Estados Unidos · Estratovolcán
Seguam Island
Seguam
- Tipo
- Estratovolcán
- Altitud
- 1054 m
- Última erupción
- 1993
- Tipo
- Estratovolcán
- País
- Estados Unidos
- Región
- América del Norte / Aleutian Ridge Volcanic Arc
- Altitud
- 1054 m
- Coordenadas
- 52.315, -172.510
- Última erupción
- 1993
- Contexto tectónico
- Zona de subducción / Corteza intermedia (15-25 km)
- Forma volcánica
- Compuesto
- Roca principal
- Andesita / Andesita basáltica
Resumen geológico
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.
Resumen de Wikipedia
Resumen en inglésSeguam 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.
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Historial de erupciones
13 registradasGlosarioLínea de tiempo detallada
- 1993VEI 2Observado1993-05-28 – 1993-08-31Near Pyre Peak
- 1992VEI 2Observado1992-12-27 – 1992-12-30Pyre Peak (1.5 km south of summit)
- 1977VEI 1Observado1977-03-06 – 1977-03-08Pyre Peak (2.5 km SE of summit)
- 1927VEI ?Método no indicado1927-07-02 – fin desconocido
- 1902VEI 3Observado1902-07-02 – fin desconocido
- 1892VEI 3Observado1892-04-15 – fin desconocido
- 1891VEI 2Observado1891-12-16 – fin desconocido
- 1827VEI ?Método no indicado1827-07-02 – fin desconocido
- 1786VEI ?Observado1786 – 1790
- 250 (±500 años)VEI ?Estimación geológica250 – fin desconocidoWest of Wilcox volcano
- 4050 a. C. (±4000 años)VEI 0Estimación geológica4050 a. C. – fin desconocidoW flank of cone in eastern caldera
- 5100 a. C. (±2000 años)VEI 0Estimación geológica5100 a. C. – fin desconocidoW flank of cone in eastern caldera
- 7300 a. C. (±2250 años)VEI 5Estimación geológica7300 a. C. – fin desconocidoWilcox volcano
Volcanes cercanos
Enlaces externos
⚠ Solo como referencia. No apto para respuesta ante emergencias.