Tuesday, November 23, 2004

The welt in the dome

The growth of the new lava dome in the crater of Mount St Helens continues to grow at an impressive rate. Arrays of GPS positioning sensors known as "Spiders" have been placed on the growing dome and show a southeastward movement at a rate of about 10 meters (33 feet) per day! Indicating a sustained and continued outpouring of lava to form this impressive structure - the source of the incandescent glow that illuminates the crater at night.


Source: USGS/Cascades Volcano Observatory, Vancouver, Washington. November 20, 2004, photograph by Jeff Marso

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