Mount Tambora Sumbawa Indonesia Postcard

Mount Tambora (or Tamboro) is an active stratovolcano, also known as a composite volcano, on the island of Sumbawa, Indonesia. Sumbawa is flanked both to the north and south by oceanic crust, and Tambora was formed by the active subduction zone beneath it. This raised Mount Tambora as high as 4,300 m (14,100 ft),[4] making it formerly one of the tallest peaks in the Indonesian archipelago. After a large magma chamber inside the mountain filled over the course of several decades, volcanic activity reached a historic climax in the super-colossal eruption of April 1815. (quote: wikipedia) This detailed astronaut photograph depicts the summit caldera of the volcano. The huge caldera—6 kilometres (3.7 miles) in diameter and 1,100 metres (3,609 feet) deep—formed when Tambora’s estimated 4,000-metre- (13,123-foot) high peak was removed, and the magma chamber below emptied during the April 10 eruption. Today the crater floor is occupied by an ephemeral freshwater lake, recent sedimentary deposits, and minor lava flows and domes from the nineteenth and twentieth centuries. (quote: NASA) This image was taken by the NASA Expedition 20 crew.