An eruption in 1775 caused the deaths of approx 1300 people.
On December 4, 2011 Mount Gamalama erupted, ejecting material up to 2,000 meters into the air. Thousands of residents in nearby Ternate City fled due to ash and dust particles raining down on the town. Finally on December 27 some 4 people died and dozens injured from debris falls (lahar) after a month of activity.
More eruptions occurred in September 2012.
An eruption on December 18, 2014, deposited five centimeters of ash on the runway of Babullah Airport in Ternate, closing the airport.
A phreatic explosion occurred yesterday (16 July) at 10 am local time, producing an ash plume that rose 1500 m. Ternate's airport was temporarily closed following the eruption.
The eruption had been preceded by increasing seismic activity since late June. The alert level of the volcano remains at 2 (waspada) on a scale of 1-4, but VAAC Darwin raised the aviation color code to "orange". An exclusion zone of 1.5 km around the summit is in place.