Mount Roundtop
Roundtop
成層火山 · United States · 1871m
- タイプ
- 成層火山
- 国
- United States
- 地域
- North America Volcanic Regions / Aleutian Ridge Volcanic Arc
- 標高
- 1871m
- 座標
- 54.800, -163.589
- 最終噴火
- -7600年
- テクトニクス環境
- Subduction zone / Continental crust (> 25 km)
- 火山地形
- Composite
- 主要岩石
- Rhyolite
地質学的概要
The flat-topped, glacier-covered Roundtop is the easternmost and lowest of an E-W-trending line of volcanoes on eastern Unimak Island, 13 km SW of the village of False Pass. The snow and ice-covered edifice fills much of a 3-km-wide caldera that formed during the early Holocene. The caldera-forming eruption produced pyroclastic flows and a rhyolitic tephra layer that is widespread throughout the southwestern end of the Alaska Peninsula. A group of lava domes was constructed south of the volcano. No historical eruptions are known, but in the 1930's warm springs were found on its slopes.
Wikipedia の要約
英語版の要約Roundtop Mountain is a stratovolcano located on the Aleutian island of Unimak in the U.S. state of Alaska. Its last eruption was sometime between 9,100 and 10,000 years ago. This geographic feature was first called "Dome" in 1897 by Lieutenant Commander J. F. Moser, of the U.S. Navy. Its name was reported as "Round Top" by the United States Coast and Geodetic Survey in 1902. Isanotski Peaks, the nearest higher neighbor, is positioned 5.9 mi (9 km) to the west-southwest.
Wikipedia · CC BY-SA · 記事全文を読む →
噴火履歴
詳細タイムライン
- 紀元前 7600年 (±500年)VEI 5地質学的推定BCE 7600 ~ 進行中
外部リンク
⚠ 参考情報です。緊急対応には使用しないでください。