The PVMBG raised the alert level of the Agung volcano to 3 / Siaga (watch) on September 18, 2017 at 9 pm WIB, following visual observation, white fumaroles ascend from the bottom of the crater up to 50 meters the lip of the crater, and a significant increase in seismicity.
Since 10 August, the Observatory has noticed an increase in the number of volcanic earthquakes (VA) associated with rock fracturing, with an amplitude of 3-10 mm. The increase in VB earthquakes, with an amplitude of 2-10 mm, is constant.
Local tectonic earthquakes, in relation to stress in the area surrounding the Agung, have been steadily increasing since 26 August, with an amplitude ranging from 6 to 22 mm. Their frequency increased between 14 and 18 September.
A map of the areas at risk was updated by the BNPB indicating a threat in the northern part of the volcano, particularly in the Tukad Tulamben basin, Tukad Daya, Tukad Celagi in the crater opening area. In the southeastern area, the Tukad Bumbung River is targeted, and in the southern zone, Pati, Tukad Panglan and Tukad Kabah are concerned.
It is recommended not to move or camp within a radius of 6 km around the top crater, with an area extended to 7.5 km. towards the north, south-east and south-south-west.
The recommendations of the PVMBG, via the Magma Indonesia site, make it possible to monitor the development of a possible activity and / or evacuation.
Map of the Agung hazard zones: in red, zones of possible pyroclastic flows; in green, risk zones of lahars - Doc. BNPB
The heat and cold were blown yesterday, with the announcement of thermal signals on the north slope, actually associated with fires of human origin. The crisis management service, the BNPB, reported on Twitter on September 19th that there had been no explosions or rain ... and that the (current) conditions are safe.
Sources: PVMBG, BNPB, and social networks