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Santiago Island

Santiago

Vulcano a scudo · Ecuador · 920 m

The elongated shield volcano of Santiago Island is dotted with Holocene pyroclastic cones. Fresh lava flows that blanket the flanks of the volcano originated from these cones. The 920-m-high summit ridge, lined with NW-trending cinder and spatter cones, is seen here from James Bay on the west side of the island. The James Bay lava flows (center) reached the coast along a broad front. They were dated by fragments of marmalade pots left by buccaneers in 1684 that were subsequently embedded in the lava flows observed by Charles Darwin in 1835.
The elongated shield volcano of Santiago Island is dotted with Holocene pyroclastic cones. Fresh lava flows that blanket the flanks of the volcano originated from these cones. The 920-m-high summit ridge, lined with NW-trending cinder and spatter cones, is seen here from James Bay on the west side of the island. The James Bay lava flows (center) reached the coast along a broad front. They were dated by fragments of marmalade pots left by buccaneers in 1684 that were subsequently embedded in the lava flows observed by Charles Darwin in 1835. · Foto: Photo by Lee Siebert, 1978 (Smithsonian Institution). · Wikimedia Commons
Tipo
Vulcano a scudo
Paese
Ecuador
Regione
Eastern Pacific Volcanic Regions / Galapagos Hotspot Volcano Group
Altitudine
920 m
Coordinate
-0.220, -90.770
Ultima eruzione
1906
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The elongated shield volcano of Santiago Island, also known as San Salvador Island or James Island, has numerous scattered Holocene pyroclastic cones. Fresh-looking lava flows from these cones cover the flanks. The summit ridge, lined with a chain of NW-trending cinder and spatter cones, is located at the NW end of the island. Prominent flank tuff cones occur at the western and eastern coasts. The most recent activity has been concentrated at the NW and SE ends of the island. The pahoehoe lava flows at James and Sullivan Bays, on opposite ends of the island, were erupted in the past few hundred years. The James Bay flows were dated by fragments of marmalade pots left by buccaneers in 1684 that were subsequently embedded in the lava flows described by Charles Darwin in 1835.

Sintesi da Wikipedia

Riassunto in inglese

Santiago Island is one of the Galápagos Islands. The island, which consists of two overlapping volcanoes, has an area of 585 square kilometers (226 mi2) and a maximum altitude of 907 meters (2,976 ft), atop the northwestern shield volcano. The volcano in the island's southeast erupted along a linear fissure and is much lower. The oldest lava flows on the island date back to 750,000 years ago.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1759~1774 · 1 eruzioni · VEI max. ?1890~1904 · 2 eruzioni · VEI max. 017591788183218611890

Cronologia dettagliata

  1. 1904VEI 0Osservata
    1904 – 1906-12-15
    SE flank
  2. 1897VEI 0Osservata
    1897 – In corso
    SE flank (Sullivan Bay?)
  3. 1759 (±75 anni)VEI ?Stima geologica
    1759 – In corso
    West flank (James Bay)

Link esterni

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