fissure

ALASKA VOLCANO OBSERVATORY GLOSSARY
Elongated fractures or cracks on the slopes of a volcano. Fissure eruptions typically produce liquid flows, but pyroclastics may also be ejected.
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USGS PHOTO GLOSSARY OF VOLCANIC TERMS
In geology, a fissure is a fracture or crack in rock along which there is a distinct separation; fissures are often filled with mineral-bearing materials. On volcanoes, a fissure is an elongate fracture or crack at the surface from which lava erupts. Fissure eruptions typically dwindle to a central vent after a period of hours or days. Occasionally, lava will flow back into the ground by pouring into a crack or an open eruptive fissure, a process called drainback; sometimes lava will flow back into the same fissure from which it erupted.
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Photograph by S.R. Brantley on 14 August 1998
Eruptive fissure on southeast rim of Kilauea caldera, Hawai`i. This eruptive fissure was active briefly during an eruption in July 1974. Note prominent spatter ramparts on right, and subdued rampart on left, built by the ejection of lava along the fissure. The smooth texture of the surface on the lip of the fissure (lower right) is evidence that lava drained back into the fissure toward the end of the 1974 eruption.

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

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  • fissure — [ fisyr ] n. f. • 1314, rare av. XVIIIe; lat. fissura, de fissus, p. p. de findere « fendre » ♦ Petite fente. ⇒ cassure, crevasse, scissure. Fissure d un mur, d une cloison. ⇒ lézarde. « Un encadrement que le temps avait rayé par des fissures… …   Encyclopédie Universelle

  • Fissure — Fis sure, n. [L. fissura, fr. findere, fissum, to cleave, split; akin to E. bite: cf. F. fissure.] A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock. [1913 Webster] {Cerebral fissures} (Anat.), the furrows …   The Collaborative International Dictionary of English

  • fissure — c.1400, from O.Fr. fissure (13c.) and directly from L. fissura a cleft, from root of findere to split, cleave, from PIE *bhi n d , from root *bheid to split (Cf. Skt. bhinadmi I cleave, O.H.G. bizzan to bite, O.E. bita a piece bitten off, mo …   Etymology dictionary

  • fissure — [fish′ər] n. [ME < OFr < L fissura < fissus: see FISSION] 1. a long, narrow, deep cleft or crack 2. a dividing or breaking into parts 3. Anat. a groove between lobes or parts of an organ, as in the brain 4. Med. a break or ulceration… …   English World dictionary

  • Fissure — Fis sure, v. t. To cleave; to divide; to crack or fracture. [1913 Webster] …   The Collaborative International Dictionary of English

  • Fissure — Fissure. См. Волосная трещина. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • fissure — index break (fracture), force (break), part (separate), rift (gap), sever …   Law dictionary

  • fissure — Crack, cleft, crevasse, crevice, cranny, chink Analogous words: *break, gap: *breach, split, rent, rupture, rift …   New Dictionary of Synonyms

  • fissure — ► NOUN ▪ a long, narrow crack. ► VERB ▪ split; crack. ORIGIN Latin fissura, from findere to split …   English terms dictionary

  • Fissure — In anatomy, fissure (Latin fissura , Plural fissurae ) is a groove, natural division, deep furrow, cleft, or tear in various parts of the body.AnatomyVarious types of anatomical fissure are:Brain* Fissure of Bichat : found below the corpus… …   Wikipedia

  • fissure — (fi ssu r ) s. f. 1°   Petite fente, crevasse. Les fissures d un mur, d un vase, d un terrain. La lumière pénétrait par une fissure de la cloison.    Fig. •   Je sais que, malgré les barrières immenses qu on entasse sans cesse autour de moi, on… …   Dictionnaire de la Langue Française d'Émile Littré


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