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Mount Karthala
Mount Karthala or Karthola is an active volcano and the highest point of the Comoros at above sea level. It is the southernmost and larger of the two shield volcanoes forming Grande Comore island, the largest island in the nation of Comoros. The Karthala volcano is very active, having erupted more than 20 times since the 19th century. Frequent eruptions have shaped the volcano’s 3 km by 4 km summit caldera, but the island has largely escaped broad destruction. Eruptions on April 17, 2005 and May 29, 2006 ended a period of quiet.
==April 2005 eruption==
The eruption, which carried a risk of lava flows and deadly volcanic gas, caused the evacuation of 30,000 residents.
The crater was clearly changed by the April 2005 eruption. A grey field of ash surrounds the crater and the caldera itself seems larger and deeper. The crater lake, which formed after Karthala's last eruption in 1991 and once dominated the caldera, is now gone completely. In its place were rough, dark grey rocks, possibly cooling lava or rubble from the collapsed crater.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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