本文へスキップ
← 地図に戻る
⇄ 比較

サンチャゴ島

Santiago

楯状火山 · Ecuador · 920m

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. · 写真: Photo by Lee Siebert, 1978 (Smithsonian Institution). · Wikimedia Commons
タイプ
楯状火山
国
Ecuador
地域
東太平洋 / Galapagos Hotspot Volcano Group
標高
920m
座標
-0.220, -90.770
最終噴火
1906年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Shield
主要岩石
Basalt / Picro-Basalt
地質学的概要

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.

Wikipedia の要約

英語版の要約

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.

Wikipedia · CC BY-SA · 記事全文を読む →

噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
1759~1774 · 1件 · 最大 VEI ?1890~1904 · 2件 · 最大 VEI 017591788183218611890

詳細タイムライン

  1. 1904年VEI 0観測記録
    1904-07-02 ~ 1906-12-15
    SE flank
  2. 1897年VEI 0観測記録
    1897-07-02 ~ 進行中
    SE flank (Sullivan Bay?)
  3. 1759年 (±75年)VEI ?地質学的推定
    1759 ~ 進行中
    West flank (James Bay)

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。