Since early January, the seismicity of Gunung Egon is increasing, with several seismic swarms of VT earthquakes, volcanic earthquakes, tornillos, and January 12, there are three volcanic earthquakes, seismic swarm 1, and other earthquakes including a shallow one.
In general, Egon produces phreatic type eruptions, accompanied by emissions of rocks, lava and ash, pyroclastic flows and lahars, mainly to WNW, because of the cut of the crater.
Because of the fog, little change is visible, only some white smoke is seen rising to 25 m. above the latter.
The shift of the alert from level II to level III, on January 13 at 6h, comes with a prohibited area to the public 3 km radius around the crater. The people of four villages located in this area should be evacuated.
Drainage areas are areas of potential hazards to communities who practice activities, especially in the rainy season. Wearing masks and goggles are recommended.
Sources: VSI Badan Geologi
The Egon is located on a shrinking of the island of Flores / Indonesia - Lesser Sunda Islands. The clear top, hosted an occasional crater lake; other crater lakes occupy the slopes; a lava dome form the summit culminating at 1671 meters. Solfatara are present at the edges and walls of the crater and the south upper flank.
An eruption of phreatic type, dates back to January 28, 2004, followed by four episodes until February 2005. On 15 April 2008, a phreatic explosion produced an ash plume that rose to 5,700 meters before drifting of 5 ,7 km. It required evacuations.
In Sinabung, explosions have followed yesterday and today.
The impressive plumes were photographed by Maz Yons.