The Karangetang, in the period of November 18 to 25, 2015 still appears visually erupting with a glowing lava dome at night, 10-25 meters high. From the main crater a thin white smoke, thick, is from about 50-200 m. The incandescent lava no longer flows, but the lava accumulations at the top of the ravines Kahetang and Batuawang are not stable, so that in case of heavy rain, it is likely to produce a lahar. The main lava flows occurred in the Batuawang ravine, over a distance of 2000 to 2500 m from the summit .
It is necessary to monitor the accumulation of lava debris that are not stabilized, occasionally slip into the ravine Batuawang and possibly out of the ravine. During the rainy season, the people who live along the shores of the Batuawang must be conscious of the appearance of these flows. There are still many villages around the Kola-Kola very vulnerable in the event of heavy rains, which are likely to bring a flood of material eruption. A lahar occurred on November 20th, 2015 at 17:23 pm in the Batuawang River, this incident was not very different from that of June 18, 2015, when the flow of volcanic material cut the highway Ulu – Ondong , covered by lava over a length of about 50 meters in the village of Bebali.
Seismicity of Karangetang, during the period from 18 to 25 November 2015 showed a decrease of activity. Earthquakes dominant like the earthquake of avalanche, which are not recorded, but the tremors are often recorded with maximum amplitude ranges from 0.5 to 6 mm and shallow volcanic earthquakes (VB). Many surface earthquake began to increase, so that the effusive eruptive activity will still continue, because this type of earthquake indicates the supply of magma. The volcanic equivalent of energy data model is still relatively the same as the previous period, because the magma moves from the inside to the surface without any obstacles.
Currently, effusive eruption of Karangetang has potential lava flows and pyroclastic avalanches.
The results of the analysis of instrumental data and visual evaluation until November 25, 2015 at 18:00 did not show an increase / decrease in volcanic activity significantly, so the level activity of the Karangetang remains at LEVEL III (Siaga).
The activity level of Karangetang will be reduced / increased again if there is a decrease / increase in volcanic activity and will be adapted to the seriousness of the threat.
November 28, 2015.Karangetang, Indonesia :
Source : VSI
Photo : Euronews