雲仙お山の情報館Image
0:00
0:00

頂部形成破砕溶岩丘(Eng) Formation of Fractured Lava Dome on the Summit - December 26, 1992

雲仙お山の情報館

長崎県 雲仙市
views:186views

雲仙普賢岳の噴火やそれによる災害の歴史をご紹介しています。
⑤ 頂部に形成された破砕溶岩丘  1992年12月26日
頂部に、砕石の山みたいな破砕溶岩丘が成長した。破砕溶岩丘は、マグマの供給量が10万㎥/日以下になると、地下で冷却し固まった溶岩が無理やり押し上げられて形成される。第4ローブは、後続の溶岩に押されて2つに裂けるとともに上部から転落する溶岩塊で埋没が進んでいる。その後、第5~9ローブが出現したが、これらも崩壊が進み、左奥の斜面にわずかに第6ローブの残骸が見える。

At the summit, a fractured lava dome resembling a heap of rubble had developed. Fractured lava domes are formed when cooled and solidified lava is forcefully pushed upward from underground as magma supply decreases to 100,000 cubic meters per day or less. The fourth lobe, under pressure from subsequent lava flows, split into two, and blocks of lava tumbled down from the upper portion, advancing the process of burial.
Subsequently, the emergence of the fifth to ninth lobes occurred. However, these too experienced collapse, and remnants of the sixth lobe are faintly visible on the left slope in the distance.


Where to enjoy this guide
View on map app
VOICE:west


Navigator

The Unzen Oyama Information Center

Unzen City, Nagasaki Prefecture  Certification badge

The Unzen Oyama Information Center is a facility that provides a wide range of information about the attractions of Unzen, including natural information, historical introductions, and exhibits on hot springs. We have the latest information to help you enjoy and appreciate Unzen more deeply, so please stop by here when you arrive in Unzen. Let's obtain the necessary information about nature, history, mountain climbing, transportation, and embark on a fun fieldwork. Please be sure to experience and enjoy the deep nature and history of Unzen!

Other guides for this user

There is no other registered information.