1.
caldera floor; crater plain
The relatively flat plain inside a large volcanic crater or caldera, often containing smaller central cones, lakes, or vegetation.
火口原に湖がある。
There is a lake on the caldera floor.
阿蘇山の火口原は広大だ。
The caldera floor of Mount Aso is vast.
火口原の中央には、噴火によってできた中央火口丘がそびえている。
In the center of the caldera floor rises a central cone formed by an eruption.
Compound of 火口 (volcanic crater) + 原/原 (plain). Used in geology and geography for the flat interior of a caldera or large crater. A 火口原 often contains a smaller 中央火口丘 (central cone) or 火口原湖 (crater lake).
COMMON COLLOCATIONS:
- 火口原湖: crater lake on a caldera floor
- 中央火口丘: central cone within a caldera
- 広大な火口原: vast caldera floor
RELATED TERMS:
- 火口: volcanic crater
- カルデラ: caldera (loanword)
- 火山: volcano
- 噴火: volcanic eruption