07.09.2009 - Tremors on southern San Andreas Fault may mean increased quake risk

07.09.2009 - Tremors on southern San Andreas Fault may mean increased quake risk: "BERKELEY — Increases in mysterious underground tremors observed in several active earthquake fault zones around the world could signal a build-up of stress at locked segments of the faults and presumably an increased likelihood of a major quake, according to a new University of California, Berkeley, study."