PHOTOS: How Humans Can Trigger Earthquakes

PHOTOS: How Humans Can Trigger Earthquakes
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February 10, 2009-- A massive earthquake leveled buildings--including swaths of the town of Yingxiu, seen above on May 26, 2008--and killed roughly 80,000 people in China's Sichuan Province in May 2008. A new study says that yo-yoing weight of water behind China's Zipingpu Dam could be to blame for the magnitude 7.9 earthquake.

The Sichuan quake is only the latest in a swarm of possibly human-influenced earthquakes that experts say have struck in the past 60 years.

What follows are some of the ways scientists think human activities can trigger temblors.

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—Photograph by Oded Balilty/AP
 
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