USGS - Earthquake information on the web

The USGS (United States Geological Survey) has all sorts of interesting stuff at its earthquake information pages.

There are, for instance, animations that move through the last week's earthquake maps, showing, in other words, not only where earthquakes hit, but in what order. You can choose among a variety of settings, from a whole world view to, say, the San Francisco Bay area, or the Los Angeles area, or Yellowstone, among others.

There's a map that registers earthquakes over the last 8 to 30 days, sorted by depth, so you can see where the most activity has been.

There's even a page that attempts to forecast California aftershocks.

And much more.

Just in case you're interested in that sort of stuff.