrVBF for unconsolidated and lithified units and surface geology for lacustrine, marsh, and artificial fill deposits. The results show an improvement in residual characteristics when compared to the existing VS30 maps available in the public domain in the same region.

Session: 2025 Puerto Rico and the U.S. Virgin Islands National Seismic Hazard Model Update [Poster]

Type: Poster

Date: 4/18/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Devjyoti Mitra

Student Presenter: No

Invited Presentation: 

Authors