Earthquake Topics — Earthquake facts

Cool Earthquake Facts — fascinating earthquake facts (USGS)
Earth Science World Records — description and graphics of plate tectonics, earthquakes, and more (Extreme Science)
Earthquake 101 Powerpoint Slideshow online — preview of the complete PowerPoint show for the basics (USGS)
Earthquake Facts & Earthquake Fantasy — Companion to "Earthquakes, Megaquakes, and the Movies" (USGS)
Earthquake Statistics — Frequency of different magnitude earthquakes, number of earthquakes per year, etc. (USGS)
Earthquakes, MegaQuakes, and the Movies — discussion about facts versus fantasies (USGS)
Echando Raices en Tierra de Terremotos — Este manual provee información sobre por qué nos deben preocupar los terremotos en el Sur de California, qué debemos hacer para estar seguros y reducir el daño, y también qué debemos saber de lo básico sobre terremotos. (USGS & many other organizations)
Putting Down Roots in Earthquake Country - NCA edition — Earthquakes and preparedeness in northern California (USGS & many other organizations)
Putting Down Roots in Earthquake Country - SCA edition — Earthquakes and preparedeness in southern California (USGS & Southern California Earthquake Center (SCEC))
Shake, Rattle, and Slide — Lessons, activities, and slide shows about earthquakes, volcanoes, and glaciers. (University of Illinois Extension)
Today in Earthquake History — what happened today in earthquake history (USGS)