Philly area feels impact from Japan quake

The first pressure waves from last Friday's earthquake off the coast of Japan traveled across the earth and reached the east coast of the U.S. in 13 minutes. There was so much energy released in these waves that it caused the Philadelphia region to raise about an inch before slowly settling back down, said Temple earth and environmental science professor Jonathan Nyquist. He said the inch rise was calculated by colleagues at Columbia, based on readings from instruments like the seismometer stationed at Temple's Ambler Campus. "The whole surface of the Earth rings when one of these things goes off."
March 13, 2011 | Philadelphia Inquirer