Mapping a NEHRP Site Class Using Multi-channel Analysis of Surface Waves (MASW) Method in Southeast Missouri, USA
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Abstract
Multi-channel surface wave seismic data was acquired at 40 pre-selected sites in the Poplar Bluff study area in southeast Missouri. Additionally, cross-hole seismic data were also acquired at two of these sites. The primary goal was to generate the NEHRP (National Earthquake Hazards Reduction Program) soil amplification map for the Poplar Bluff area using the average shear wave velocity values derived from the multi-channel analysis of surface wave (MASW) data. The secondary goal was to evaluate the accuracy of the MASW estimates. The NEHRP map of the study area generated from these data closely matched the surficial geologic map. Areas mapped on the existing surficial geology map as either Mississippi Embayment lowland soils or Ozark alluvial valley soils have weighted average shear-wave velocity values till 30 m depth (Vs(30)) ranging from 182 to 365 m/s, corresponding to NEHRP soil class D. Areas mapped as Ozark upland residual soil, in contrast, have values in the 365 to 762 m/s range, corresponding to NEHRP soil class C.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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