Hawaii Volcano Explainer

FILE - Volcanic ash and steam rises from Mount St. Helens, Wash., as it erupted, May 18, 1980. The ground is shaking and swelling at Mauna Loa, the largest active volcano in the world, indicating that it could erupt. Hawaii volcanoes like Mauna Loa tend not to have explosive eruptions like Mount St. Helens in Washington state.  That's because Hawaii's volcanoes have magma that's hotter, drier and more fluid, and doesn't trap as much gas, according to Hannah Dietterich, a research geophysicist at the U.S. Geological Survey's Alaska Volcano Observatory. (AP Photo/File) FILE PHOTO. 53739 TRANSPARENCIES

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