On using surface-source downhole-receiver logging to determine seismic slownesses
Soil Dynamics and Earthquake Engineering
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
We present a method to solve for slowness models from surface-source downhole-receiver seismic travel-times. The method estimates the slownesses in a single inversion of the travel-times from all receiver depths and accounts for refractions at layer boundaries. The number and location of layer interfaces in the model can be selected based on lithologic changes or linear trends in the travel-time data. The interfaces based on linear trends in the data can be picked manually or by an automated algorithm. We illustrate the method with example sites for which geologic descriptions of the subsurface materials and independent slowness measurements are available. At each site we present slowness models that result from different interpretations of the data. The examples were carefully selected to address the reliability of interface-selection and the ability of the inversion to identify thin layers, large slowness contrasts, and slowness gradients. Additionally, we compare the models in terms of ground-motion amplification. These plots illustrate the sensitivity of site amplifications to the uncertainties in the slowness model. We show that one-dimensional site amplifications are insensitive to thin layers in the slowness models; although slowness is variable over short ranges of depth, this variability has little affect on ground-motion amplification at frequencies up to 5 Hz.
Suggested Citation
Boore, D., and Thompson, E., 2007, On using surface-source downhole-receiver logging to determine seismic slownesses: Soil Dynamics and Earthquake Engineering, v. 27, no. 11, p. 971-985, https://doi.org/10.1016/j.soildyn.2007.03.005.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | On using surface-source downhole-receiver logging to determine seismic slownesses |
| Series title | Soil Dynamics and Earthquake Engineering |
| DOI | 10.1016/j.soildyn.2007.03.005 |
| Volume | 27 |
| Issue | 11 |
| Year Published | 2007 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Soil Dynamics and Earthquake Engineering |
| First page | 971 |
| Last page | 985 |