Amplitude Corrections for Regional Seismic Discriminants


Introduction | Ch. 1 | Ch. 2 | Ch. 3 | Ch. 4 | Ch. 5 | Ch. 6 | Ch. 7 | Ch. 8 | Ch. 9 | Ch. 10 | Summary

Advantage of Amplitudes

Operational Flexibility
- Fits well into operational pipeline
- Few correction parameters (6 parameters for each phase, all frequencies tied to mb (or M0) and D only)
- "Decouples" correction and discrimination problem

Physically-Based Models

- Parameters tied to simple physical model
- No unphysical variation of parameters as a function of frequency
- In regions having little data, reasonable corrections can be obtained using expert opinion or extrapolation from geophysically similar regions
- Amplitude residuals can be interpolated (Kriged) to approximate spatial corrections not accounted for by simple 1-D model
Discrimination Flexibility
- Retains all information (no pre-censoring of data by preselecting ratios)
- All information available for special event analysis
- Amenable to multivariate analysis
- preselected ratios may not be independent
- preselection of "best" discriminants may not give optimum performance
- Tie to detection thresholds for negative evidence discrimination or outlier detection
- Tie to SNL network modeling (for capability studies, metrics)