lateral blast

GLOSSARY OF VOLCANIC TERMS
A volcanic eruption which is directed horizontally instead of vertically. Lateral blasts may be caused by sudden decompression of a shallow magma chamber residing within the flanks of a volcano (for example, the 1980 eruption of Mt. St. Helens), or along the base or side of a lava dome (for example, the 1902 eruption of Mt. Pelee in Martinique)(Nakada, 2000, p. 945).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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