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Sete Cidades volcano

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 volcano books | Tours
Last update: 22 Aug 2019
Typical eruption style: Explosive
Sete Cidades volcano eruptions: 1500 AD
TimeMag. / DepthDistanceLocation
Wed, 14 Oct 2020 (UTC)
14 Oct 12:42 pm (GMT +0) (14 Oct 12:42:30 UTC)M 2.323 kmFossa Hirondelle, Portugal
Thu, 1 Oct 2020 (UTC)
1 Oct 3:38 pm (GMT +0) (1 Oct 15:38:02 UTC)M 2.924 kmFossa Hirondelle, Portugal
Thu, 1 Oct 03:34 UTCM 1.412 kmW Varzea (S. Miguel), Portugal
Thu, 24 Sep 2020 (UTC)
24 Sep 9:12 pm (GMT +0) (24 Sep 21:12:36 UTC)M 2.228 kmFossa Hirondelle, Portugal
Mon, 22 Jun 2020 (UTC)
Mon, 22 Jun 04:05 UTCM 2.029 kmFossa Hirondelle (Portugal)
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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.


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.
Source: Smithsonian GVP

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