Shallow P- and S-wave velocities and site resonances in the St. Louis region, Missouri-Illinois
Earthquake Spectra
By: R. A. Williams, J. K. Odum, W. J. Stephenson, and Robert B. Herrmann
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Abstract
As part of the seismic hazard-mapping efforts in the St. Louis metropolitan area we determined the compressional and shear-wave velocities (Vp and Vs) to about a 40-m depth at 17 locations in this area. The Vs measurements were made using high-resolution seismic refraction and reflection methods. We find a clear difference in the Vs profiles between sites located on the river floodplains and those located in the upland urban areas of St. Louis. Vs30 (average Vs to 30-m depth) values in floodplain areas range from 200 to 290 m/s (NEHRP category D) and contrast with sites on the upland areas of St. Louis, which have Vs30 values ranging from 410 to 785 m/s (NEHRP categories C and B). The lower Vs30 values and earthquake recordings in the floodplains suggest a greater potential for stronger and more prolonged ground shaking in an earthquake. Spectral analysis of a M3.6 earthquake recorded on the St. Louis-area ANSS seismograph network indicates stronger shaking and potentially damaging S-wave resonant frequencies at NEHRP category D sites compared to ground motions at a rock site located on the Saint Louis University campus. ?? 2007, Earthquake Engineering Research Institute.
Suggested Citation
Williams, R.A., Odum, J.K., Stephenson, W.J., and Herrmann, R., 2007, Shallow P- and S-wave velocities and site resonances in the St. Louis region, Missouri-Illinois: Earthquake Spectra, v. 23, no. 3, p. 711-726, https://doi.org/10.1193/1.2753548.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Shallow P- and S-wave velocities and site resonances in the St. Louis region, Missouri-Illinois |
| Series title | Earthquake Spectra |
| DOI | 10.1193/1.2753548 |
| Volume | 23 |
| Issue | 3 |
| Publication Date | August 01, 2007 |
| Year Published | 2007 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earthquake Spectra |
| First page | 711 |
| Last page | 726 |