CompuServe Messages

There are whole textbooks on earthquakes at the junior/senior level. However, I just finished reading a very nice introduction, a hardcover aimed at intelligent lay readers by Bruce Bolt of U.C.-Berkeley. It's called something like _Earthquakes and Geological Discovery_ (Scientific American Library, 1995). With regard to aftershocks, I remember hearing that the Marina district in San Francisco was particularly hard hit by the 1989 earthquake. It's interesting that the reason isn't (a) stability of the land there (i.e., hard or soft earth) or (b) proximity to the epicenter (which was a bit south of Santa Cruz, in a state park I've visited). It was how the land in between transmitted, deflected, and amplified the waves under the earth.