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Willekeurige foto 's
News
Tuesday, Nov 22, 2016
Volcanic Ash Advisory Center Toulouse (VAAC) issued the following report: ... [meer...]
 

Sete Cidades vulkaan

stratovolcano, caldera, pyroclastic cones 856 m
Azores, Portugal, Azores & Madeira, 37.86°N / -25.79°W
Current status: normal or dormant (1 out of 5) | Reports
Sete Cidades vulkaan boeken
Last update: 22 Aug 2019
Typical eruption style: Explosieve
Sete Cidades vulkaanuitbarstingen: 1500 AD
TijdMag. / DiepteAfstandLocatie
Thu, 17 Oct 2019
Thu, 17 Oct 03:21 UTCM 2.125 kmFossa Hirondelle (Portugal)
Sete Cidades volcano at the western end of Sao Miguel Island contains a 5-km-wide summit caldera, occupied by two caldera lakes, that is one of the scenic highlights of the Azores.

Background:

The steep-walled, 500-m-deep caldera was formed about 22,000 years ago, and at least 22 post-caldera eruptions have occurred. A large group of Pleistocene post-caldera trachytic lava domes, lava flows, and pyroclastic-flow deposits is found on the western-to-northern flanks. A nearly circular ring of six Holocene pyroclastic cones occupies the caldera floor. These have been the source of a dozen trachytic pumice-fall deposits erupted during the past 5000 years. Sete Cidades is one of the most active Azorean volcanoes. Historical eruptions date back to the 15th century and have occurred from within the caldera and from submarine vents off the west coast.
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Source: Smithsonian GVP

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