GEOEYE / SCIENCE PHOTO LIBRARY GEOEYE / SCIENCE PHOTO LIBRARY
Mount St Helens. Satellite image of the summit of the Mount St Helens volcano, in Washington State, USA. The summit crater (centre, 2 kilometres wide and 640 metres deep) was formed during a massive volcanic eruption on 18 May 1980, following months of volcanic activity. The bulging northern face of the volcano collapsed and a massive pyroclastic flow erupted northwards (towards top), leaving a massive gap in the crater that formed. The volcano was reduced in height by 400 metres, hundreds of square kilometres of forest were destroyed and 57 people died. A post-eruption lava dome (centre) formed in the crater. Image taken by the Ikonos satellite on 13 September 2003.
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