scientists at caltech have re- examined the historic seismic data using a new algorithm running on the supercomputer. they have identified nearly 2 million tiny earthquakes undetectable until now. usgs says this new tool will help the bay area too. >> we have the same problems of faults that connect to each other like h and the rodgers creek salt and we get better images of how they connect over the years. >> reporter: studying these micro quakes that happen almost round-the-clock deep underground, scientists believe this will lead to a better understanding of when a fault may snap. it is also useful for studying swarm. >> san ramon regularly has earthquakes forms. with ten times as much data we would be able to track them that much more accurately and do better forecast for the future. >> reporter: do these millions of small earthquakes reduce stress on major faults? >> if they were really important to releasing energy on the faults we need to have 30 times as many. >> reporter: you don't see them come you don't feel them but they may be the first clue to better understanding how and