Thanks to the many readers who have sent their comments and suggestions to me over the past year. I plan to use your suggestions when I return to those topics in future columns. This issue's column features a rapid return to the subject of earthquake location, which generated an unusual level of correspondence. Here, I mention two contributions. First, Prof. José Pujol (University of Memphis) has created graphics related to the classic geometric techniques of earthquake location, and links to his figures can be found via the EduQuakes Web page. Second, Prof. Cinna Lomnitz (UNAM) has provided a guest column...

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