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グラシオーザ島

Graciosa

成層火山 · Portugal · 402m

The south of Graciosa island is seen in this aerial view from the southwest. The village of Luz is at the center of the image. On the right (the southeast end of the island), is the 0.9 x 1.5 km Vulcão Central caldera, which formed between 60,000 and 11,000 years ago; the caldera rim forms the highest point of the 7 x 12 km island. The lava cave Furna Do Enzofre is situated in the southeastern part of the caldera, and exhibits fumarolic activity. Vegetated volcanic cones and part of the approximately 700,000 year old Serra das Fontes complex can be seen in the left of the photo.
The south of Graciosa island is seen in this aerial view from the southwest. The village of Luz is at the center of the image. On the right (the southeast end of the island), is the 0.9 x 1.5 km Vulcão Central caldera, which formed between 60,000 and 11,000 years ago; the caldera rim forms the highest point of the 7 x 12 km island. The lava cave Furna Do Enzofre is situated in the southeastern part of the caldera, and exhibits fumarolic activity. Vegetated volcanic cones and part of the approximately 700,000 year old Serra das Fontes complex can be seen in the left of the photo. · 写真: Photo by Angrense, 2007 (Wikimedia Commons). · Wikimedia Commons
タイプ
成層火山
国
Portugal
地域
Atlantic Ocean Volcanic Regions / Azores-Terceira Rift Volcanic Province
標高
402m
座標
39.020, -27.970
最終噴火
-1950年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Composite
主要岩石
Basalt / Picro-Basalt
地質学的概要

The SE end of Graciosa, the northernmost of the central Azorean islands, contains a 0.9 x 1.6 km caldera with active fumaroles. The SE caldera rim is the high point of the 7 x 12 km island. The caldera has been the source of eruptions producing significant tephra falls, pyroclastic flows, lahars, and lava flows. Fumaroles are present in a volcanic cave inside the caldera, and a submarine fumarole occurs off the NW coast. Scoria cones erupted along several widely spaced NE-SW-trending fissures fed a youthful lava field that forms the NW end of the island. The most recent eruption from Pico Tomao, NW of the caldera, produced a lava flow during the mid-to-late Holocene that reached the eastern coast NW of the village of Praia.

Wikipedia の要約

グラシオーザ島 （Graciosa、）は、ポルトガル、アゾレス諸島の島。諸島では2番目に小さい島であり、『白い島』として知られている。楕円形の島で、島全体が大きな成層火山である。島南部は、1.6kmの広さのカルデラのグラシオーザ・カルデラが占めている。グラシオーザにある自治体は、サンタ・クルス・ダ・グラシオーザ1つのみで、人口は4,780人（2001年）である。

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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
1950 BCE~1950 BCE · 1件 · 最大 VEI ?1950 BCE1950 BCE1949 BCE1949 BCE1949 BCE

詳細タイムライン

  1. 紀元前 1950年 (±1400年)VEI ?地質学的推定
    BCE 1950 ~ 進行中
    San Tamao

外部リンク

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