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Does the Mississippi Embayment Edge Have Any Effect on Site Amplification?

Description: 

In this research, we focus on investigating the effects of the basin edge on site amplification in the Mississippi Embayment (ME) area considering the Horizontal-to-Vertical Spectral Ratio (HVSR) method. Recognizing the critical need to understand the subtle wave interactions and variations in ground motion amplification at the boundaries of sedimentary basins, this study focuses on the ME as a representative geological setting. By doing so, we aim to enhance our understanding of site-specific seismic hazards in this region. Our research initiative represents a pioneering effort in the exploration of basin-edge effects within the ME, contributing significantly to the expansion of knowledge in this field. Employing a comprehensive USGS dataset collected from a strategically positioned 280 km-long E-W array at 36°N spanning the ME, we conduct detailed analyses utilizing the HVSR method.

Findings reveal interesting insights into the distribution of site amplification within the ME. At lower frequencies around 0.3 Hz, amplification is higher in the central ME, indicating complex basin-induced effects. In contrast, at higher frequencies like 2.5 and 5 Hz, significant amplification is notably concentrated near the edges of the basin, where sediment thickness decreases. These contrasting patterns highlight the dynamic nature of site amplification phenomena in sedimentary basin boundries.

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

Type: Oral

Date: 4/17/2025

Presentation Time: 05:00 PM (local time)

Presenting Author: Zohreh

Student Presenter: Yes

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