A phreatic explosion at its margins formed the Nina Encantada lake.
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The lake may be a landslide scar, or a crater left by a phreatic explosion.
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Eruptions are typically phreatic explosions of small-to-moderate size that produce minor ash falls near the volcano.
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North of these, a phreatic explosion blasted out the crater which is today occupied by Blue Lake.
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Kilauea, in Hawaii, has a long record of phreatic explosions; a 1924 phreatic eruption hurled rocks estimated at eight tons up to a distance of one kilometer.
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King's Bowl is a phreatic explosion pit long, wide, and deep, caused by lava meeting groundwater and producing a steam explosion 2, 200 years ago . ( NPS photo)
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The first phreatic explosion in this new period of activity occurred on 21 August 1995, and such activity lasted for 18 weeks until it caused an andesitic lava dome formation.
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Mammoth Mountain first erupted violently some 200, 000 years ago, and large " phreatic explosions " of steam _ created when hot magma boils groundwater near the surface _ have left deep pits as relics of eruptions that occurred as recently as 200 to 500 years ago.
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When cold ground or surface water come into contact with hot rock or magma it superheats and explodes, fracturing the surrounding rock The distinguishing feature of phreatic explosions is that they only blast out fragments of pre-existing solid rock from the volcanic conduit; no new magma is erupted.
10.
Rainier's closest neighbor, Mount St . Helens'had a huge chunk of the side of the mountain blow up in a phreatic explosion caused by a mix of gas and water; where St . Helens was once perfectly symmetrical there is now, thirty five years later, a huge crater at the top of one face.
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