Reasons to worry: Santa María's last big blast was one of the four largest volcaniceruptions in the 20th century, registering a VEI magnitude of 6 and leaving a 700-by-1,000 meter craterbehind.

列入关注的理由： 20世纪四次最大规模的火山爆发，圣塔玛里亚就占了一次，记录的火山爆发指数(VEI)为6级，留下了一个直径为700-1000米的火山口。

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The blast littered the suburban street with debris and left a one-meter-deep crater in the asphalt.

这条位于市郊的街道上散布着爆炸留下的残骸，并在柏油路上留下一个一米深的弹坑。

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The blast, which occurred on Friday morning, caused the collapse of a 30-meter-high expressway viaduct in Mianchi County, Sanmenxia City.

爆炸事故于周五早上发生，造成三门峡市渑池县境内30米高的大桥坍塌。

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After finally gaining permission to carry out the explosion, the boat was anchored in a 200 meter exclusion zone and Royal Navy explosives experts were enlisted to set up the blast.

CNN: November 21, 2012 -- Updated 1203 GMT (2003 HKT)