**9. Acknowledgments**

This chapter was adapted with permission from the paper "Focal Depth Determination for Moderate and Small Earthquakes by Modeling Regional Depth Phases *sPg*, *sPmP*, and *sPn*" published by *Bull. Seism. Soc. Am*. It covers the author's long-time research results. Most of the research is from time spent as a Visiting Fellow at the Geological Survey of Canada, Ottawa, where colleagues Dr John Adams, David McCormack, and Veronika Peci provided key references and made useful suggestions. Part of the research is from post-doctoral work at Carleton University, Ottawa. Two anonymous reviewers provided constructive recommendations that improved that paper dramatically. BSSA Associate Editor Lorraine W. Wolf proved helpful suggestions for publication of this superficially simple but important paper. The efforts from the staff at the InTech - Open Access Publisher make the publication of this chapter possible. The author is grateful for all assistance listed above.

#### **10. References**


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