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Alatu

Aluto

Stratovulcano · Ethiopia · 2335 m

Alutu volcano lies between the light-brown Lake Mirrga (Lake Langano) to the S and green-blue Lake Zway to the N. Several craters are aligned along NNE-SSW and E-W fissures. Dark-colored obsidian lava flows erupted from craters along the fissures and descended the flanks in all directions. Although the age of the most recent eruption is not known, its eruptive products overlie recent basaltic lava flows to the W and strong fumarolic activity continues.
Alutu volcano lies between the light-brown Lake Mirrga (Lake Langano) to the S and green-blue Lake Zway to the N. Several craters are aligned along NNE-SSW and E-W fissures. Dark-colored obsidian lava flows erupted from craters along the fissures and descended the flanks in all directions. Although the age of the most recent eruption is not known, its eruptive products overlie recent basaltic lava flows to the W and strong fumarolic activity continues. · Foto: NASA International Space Station image ISS001-363-7, 2001 (http://eol.jsc.nasa.gov/). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Ethiopia
Regione
Eastern Africa Volcanic Regions / Main Ethiopian Rift Volcanic Province
Altitudine
2335 m
Coordinate
7.770, 38.780
Ultima eruzione
1550
Contesto tettonico
Rift zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Rhyolite
Sintesi geologica

Aluto, between lakes Zway and Langano (Mirrga), is a stratovolcano with multiple vents aligned along NNE-SSW and E-W fissures along a narrow graben between the two lakes. This silicic volcanic center lies along the regional Wonji Fault Belt and has produced abundant pumice-flow and pumice-fall deposits, along with lesser rhyolitic lava flows. Obsidian lava flows erupted from craters along the fissures have descended the flanks in all directions. Cinder cones, lava domes, phreatic explosion craters, and thermal springs are structurally controlled. The oldest known eruptions produced the Hulo-Seyno Ignimbrite about 155,000 years ago. The latest eruptions produced obsidian flows and pumice breccias about 2,000 years ago. Eruptive products overlie recent basaltic lava flows to the west. Strong fumarolic activity continues.

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
10900 BCE~10485 BCE · 1 eruzioni · VEI max. ?7580 BCE~7165 BCE · 1 eruzioni · VEI max. ?6335 BCE~5920 BCE · 1 eruzioni · VEI max. ?110 BCE~305 · 1 eruzioni · VEI max. ?1135~1550 · 1 eruzioni · VEI max. ?10900 BCE7995 BCE4675 BCE1770 BCE1135

Cronologia dettagliata

  1. 1550 (±50 anni)VEI ?Stima geologica
    1550 – In corso
    Tephra sample from E flank of edifice
  2. 50 a.C.VEI ?Stima geologica
    BCE 50 – In corso
  3. 6200 a.C. (±1680 anni)VEI ?Stima geologica
    BCE 6200 – In corso
    Tephra sample from Deka Wede (W of caldera)
  4. 7280 a.C. (±2000 anni)VEI ?Stima geologica
    BCE 7280 – In corso
    Tephra sample from Haroresa (S of caldera)
  5. 10900 a.C. (±1630 anni)VEI ?Stima geologica
    BCE 10900 – In corso
    Tephra sample from Deka Wede (W of caldera)

Link esterni

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