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Agung volcano
Stratovolcano 3142 m (10,308 ft)
Bali, Indonesia, -8.34°S / 115.51°E
Current status: erupting (4 out of 5)
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Agung volcano eruptions:
1808, 1821(?), 1843, 1963-64 (large Plinian eruption on March 16, 1963), 2017
Typical eruption style:
Highly explosive.
Last earthquakes nearby
Latest satellite images
 

Agung volcano news & activity updates:

Agung volcano (Bali, Indonesia) activity update: new lava dome growing in summit crater

Tuesday Dec 05, 2017 09:31 AM | BY: T

Deceivingly calm Agung volcano yesterday morning (image:  Øystein L. Andersen‏ @OysteinLAnderse / twitter)
Deceivingly calm Agung volcano yesterday morning (image: Øystein L. Andersen‏ @OysteinLAnderse / twitter)
Seismic signal from Agung today, showing a strong tremor episode in progress (image: Magma Indonesia)
Seismic signal from Agung today, showing a strong tremor episode in progress (image: Magma Indonesia)
SO2 plume from Agung on 1 Dec 2017 (Copernicus Sentinel-5P satellite data / ESA)
SO2 plume from Agung on 1 Dec 2017 (Copernicus Sentinel-5P satellite data / ESA)
At the surface, the explosive activity of the volcano has been declining during the past week and the ash and steam emissions have decreased considerably. Only a weak steam and gas plume has been observed since yesterday from the crater.
However, this apparent calm does not mean at all that the eruption is over. Rather that its style is changing: it has entered a more effusive stage, with viscous lava accumulating in the summit crater as a new lava dome, which is what volcanologists have recently confirmed according to an article in CNN Indonesia referring to PVMBG, the Center for Volcanology and Mitigation of Geological Hazards,.
If their information is right, Agung's new lava dome has already grown to approx. 30 million cubic meters of volume, and it is estimated that this corresponds to about 50% of the available magma volume ready to erupt.
The pace of growth has been worryingly fast: within a few days, the total volume of the dome was claimed to have increased by 10 million cubic meters.
Based on such estimates, the eruption could fill the crater (about 900 m wide and 200 m deep and thus has a capacity of 60 million cu meters) within the next 5-10 days only. At that stage, the eruption will become extremely dangerous: when lava starts to spill over the crater, the viscous, blocky lava will likely generate hot avalanches (pyroclastic flows), that can travel for many kilometers at high speed and devastate everything in their path.
However, this scenario will only happen if the supply of magma is large enough and the eruption still continues, something difficult to know. On the other hand, it seems rather likely that the magma supply is far from being exhausted at the moment: tremor episodes related to magma flowing upwards inside the conduit continue to occur, and ground deformation measurements indicate continuing inflation of the edifice, both indications that more magma is going to be erupted.
PVMBG plans to monitor the crater visually by a drone, but has been facing technical difficulties.
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Links / Sources:
Previous news
Monday, Dec 04, 2017
PVMBG reported that at 1730 on 25 November, after the number of volcanic earthquakes significantly increased, ash plumes rose 1.5 km above Agung’s crater rim and drifted 12 km WSW. Ashfall was reported in areas SW including Besakih (7 km SW), hamlets in the upper part of Pempatan (7.5 km W), and Temukus, prompting remaining residents to evacuate to the S. ... [more]
Satellite image of Agung volcano on  2 Dec 2017
Saturday, Dec 02, 2017
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Saturday, Dec 02, 2017
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Friday, Dec 01, 2017
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Satellite image of Agung volcano on  1 Dec 2017
Friday, Dec 01, 2017
Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ... [more]
Hazard map of Agung volcano (Sep 2017)
Hazard map of Agung volcano (PVMBG)
Hazard map of Agung volcano (PVMBG)

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