Site response in the eastern United States: A comparison of Vs30 measurements with estimates from horizontal:vertical spectral ratios

GSA Special Papers
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Abstract

Earthquake damage is often increased due to local ground-motion amplification caused by soft soils, thick basin sediments, topographic effects, and liquefaction. A critical factor contributing to the assessment of seismic hazard is detailed information on local site response. In order to address and quantify the site response at seismograph stations in the eastern United States, we investigate the regional spatial variation of horizontal:vertical spectral ratios (HVSR) using ambient noise recorded at permanent regional and national network stations as well as temporary seismic stations deployed in order to record aftershocks of the 2011 Mineral, Virginia, earthquake. We compare the HVSR peak frequency to surface measurements of the shear-wave seismic velocity to 30 m depth (Vs30) at 21 seismograph stations in the eastern United States and find that HVSR peak frequency increases with increasing Vs30. We use this relationship to estimate the National Earthquake Hazards Reduction Program soil class at 218 ANSS (Advanced National Seismic System), GSN (Global Seismographic Network), and RSN (Regional Seismograph Networks) locations in the eastern United States, and suggest that this seismic station–based HVSR proxy could potentially be used to calibrate other site response characterization methods commonly used to estimate shaking hazard.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Site response in the eastern United States: A comparison of Vs30 measurements with estimates from horizontal:vertical spectral ratios
Series title GSA Special Papers
Volume 509
Year Published 2014
Language English
Publisher Geological Society of America
Contributing office(s) Geologic Hazards Science Center
Description 13 p.
First page 67
Last page 79
Country United States