Also they are hit by monsoons seasonly. Because of the islands positioning on the tectonic plates earthquakes are very frequent. Indonesia also has tropical storms/ cyclones occasionally during the wet season.
Volcano
Merapi Central Java 03 November 2010 138 deaths
Tambora Sumbawa 10 April 1815 71,000+ Deaths
Krakatau Sunda Strait 26 August 1883 36,600 deaths
Earthquake
Sumatra 25 October 2010 7.7 magnitude 435 deaths
Sumatra 26 December 2004 9.2 magnitude 283,106 deaths
Java 26 May 2006 6.3 magnitude 5,780 deaths
Volcano
Merapi Central Java 03 November 2010 138 deaths
Tambora Sumbawa 10 April 1815 71,000+ Deaths
Krakatau Sunda Strait 26 August 1883 36,600 deaths
Earthquake
Sumatra 25 October 2010 7.7 magnitude 435 deaths
Sumatra 26 December 2004 9.2 magnitude 283,106 deaths
Java 26 May 2006 6.3 magnitude 5,780 deaths