Hi All. I have often said I wished I were a microbe so I could go down into the faults and see what was there. Looks like I may not have to. Take Care…Don in creepy town

“In a pioneering effort, a team of government scientists has completed the first computerized maps of the upper 20 miles of the Earth beneath the San Francisco Bay Area, showing in a glance why earthquakes devastate some areas, while leaving others essentially unharmed.
The maps, prepared by the U.S. Geological Survey in Menlo Park and the California Geological Survey, display in graphic fashion what apparently happened when the Loma Prieta fault ruptured deep beneath the surface of the Santa Cruz Mountains in 1989.”

"In the old days we had paper maps that showed the surface," said Thomas Brocher, co-coordinator, with Mary Lou Zoback, for the USGS Northern California Earthquake Hazards Investigations group.”

"The problem is that sometimes rock types at the surface aren't very important. They don't show you what is below and there are important rock types that don't come to the surface, so they're not mapped," he said. "But they can have a big effect on what happens in an earthquake."

http://www.insidebayarea.com/sanmateocountytimes/localnews/ci_3299770

• Bay Area Faults