Mount Tambora’s eruption began on April 5, 1815, with small tremors and pyroclastic flows. On the evening of April 10, a powerful blast blew apart much of the mountain. The blast, pyroclastic flows, and tsunamis killed at least 10,000 islanders and destroyed the homes of 35,000 more. Before the eruption, Mount Tambora was about 4,300 meters (14,000 feet) high. Afterward, it had lost much of its top and a caldera about 6 km (3.7 miles) across remained.
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