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Vs30 Measurements at Puerto Rico Seismic Sites

Description: 

Average shear wave measurements in a depth of 30 meters subsoil (Vs30), were made with the purpose of identifying the type of subsoil in different seismological station sites of Puerto Rico to better understand the seismic wave amplification at the sites during earthquakes, and provide the data collected to help generate updated Motion Predictions, Building Parameters, Hazard Maps, Shake Maps, and provide site data to Emergency Management entities.

Active source surveys were performed in Spring of 2022 at 22 individual sites using both shear wave and primary wave data. Most collected lines were ~106m in length however at select sites the length was shortened due to logistical limitations. Field data has been collected for 22 individual sites. Here a MASW analysis of the field data for nine broadband stations and one accelerometer on the west side of Puerto Rico are presented. The MASW analysis for stations mainly on the west side of Puerto Rico yielded Vs30’s ranging from 200 to 699 m/s, with exception of AGPR and GBPR. The majority of these stations are classified as soil types C and D, which consist of very dense soil, soft rock, and stiff soil. On the contrary, AGPR and GBPR are located on or close to bedrock, with Vs30’s of 784.6 and 1693.7 m/s respectively. MASW analysis currently in process for 12 stations located on the eastern side of the Island; the results of which will also be presented here.

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: Cherilyn Toro Acosta

Student Presenter: Yes

Invited Presentation: 

Authors