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スパー山

Spurr

成層火山 · United States · 3374m

During the late Pleistocene or early Holocene Mount Spurr underwent flank collapse, resulting in the 5-6 km crater that opens to the south shown here in 1993. The collapse produced a debris avalanche that traveled at least 25 km from the summit. The snow-covered peak (center) is a post-collapse lava dome. Crater Peak, in front of it, has been the source of frequent Holocene eruptions.
During the late Pleistocene or early Holocene Mount Spurr underwent flank collapse, resulting in the 5-6 km crater that opens to the south shown here in 1993. The collapse produced a debris avalanche that traveled at least 25 km from the summit. The snow-covered peak (center) is a post-collapse lava dome. Crater Peak, in front of it, has been the source of frequent Holocene eruptions. · 写真: Photo by Christina Neal, 1993 (U.S. Geological Survey, Alaska Volcano Observatory). · Wikimedia Commons
タイプ
成層火山
国
United States
地域
North America Volcanic Regions / Alaska Peninsula Volcanic Arc
標高
3374m
座標
61.299, -152.251
最終噴火
1992年
テクトニクス環境
Subduction zone / Continental crust (> 25 km)
火山地形
Composite
主要岩石
Andesite / Basaltic Andesite
地質学的概要

Mount Spurr is the closest volcano to Anchorage, Alaska (130 km W) and just NE of Chakachamna Lake. The summit is a large lava dome at the center of a roughly 5-km-wide amphitheater open to the south formed by a late-Pleistocene or early Holocene debris avalanche and associated pyroclastic flows that destroyed an older edifice. The debris avalanche traveled more than 25 km SE, and the resulting deposit contains blocks as large as 100 m in diameter. Several ice-carved post-collapse cones or lava domes are present. The youngest vent, Crater Peak, formed at the southern end of the amphitheater and has been the source of about 40 identified Holocene tephra layers. Eruptions from Crater Peak in 1953 and 1992 deposited ash in Anchorage.

Wikipedia の要約

英語版の要約

Mount Spurr (Dena'ina: K'idazq'eni) is a stratovolcano in the Aleutian Arc of Alaska, named after United States Geological Survey geologist and explorer Josiah Edward Spurr, who led an expedition to the area in 1898. The Alaska Volcano Observatory (AVO) rates Mount Spurr as Level of Concern Color Code Yellow. The mountain is known aboriginally by the Dena'ina Athabascan name K'idazq'eni, literally 'that which is burning inside'.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
6050 BCE~5782 BCE · 1件 · 最大 VEI ?5246 BCE~4978 BCE · 1件 · 最大 VEI ?4174 BCE~3905 BCE · 1件 · 最大 VEI ?3369 BCE~3101 BCE · 1件 · 最大 VEI ?1456~1724 · 1件 · 最大 VEI ?1724~1992 · 2件 · 最大 VEI 46050 BCE4174 BCE2029 BCE153 BCE1724

詳細タイムライン

  1. 1992年VEI 4観測記録
    1992-06-27 ~ 1992-09-17
    South flank (Crater Peak)
  2. 1953年VEI 4観測記録
    1953-07-09 ~ 1953-07-16
    South flank (Crater Peak)
  3. 1650年 (±50年)VEI ?地質学的推定
    1650 ~ 進行中
    South flank (Crater Peak)
  4. 紀元前 3250年VEI ?地質学的推定
    BCE 3250 ~ 進行中
    Mt. Spurr central lava/cone complex
  5. 紀元前 4050年VEI ?地質学的推定
    BCE 4050 ~ 進行中
    South flank (Crater Peak)
  6. 紀元前 5110年 (±100年)VEI ?地質学的推定
    BCE 5110 ~ 進行中
    Mt. Spurr central dome/cone complex
  7. 紀元前 6050年VEI ?地質学的推定
    BCE 6050 ~ 進行中
    Mt. Spurr central dome/cone complex

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。