Open Questions: Earthquakes and Seismology

Galaxy: Seismology: Categorized site directory. Entries usually include descriptive annotations.

USGS Earthquake Hazards Progam: Learning and Education: Provides educational information on earthquakes, including frequently-asked questions, short articles on many topics, and external links.
QuakeFinder: Commercial organization that is attempting to provide earthquake forecasting using ground-based sensors and low-orbiting satellites. Sensors detect extremely low frequency (ELF) magnetic field fluctuations. Site includes some external links.
Nevada Seismological Laboratory: An earthquake research facility. The site includes general information on earthquakes, lists of frequently-asked questions, and some external links.
About Earthquakes: Contains general information and references on earthquakes, including lists of frequently-asked questions and overviews of various earthquake topics. From the Nevada Seismological Laboratory.

Why earthquakes stop: June 1998 news article from Physics Web about a model that is able to predict limits to the spreading of earthquakes.

Solving the Paradox of Deep Earthquakes
Harry W. Green II
Scientific American, September 1994, pp. 64-71: 30% of all earthquakes occur at a depth of more than 70 km., and 8% occur at depths of more than 300 km. It has been a mystery how this is possible, given the way rock is expected to flow under high pressure. Now there is a theory to explain such intermediate-focus and deep-focus earthquakes, which occur around subduction zones in the mantle.