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Does Detailed Site Characterization and Ground Response Analysis Change Projected Building Damage Estimates?

Description: 

In regions such as the Central and Eastern United States (CEUS), the presence of soft soils and strong impedance contrasts can induce significant amplification of ground shaking, thereby exacerbating the effects of even low-magnitude earthquakes. Site conditions in the CEUS are not well captured by traditional VS30-based site categories. This study utilizes high-resolution subsurface data, including depth-to-bedrock maps and sediment velocity models that are available across the state of Massachusetts, in conjunction with a detailed building inventory, to assess the impact of soil conditions on the seismic vulnerability of buildings. By integrating these datasets with HAZUS-informed fragility functions, the study offers an in-depth evaluation of potential building damage across the state using design shaking levels provided by the U.S. Geological Survey National Seismic Hazard Model. Using a building inventory that includes a variety of building types and occupancy, this study identifies locations and building types within the state that are most at risk. The analysis is performed first using VS30-based soil amplification and then rerun using theoretical linear one-dimensional ground response analysis for each building location. These results are compared to highlight the limitations of VS30-based site characterization in a region like Massachusetts where amplification is driven by sediment thickness and strong impedance contrasts. These findings contribute to a deeper understanding of seismic vulnerability and resilience in regions of low- to moderate seismic hazard, emphasizing the necessity for region-specific approaches to enhancing building safety and community preparedness.

Session: New Directions in Environmental, Seismic Hazard and Mineral Resource Exploration Studies - II

Type: Oral

Date: 4/17/2025

Presentation Time: 05:30 PM (local time)

Presenting Author: Laurie

Student Presenter: No

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