23 May '11, 7pm

The eruption of Iceland’s Grímsvötn Volcano as seen by our Terra satellite. Looking down the ash plume.

About 14 months after Eyjafjallajökull rumbled to life, another volcano on Iceland began spewing ash and steam. At approximately 17:30 UTC (5:30 p.m. local time) on May 21, 2011, Grímsvötn began to erupt, the Icelandic Met Office reported. The volcano sent a plume of volcanic ash and steam about 20 kilometers (12 miles) above sea level. Overnight, the plume height dropped to 15 kilometers (9 miles), but occasionally re-approached its initial altitude. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image at 13:00 UTC (1:00 p.m. local time) on May 22, 2011. (MODIS on NASA’s Aqua satellite captured another image of the volcano a little over two hours later.) Above Grímsvötn’s summit, volcanic ash forms a roughly circular plume that towers above the surrounding clouds. In the southeast, ash has colored the snow s...

Full article: http://earthobservatory.nasa.gov/NaturalHazards/view.php?...

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