A sudden magma eruption can be expected any time, as well as heavy ash-fall and the eruption of stones within an area of 2.5 kilometers from the Bromo's crater. Mt. Bromo its activity level is increased from Level II (Alert) to Level III, as of December 4th, 2015 at 14:00 pm.
Seismic activity
The status of "Level III" means "Possible to erupt". Based on observational and seismic data analysis Mt. Bromo its status is increased. A sharp increase in "Real-time Seismic Amplitude" was measured at the beginning of December 2015 compared to the constant increase in November 2015. Earthquake tremor is recorded continuously with a maximum amplitude of 8 mm. Seismic activity is dominated by constant tremors, which are like to increase sharply. A concentrated sulfuric odor can still be smelled.
Between 30 October and 8 November 2015 a rumble of Mt. Bromo is followed by an eruption of thick smoke that reached a height between 100 and 150 meters. Then, fine volcanic ashes were sent into the air several times till the end of November.
Recommendations for visitors
It is recommended that visitors and also locals don't get closer than 2.5 kilometers to Mt. Bromo. If you wish to see Mt. Bromo and its panorama, that is still possible in Cemara Lawang village or from the viewpoint Mt. Pananjakan. Locals are asked to stay calm, to be suspicious of not confirmed stories, and to be careful because of the constantly increasing eruptions. In case an eruption of ashes occurs, it is best to wear a mask to cover ones mouth and to wear eye protection.
Previous eruption Mt. Bromo, 2010
In November 2010 Mt. Bromo's activity increased, only to erupt at November 23 at 20.00. Just a few hours before the eruption, at 15.30, the status of Mt. Bromo was increased to level IV, which means "Caution". On December 8th its status was decreased to level II ("Alert").