Amerika Serikat · Stratovolkan
Seguam Island
Seguam
- Tipe
- Stratovolkan
- Ketinggian
- 1054 m
- Letusan terakhir
- 1993
- Tipe
- Stratovolkan
- Negara
- Amerika Serikat
- Wilayah
- Amerika Utara / Aleutian Ridge Volcanic Arc
- Ketinggian
- 1054 m
- Koordinat
- 52.315, -172.510
- Letusan terakhir
- 1993
- Kondisi tektonik
- Zona subduksi / Kerak menengah (15-25 km)
- Bentuk lahan
- Komposit
- Batuan utama
- Andesit / Andesit basaltik
Ringkasan geologi
The 11.5 x 24 km island of Seguam, between Amlia and Amukta Islands in the central Aleutians, contains two calderas with Holocene post-caldera cones. Growth of the basaltic-to-rhyolitic Wilcox volcano on the east side of the island during the late Pleistocene was followed by edifice collapse and an associated ignimbrite eruption about 9,000 years ago, leaving a caldera open to the west, inside which a rhyolitic cone was constructed. The 3 x 4 km westernmost caldera has a central scoria cone, Pyre Peak, which rises above the caldera rim and is the source of most of the reported eruptions. A very young basaltic field surrounds Pyre Peak, and lava flows partially fill the caldera and reach the southern coast. Older Holocene lava flows were erupted from vents within the eastern caldera, and a monogenetic Holocene cone forms Moundhill volcano on the eastern tip of the island.
Ringkasan Wikipedia
Ringkasan InggrisSeguam Island is a small volcanic island in the Andreanof Islands group in the Aleutian Islands of Alaska. The island is mountainous and oval shaped with a land area of 80.04 square miles (207.3 km2). It is 16 miles (26 km) long and 6.8 miles (10.9 km) wide.
Wikipedia · CC BY-SA · Baca artikel lengkap →
Riwayat letusan
13 tercatatGlosariumGaris waktu rinci
- 1993VEI 2Teramati1993-05-28 – 1993-08-31Near Pyre Peak
- 1992VEI 2Teramati1992-12-27 – 1992-12-30Pyre Peak (1.5 km south of summit)
- 1977VEI 1Teramati1977-03-06 – 1977-03-08Pyre Peak (2.5 km SE of summit)
- 1927VEI ?Metode tidak dinyatakan1927-07-02 – akhir tidak diketahui
- 1902VEI 3Teramati1902-07-02 – akhir tidak diketahui
- 1892VEI 3Teramati1892-04-15 – akhir tidak diketahui
- 1891VEI 2Teramati1891-12-16 – akhir tidak diketahui
- 1827VEI ?Metode tidak dinyatakan1827-07-02 – akhir tidak diketahui
- 1786VEI ?Teramati1786 – 1790
- 250 (±500 tahun)VEI ?Perkiraan geologi250 – akhir tidak diketahuiWest of Wilcox volcano
- 4050 SM (±4000 tahun)VEI 0Perkiraan geologi4050 SM – akhir tidak diketahuiW flank of cone in eastern caldera
- 5100 SM (±2000 tahun)VEI 0Perkiraan geologi5100 SM – akhir tidak diketahuiW flank of cone in eastern caldera
- 7300 SM (±2250 tahun)VEI 5Perkiraan geologi7300 SM – akhir tidak diketahuiWilcox volcano
Gunung api terdekat
Tautan eksternal
⚠ Untuk referensi saja. Bukan untuk tanggap darurat.