It moves in fits and starts , sometimes sticking and sometimes slipping , sometimes here and sometimes there . Chile 's earthquake released 500 times more energy than Chile 's , says David Stark . Earthquake 's magnitude is related to movement of plates on earth 's crust , Stark says . Quake damage partly due to level of rainfall , and of building techniques , he says .
Chile 's earthquake released 500 times more energy than Chile 's , says David Stark . Earthquake 's magnitude is related to movement of plates on earth 's crust , Stark says . Quake damage partly due to level of rainfall , and of building techniques , he says .