Warning signs? ‘Silent Earthquakes’ ripple under Cascadia

Warning signs? ‘Silent Earthquakes’ ripple under Cascadia: "October 6, 2012 –WASHINGTON - Parts of Washington and Oregon are in the midst of silent earthquakes this week. You can’t feel this so-called “slow slip” quake and it doesn’t cause damage. Still, scientists want to learn more about the recently discovered phenomenon. Little is certain so far, but there’s a possibility these deep tremors could trigger a damaging earthquake or serve as a warning bell for the Big One."