The Mudcat Café TM
Thread #110534 Message #2321111
Posted By: Slag
20-Apr-08 - 08:40 PM
Thread Name: BS: you don't often get to see an earthquake
Subject: RE: BS: you don't often get to see an earthquake
I wouldn't doubt it if someone announced that the steam injection was the cause of so many micro quakes. Who knows. We look for cracks in the paint and tiles and hope that with so much shaking the pressures beneath are relieved. This area had only minor damage from the 1806 quake that devastated SF and Santa Rosa (110 and 60 miles south, respectively). Yup! The water heater is anchored and the nick knacks have "museum gel" holding them down.
The New Madrid situation is much scarier. You're right. The mechanism there is not well understood and the type of quake that has occurred in the past is the sort where the ground opens up and swallows things. The process of liquefaction in the layering causes "sand geysers" and quicksand situations. Ours are "slidey faults, kind of a north/south deal. New Madrid is up/down or maybe just down!
You can check with the USGS on line. They have general info about quake preparedness and they WILL answer your questions about your specific area and what additional precautions you should take.