scientist at caltech in southern california have re- examined historic seismic data, using a new algorithm running on a supercomputer. they identified nearly 2 million tiny earthquakes, undetected until now. micro quakes. usg says this new tool will help the bay area as well. >> we have the same problems, of faults that connect to each other like the hayward and rogers creek fall, were getting better images on how they connect over the years. same for hayward and calaveras falls >> faults. >> it happened almost around the clock underground and scientists believe this will lead to a better understanding of when a fault may snap. it also was useful for studying swarms. >> we usually have earthquake swarms and san ramon with 10 times as much data we can track them accurately and you better forecasts on how they are behaving. >> duties millions of small earthquakes help reduce stress on the major faults? >>it's important to release energy on the faults if we do we need 30 times as many. >> you don't feel them or see them but they may be the first clue to understand the how and why of earthquak