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Paramilitary policemen search for victims amongst collapsed houses after a 6.6 magnitude earthquake hit Minxian county, Dingxi, Gansu province, July 22, 2013. REUTERS/Stringer ( QUAKE-CHINA/TOLL )

A man who lost his son is supported by others after a 6.6 magnitude earthquake hit Minxian county, Dingxi, Gansu province July 22, 2013. TREUTERS/China Daily ( QUAKE-CHINA/TOLL )

A man feeds water to an injured woman on a stretcher after a 6.6 magnitude earthquake hit Minxian county, Dingxi, Gansu province July 22, 2013. REUTERS/China Daily ( QUAKE-CHINA/TOLL )

A woman points at her collapsed home after a 6.6 magnitude earthquake hit Minxian county, Dingxi, Gansu province, July 22, 2013. REUTERS/Stringer ( QUAKE-CHINA/TOLL )

Nurses support an injured woman who is taken to a hospital in Minxian county, Dingxi, Gansu province, July 22, 2013. REUTERS/China Daily ( QUAKE-CHINA/TOLL )

Residents injured in the earthquake receive medical treatment at a camp in Meichuan town in Minxian county of Dingxi city in northwest China's Gansu province on Monday, July 22, 2013. (AP Photo) ( China Earthquake )

People stand next to a collapsed house after an earthquake struck Minxian county of Dingxi, Gansu province July 22, 2013. REUTERS/China Daily ( QUAKE-CHINA/TOLL )

Firefighters carry an injured woman on a stretcher after a 6.6 magnitude earthquake hit Minxian county, Dingxi, Gansu province July 22, 2013. REUTERS/China Daily ( QUAKE-CHINA/TOLL )

A bout that used to be on the edge of the road sits in the harbor where the land fell into the sea at the Port Wellington Container terminal caused by yesterdays earthquake on July 22, 2013. Wellington city was hilt by a 6.5 magnitude earthquake on Sunday afternoon at 5.06pm on July 21 causing medium damage to the city. AFP PHOTO / MARTY Melville/AFP/Getty Images ( 521547393 )

A man holds a baby after a 6.6 magnitude earthquake in Minxian county, Dingxi, Gansu province, July 22, 2013. REUTERS/Stringer ( QUAKE-CHINA/TOLL )

A man walks past a collapsed house after a 6.6 magnitude earthquake in Minxian county, Dingxi, Gansu province, July 22, 2013. REUTERS/Stringer ( QUAKE-CHINA/TOLL )

Photo shows quake-hit Baiyangpo village on July 22, 2013 in Minxian, China. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) ( 174223237 )

An injured man receives treatment at a hospital in Minxian county, Dingxi, Gansu province July 22, 2013.REUTERS/China Daily ( QUAKE-CHINA/TOLL )

Chinese women look at a person injured by an earthquake resting on a bed at a hospital in Minxian county in Dingxi city in northwest China's Gansu province on Monday, July 22, 2013. (AP Photo) ( China Earthquake )

An injured resident is attended to by medical workers on the grounds of a hospital after an earthquake hit Minxian county in northwest China's Gansu province Monday July 22, 2013. (AP Photo) ( China Earthquake )

Medical workers attend to an injured at a hospital after an earthquake hit Minxian county in northwest China's Gansu province Monday July 22, 2013. (AP Photo) ( China Earthquake )

In this photo released by Xinhua News Agency, rescuers clear the debris of a damaged house in quake-hit Majiagou Village of Minxian County, northwest China's Gansu Province, Monday, July 22, 2013. (AP Photo/Xinhua, Guo Gang) NO SALES ( China Earthquake )

In this July 22, 2013 photo released by Xinhua News Agency, a damaged house stands in rubble following an earthquake that hit Majiagou Village of Minxian County, northwest China's Gansu Province. (AP Photo/Xinhua, Tu Guoxi) ( China Earthquake )

Residents light candles that form the words "Dingxi July 22" while holding up the characters "Gansu, Dingxi, Go on! Best wishes" during a candlelight vigil for victims of the morning's earthquake that hit northwest China's Gansu province in Loudi city in south China's Hunan province Monday July 22, 2013. (AP Photo) ( China Earthquake )

Residents gather at a makeshift on the grounds of a hospital for medical services after an earthquake hit Minxian county in northwest China's Gansu province Monday July 22, 2013. (AP Photo) ( China Earthquake )

Chinese paramilitary policemen helps residents remove belongings from quake damaged houses in Lalu village of Hetuo township in Minxian in northwest China's Gansu province Monday July 22, 2013. (AP Photo) ( China Earthquake )