• n  a tremor preceding an earthquake

News & Articles

• 'Top Two' impact already felt
  One in every eight or nine earthquakes is followed by an even more powerful aftershock, officially making the first quake into a foreshock.
  Feb. 25, 2014 - The Salinas Californian

Quotes

• Kate Hutton in San Diego Union Tribune
  Anytime we have an earthquake anywhere, there's a chance it's a foreshock to something larger,said Kate Hutton, a seismologist at the California Institute of Technology in Pasadena.
• Susan Hough in Los Angeles Times
  We don't know for sure, but there's pretty good evidence that the last Big One started up there,Hough said. "So it's always been in the back of people's minds that maybe a moderate quake at Parkfield could be the foreshock to the next Big...