Thursday, October 1, 2009

Can a Large Earthquake Trigger Global Seismic Activity?

Indonesian Quake 9/30/09

In case you've been wondering just that as multiple Ring of Fire Earthquakes occur this week:

Click here for a World Map of this week's Earthquakes.

"U.S. seismologists have found evidence that the massive 2004 earthquake that triggered killer tsunamis throughout the Indian Ocean weakened at least a portion of California's famed San Andreas Fault. The results, which appeared in the journal Nature, suggest that the Earth's largest earthquakes can weaken fault zones worldwide and may trigger periods of increased global seismic activity."

Click here for details.

Click here for another article on how large quakes trigger more smaller quakes.

AND AS ALWAYS! I hope you are having your students chart worldwide earthquakes and volcanic eruptions during your school year! Take a few moments once a week to chart the week's tectonic activity. This one activity can unify many of your Earth Science course objectives!