There's more to see at Natural Bridges State Beach than the temporary natural bridge. It's a monument to the cultural as well as the geological past.
Everyone loves San Francisco, but geologists love it for reasons others don't, such as its gigantic slickenside.
Last week's deadly earthquake in Japan and last month's devastating temblor in New Zealand have put quake-prone California on alert. While Bay Area residents would rather not think about the possibility of another major quake, the region is surrounded by active faults. One East Bay fault has scientists especially concerned.
So we know- or should know- the seismic risks of living in one of the most vibrant, diverse places in the U.S. Short of leaving the region, what can we do?
Can earthquakes be predicted? Northern California researchers are now identifying the slow-moving clues that may foreshadow violent quakes. Their work may provide even a few seconds of warning to open elevator doors, slow down trains or alert firefighters.