Merbabu is a stratovolcano in central Java with two explosive eruptions in 1560 and 1797. An explosive eruption was reported in 1570 but not confirmed. Explosions from the 1797 eruption were moderate in size (Volcanic Explosivity Index = 2).
Source of Information:
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.