Portugal · Stratovolkan
Sete Cidades Massif
Sete Cidades
- Tipe
- Stratovolkan
- Ketinggian
- 842 m
- Letusan terakhir
- 1880
- Tipe
- Stratovolkan
- Negara
- Portugal
- Wilayah
- Samudra Atlantik / Azores-Terceira Rift Volcanic Province
- Ketinggian
- 842 m
- Koordinat
- 37.865, -25.785
- Letusan terakhir
- 1880
- Kondisi tektonik
- Zona rift / Kerak samudra (< 15 km)
- Bentuk lahan
- Komposit
- Batuan utama
- Trakit / Trakidasit
Ringkasan geologi
Sete Cidades volcano at the western end of Sao Miguel Island contains a 5-km-wide summit caldera occupied by two caldera lakes. 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 on the caldera floor have been the source of a dozen trachytic pumice-fall deposits erupted during the past 5,000 years. Recorded eruptions date back to the 15th century and have occurred both within the caldera and from submarine vents off the west coast.
Ringkasan Wikipedia
Ringkasan InggrisSete Cidades Massif is a stratovolcanic complex, referring to a polygenetic volcano and caldera, located in western part of the island of São Miguel, in the Portuguese archipelago of the Azores. More recognizable for the Lagoa das Sete Cidades at its centre, the volcanic complex includes centuries of geomorphological structures that include lava domes, cones, lava flows and maar geomorphology that have marked its history.
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Riwayat letusan
16 tercatatGlosariumGaris waktu rinci
- 1880VEI 0Metode tidak dinyatakan1880-07-02 – akhir tidak diketahuiVolcano Uncertain: submarine vent off Sao Miguel
- 1861VEI 0Metode tidak dinyatakan1861-07-02 – akhir tidak diketahuiVolcano Uncertain: submarine vent off Sao Miguel
- 1811VEI 2Teramati1811-02-01 – 1811-02-08Submarine vent west of Sete Cidades
- 1811VEI 3Teramati1811-06-14 – 1811-06-22Submarine vent west of Sete Cidades
- 1713VEI 2Teramati1713 – akhir tidak diketahuiWest flank (Pico das Camarinhas)
- 1682VEI 2Teramati1682-12-13 – akhir tidak diketahuiSubmarine vent west of Sete Cidades
- 1638VEI 2Teramati1638-07-03 – 1638-07-28Submarine vent west of Sete Cidades
- 1444VEI 4Teramati1444 – akhir tidak diketahuiSW side of caldera (Caldeira Seca)
- 1110 (±50 tahun)VEI 2Perkiraan geologi1110 – akhir tidak diketahuiWest flank (Ponta de Ferraria)
- 950 (±100 tahun)VEI 2Perkiraan geologi950 – akhir tidak diketahuiSE flank (Ferraria)
- 670 (±150 tahun)VEI 3Perkiraan geologi670 – akhir tidak diketahuiSE flank (Carvao)
- 380 (±300 tahun)VEI 4Perkiraan geologi380 – akhir tidak diketahuiSE caldera floor (Lagoa Rasa)
- 90 (±100 tahun)VEI 4Perkiraan geologi90 – akhir tidak diketahuiSE caldera floor (Lagoa de Santiago)
- 750 SM (±300 tahun)VEI ?Perkiraan geologi750 SM – akhir tidak diketahuiSE flank (Eguas)
- 2050 SM (±1000 tahun)VEI ?Perkiraan geologi2050 SM – akhir tidak diketahuiCaldeira do Alfreres and NW flank
- 3050 SMVEI 4Perkiraan geologi3050 SM – akhir tidak diketahuiSeara Cerrado da Ladeira
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