3D near-surface soil response from H/V ambient-noise ratios
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Abstract
The applicability of the horizontal-to-vertical (H/V) ambient-noise spectral ratio for characterizing earthquake site effects caused by nearsurface topography and velocity structures was evaluated at sites underlain by thick (i.e. >100 m) sediment deposits near the southern-end of the New Madrid seismic zone in the central United States. Three-component ambient-noise and velocity models derived from seismic (shearwave) refraction/reflection surveys showed that a relatively horizontal, sharp shear-wave velocity interface in the soil column resulted in an H/V spectral ratio with a single well-defined peak. Observations at sites with more than one sharp shear-wave velocity contrast and horizontally arranged soil layers resulted in at least two well-defined H/V spectral ratio peaks. Furthermore, at sites where there were sharp shear-wave velocity contrasts in nonhorizontal, near-surface soil layers, the H/V spectra exhibited a broad-bandwidth, relatively low amplitude signal instead of a single well-defined peak.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | 3D near-surface soil response from H/V ambient-noise ratios |
| Series title | Soil Dynamics and Earthquake Engineering |
| DOI | 10.1016/S0267-7261(02)00109-4 |
| Volume | 22 |
| Issue | 9-12 |
| Year Published | 2002 |
| Language | English |
| Publisher | Elsevier |
| Description | 12 p. |
| First page | 865 |
| Last page | 876 |
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