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Qualibou, also known as the Soufrière Volcanic Centre is a 3.5 X 5 km wide caldera on the island of Saint Lucia that formed approximately 32-39,000 years ago. This eruption also formed the Choiseul Tuff which covers the south east portion of the island. The Pitons are two large lava domes that formed 200-300,000 years ago, some time before the formation of the caldera and since then other domes have filled the caldera floor. More recently, there was a phreatic eruption in 1766 that deposited ash over a wide area. Sulphur Springs is an active geothermal area located roughly in the centre of the caldera. In 1990, 1999 and 2000 there were shallow depth volcanic earthquakes located 6 km ESE of the caldera.〔(【引用サイトリンク】title=St Lucia )〕 == Gallery == Image:Sulphur_Springs_2003.jpg|Sulphur Springs Image:Petit Piton.JPG|Petit Piton Image:Day248bdriveq.JPG|Soufrière and the Pitons 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Qualibou」の詳細全文を読む スポンサード リンク
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