Caldera - Wikipedia
ウェブCaldera. A caldera ( / kɔːlˈdɛrə, kæl -/ [1] kawl-DERR-ə, kal-) is a large cauldron -like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the structural integrity of such a chamber, greatly ...
カルデラ - Wikipedia
ウェブカルデラ （ 西: caldera [注釈 1] [注釈 2] [注釈 3] ）とは、 火山 の活動によってできた大きな凹地のことである。. 「 釜 [注釈 4] 」「 鍋 [注釈 5] 」という意味の スペイン語 に由来し、カルデラが初めて研究された カナリア諸島 での現地名による [1] 。. 本来 ...
Calderas - National Geographic Society
ウェブ2023年10月19日 · A caldera is a large depression formed when a volcano erupts and collapses. During a volcanic eruption, magma present in the magma chamber underneath the volcano is expelled, often forcefully. When the magma chamber empties, the support that the magma had provided inside the chamber disappears.
Types of Calderas - National Geographic Society
ウェブ2024年4月30日 · A caldera is a depression created after a volcano releases the majority of the contents of its magma chamber in an explosive eruption. Without any structural support below, the land around the erupting volcanic vent or vents collapses inwardly, creating the bowl-shaped caldera.
Caldera: Crater Formed by Volcanic Collapse or Explosion ...
ウェブCrater Lake formed about 7700 years ago when a massive volcanic eruption of Mount Mazama emptied a large magma chamber below the mountain. The fractured rock above the magma chamber collapsed to produce a massive crater over six miles across. Centuries of rain and snow filled the caldera, creating Crater Lake.
Volcano - Calderas, Magma, Eruptions | Britannica
ウェブ3 日前 · Volcano - Calderas, Magma, Eruptions: Most calderas—large circular or oval depressions more than 1 km (0.6 mile) in diameter—have been formed by inward collapse of landforms after large amounts of magma have been expelled from underground. Many are surrounded by steep cliffs, and some are filled with lakes.
Caldera | Volcanic, Formation, Crater | Britannica
ウェブ2024年4月25日 · caldera, large bowl-shaped volcanic depression more than one kilometre in diameter and rimmed by infacing scarps. Calderas usually, if not always, form by the collapse of the top of a volcanic cone or group of cones because of removal of the support formerly furnished by an underlying body of magma (molten rock).
Caldera or crater…what’s the difference? | U.S. Geological Survey
ウェブ2024年1月8日 · By strict definitions, a caldera is a type of crater, but calderas are distinguished by their large sizes and specific association with volcanic collapse. Yellowstone is a caldera. The eruption that occurred 631,000 years ago largely emptied the magma chamber, and the ground collapsed into the resulting void.
カルデラ噴火
ウェブ2024年2月9日 · カルデラとは、急な崖で囲まれている円形・多角形の凹地をさす地形用語です。. 火山が大規模な噴火を起こすとき、その山頂付近や、ときにはより広い範囲にわたってカルデラをつくることがあります。. 日本にはこのような火山性のカルデラは多 …
カルデラとは？ 意味や使い方 - コトバンク
ウェブカルデラ. 〘名〙 (caldera) 火山中央部にある直径数キロメートル以上の鍋状のくぼ地。. 爆発による円錐火山頭部の飛散、あるいは大量の マグマ が噴出したあとに起こる陥没によって生じる。. 外周はほぼ円形で、内部に新しい火山を生じて複式火山となる ...
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