Ground Response Analysis

Ground response analysis (GRA), also called site response analysis, is a critical tool for predicting how soil layers at a specific site will modify seismic waves during an earthquake.

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Ground Response Analysis overview

Hudson Geotechnics has high-level expertise in GRA. The California Geological Survey (CGS) reviewed a recent GRA report for a Site Class F site by HGI and stated the "…analysis is complete, comprehensive, and well documented in a report by Hudson Geotechnics… Hudson Geotechnics' site response analyses is comprehensive…well designed and well executed."

Stress-strain response analysis

1. Stress-strain response, strain, and excess pore pressure ratio time series colored by time

Maximum profile response plots

2. Maximum profile response

Record ratios showing amplification

3. Amplification and attenuation of shaking