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Graciosa

Stratovolkan · Portugal · 402 m

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. · Foto: Photo by Angrense, 2007 (Wikimedia Commons). · Wikimedia Commons
Tipe
Stratovolkan
Negara
Portugal
Wilayah
Atlantic Ocean Volcanic Regions / Azores-Terceira Rift Volcanic Province
Ketinggian
402 m
Koordinat
39.020, -27.970
Letusan terakhir
-1950
Kondisi tektonik
Rift zone / Oceanic crust (< 15 km)
Bentuk lahan
Composite
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

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.

Ringkasan Wikipedia

Graciosa adalah sebuah pulau di Portugal. Pulau ini terletak di bagian Samudra Atlantik. Pulau Portugis berbentuk bulat memiliki luas 60,65 kilometer persegi, panjang 10 kilometer dan lebar 7 kilometer. Ini adalah pulau vulkanik, didominasi oleh kaldera pusat selebar 1,6 kilometer (Caldeira) yang terletak di tenggara.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
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1950 BCE~1950 BCE · 1 letusan · VEI maks. ?1950 BCE1950 BCE1949 BCE1949 BCE1949 BCE

Garis waktu rinci

  1. 1950 SM (±1400 tahun)VEI ?Perkiraan geologi
    BCE 1950 – Berlangsung
    San Tamao

Tautan eksternal

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