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Marchena Island

Marchena

Vulcano a scudo · Ecuador · 343 m

A large tuff cone rises near Punta Calle on the southern coast of Marchena Island beyond fresh-looking lava flows west of the cone in the foreground. The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. In contrast to other Galápagos volcanoes, the 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. The first historical eruption of Marchena occurred in 1991.
A large tuff cone rises near Punta Calle on the southern coast of Marchena Island beyond fresh-looking lava flows west of the cone in the foreground. The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. In contrast to other Galápagos volcanoes, the 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. The first historical eruption of Marchena occurred in 1991. · Foto: Photo by Ed Vicenzi, 1984 (Smithsonian Institution). · Wikimedia Commons
Tipo
Vulcano a scudo
Paese
Ecuador
Regione
Eastern Pacific Volcanic Regions / Northern Galapagos Volcanic Province
Altitudine
343 m
Coordinate
0.330, -90.470
Ultima eruzione
1991
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The low shield volcano forming Marchena Island contains one of the largest calderas of the Galápagos Islands. The 6 x 7 km caldera and its outer flanks have been largely buried by a cluster of pyroclastic cones and associated lava flows. Its first historical eruption occurred in 1991. Other young lava flows, some of which may be only a few thousand, or even a few hundred years old, filled the caldera and flowed down its outer forested flanks, in some cases to the sea.

Sintesi da Wikipedia

Riassunto in inglese

Marchena Island is one of the Galapagos Islands in Ecuador. It has an area of 130 square kilometers (50 sq mi) and reaches an elevation of 343 meters (1,125 ft) above sea level. The island does not receive visitors, although the surrounding water is used by aquatic divers on organized tours. People generally see the island as they sail around the northern part of Isabela on the way to Genovesa Island.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1991~1991 · 1 eruzioni · VEI max. 219911991199219921992

Cronologia dettagliata

  1. 1991VEI 2Osservata
    1991-09-25 – 1991-11-16
    West to SW caldera rim

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.