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The magmatic andesitic eruption of Arenal volcano on July 29–31, 1968, after centuries of dormancy, produced three new fissural craters (A, B and C) on its western flank and a multilayered pyroclastic deposit emplaced by complex transport mechanisms. The explosions were initially triggered by a volatile oversaturated (4–7 wt.% H 2 O) magma. Several lines of evidences suggest a small blast...
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