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El Hierro

Hierro

Vulcano a scudo · Spain · 1500 m

The massive El Hierro shield volcano is truncated by a large NW-facing escarpment, seen here, which formed as a result of gravitational collapse of the volcano. The steep-sided 1,500-m-high scarp towers above a low lava platform bordering 14-km-wide El Golfo Bay, which is barely visible at the extreme left. Holocene cones and flows are found both on the outer flanks and in the El Golfo depression. The latest subaerial eruption, during the 18th century, produced a lava flow from a cinder cone on the northwest side of El Golfo. A submarine eruption occurred in 2011-12 near the southern flank.
The massive El Hierro shield volcano is truncated by a large NW-facing escarpment, seen here, which formed as a result of gravitational collapse of the volcano. The steep-sided 1,500-m-high scarp towers above a low lava platform bordering 14-km-wide El Golfo Bay, which is barely visible at the extreme left. Holocene cones and flows are found both on the outer flanks and in the El Golfo depression. The latest subaerial eruption, during the 18th century, produced a lava flow from a cinder cone on the northwest side of El Golfo. A submarine eruption occurred in 2011-12 near the southern flank. · Foto: Photo by Yasuo Miyabuchi, 1997 (Forestry and Forest Products Research Institute, Kyushu). · Wikimedia Commons
Tipo
Vulcano a scudo
Paese
Spain
Regione
Northern Africa Volcanic Regions / Canary Volcanic Province
Altitudine
1500 m
Coordinate
27.730, -18.030
Ultima eruzione
2012
Contesto tettonico
Intraplate / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Trachybasalt / Tephrite Basanite
Sintesi geologica

The triangular island of Hierro is the SW-most and least studied of the Canary Islands. The massive shield volcano is truncated by a large NW-facing escarpment formed as a result of gravitational collapse of El Golfo volcano about 130,000 years ago. The steep-sided scarp towers above a low lava platform bordering 12-km-wide El Golfo Bay, and three other large submarine landslide deposits occur to the SW and SE. Three prominent rifts oriented NW, NE, and S form prominent topographic ridges. The subaerial portion of the volcano consists of flat-lying Quaternary basaltic and trachybasaltic lava flows and tuffs capped by numerous young cinder cones and lava flows. Holocene cones and flows are found both on the outer flanks and in the El Golfo depression. Hierro contains the greatest concentration of young vents in the Canary Islands. Uncertainty surrounds the report of an eruption in 1793. A submarine eruption took place about 2 km SSW off the southern point of the island during 2011-12.

Sintesi da Wikipedia

El Hierro soprannominata Isla del Meridiano è un'isola spagnola. È la più piccola e la più sud-occidentale di tutto l'arcipelago delle Isole Canarie, che si trova nell'Oceano Atlantico, lontano dalle coste africane. Il capoluogo dell'isola è Valverde.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
4790 BCE~4563 BCE · 1 eruzioni · VEI max. ?1163 BCE~936 BCE · 1 eruzioni · VEI max. ?709 BCE~483 BCE · 1 eruzioni · VEI max. ?1558~1784 · 2 eruzioni · VEI max. ?1784~2011 · 2 eruzioni · VEI max. 24790 BCE3203 BCE1389 BCE1971784

Cronologia dettagliata

  1. 2011VEI 2Osservata
    2011-10-10 – 2012-03-05
    Submarine S flank, Tagaro cone
  2. 1793VEI 0Stima geologica
    1793-05 – 1793-06
    NW rift (Volcán de Lomo Negro)?
  3. 1692VEI ?Stima geologica
    1692 – In corso
  4. 1677VEI ?Stima geologica
    1677 – In corso
  5. 550 a.C. (±75 anni)VEI ?Stima geologica
    BCE 550 – In corso
    Montañas Chamuscada-Entremontañas
  6. 950 a.C. (±150 anni)VEI ?Stima geologica
    BCE 950 – In corso
    East flank (Soliman)
  7. 4790 a.C.VEI ?Stima geologica
    BCE 4790 – In corso

Link esterni

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