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This picture taken on April 21, 2013 shows a damaged building two days after an earthquake hit, in Ya'an City, southwest China's Sichuan province.  Thousands of rescue workers combed through flattened villages in southwest China in a race to find survivors from a powerful quake as the toll of dead and missing rose past 200.      CHINA OUT       AFP PHOTO        (Photo credit should read STR/AFP/Getty Images)
This picture taken on April 21, 2013 shows a damaged building two days after an earthquake hit, in Ya'an City, southwest China's Sichuan province.  Thousands of rescue workers combed through flattened villages in southwest China in a race to find survivors from a powerful quake as the toll of dead and missing rose past 200.      CHINA OUT       AFP PHOTO        (Photo credit should read STR/AFP/Getty Images)

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    Why large quakes keep occurring in China

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Why large quakes keep occurring in China

CNN's Mari Ramos explains why China and its surrounding region is prone to major earthquakes.

Why large quakes keep occurring in China

CNN's Mari Ramos explains why China and its surrounding region is prone to major earthquakes.