Volcanic spine

Japanese: 火山岩尖 - かざんがんせん（英語表記）volcanic spine

A rock tower-like formation formed by the solidified lava being pushed up onto the crater of a volcano and solidifying into a columnar shape. It is called a lava spire or volcanic tower, and was once called Veronite. This type of volcanic formation is common in monogenetic volcanoes that form in one active period (one cycle). After the 1902 eruption of Mount Pelee on Martinique in the West Indies, lava rose at a rate of about 10 meters per day, creating a rock spire about 276 meters high and 100 to 170 meters in diameter, but it was destroyed by a subsequent eruption, causing a pyroclastic flow. In Japan, Mount Showa-Shinzan was formed in 1945, and a rock spire of about 100 meters protruded from the original ground of about 1 km in diameter, which had risen about 300 meters.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

ほとんど固化している溶岩が火山の火口上に押し上げられ，柱状に固結した岩塔状の地形。溶岩岩尖，火山岩塔などといい，かつてはベロニーテとも呼ばれた。1度の活動期（一輪廻）で形成される単成火山に多く見られる火山地形。西インド諸島のマルティニーク島にあるプレー山では 1902年の噴火後，溶岩が 1日に約 10mの速さでせり上がり，高さ約 276m，直径 100～170mの岩尖を築いたが，その後の噴火で破壊され，火砕流が生じた。日本では 1945年に形成された昭和新山があり，約 300mも隆起した直径約 1kmの元の地盤の上から，さらに約 100mもの岩尖が突き出た。

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