The tsunami was triggered by a magnitude 7.7 earthquake that hit at 9:42 p.m., local time, on Monday near the western island of Sumatra. The resulting waves killed more than 300 people. A few hours later the 9,700-foot (3,000-meter) volcano Mount Merapi, on the eastern island of Java, blew a pillar of hot ash and debris into the sky, killing at least 30 people living on its slopes. Mount Merapi, Indonesia's most active volcano, had been building up steam for several days. (source: news.nationalgeographic.com)
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