Volcano Calendar 2018: We're proud to present our 2018 volcano calendar: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Mount Agung or Gunung Agung is a active volcano in Bali. This stratovolcano is the highest point on the island. It dominates the surrounding area influencing the climate. The clouds come from the west and Agung takes their water so that the west is lush and green and the east dry and barren.
Deceivingly calm Agung volcano yesterday morning (image: Øystein L. Andersen @OysteinLAnderse / twitter)
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. ...more
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.
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)
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
Eight inbound and 13 outbound international flights were cancelled, affecting 2,087 passengers. Crater incandescence was observed at 2100, signifying the presence of lava in the crater. BNPB noted that the number of evacuees was 25,016 (spread out in 224 shelters). [less]
Night-time view of the eruption at Agung volcano (Magma Indonesia)
The eruption has been gradually intensifying since yesterday: near continuous explosions generate an eruption column that is now rising to approx. 30,000 ft (9 km) altitude with the ash plume spreading east and south and forced the closure of Bali's and Lombok's airports today. ...more
More evacuations have been ordered in the areas around the volcano, and light to moderate ash fall is occurring in downwind areas where people are advised to wear protecting masks. PVMBG has raised the alert level of Agung to "awas" (4 on a scale of 1-4), and the exclusion zone is now 8-10 km wide.
Night-time view of the eruption at Agung volcano (Telkomsel Balinusra webcam live view)
Seismogram of Agung volcano today with strong tremor episodes (image: Magma Indonesia / VSI)
Ash plume from Agung volcano yesterday morning (image: PVMBG)
After several weeks of apparent calm, the awaited eruption of the volcano has begun early on Saturday morning (25 Nov 2017): Moderate explosive ash emissions have been creating a plume that has been rising 1.5-4 km above the summit crater of the volcano and drifting mainly to the south. ...more
So far, the eruption is only moderate in scale and has not caused significant damage, and Indonesia's civil protection urges the population to remain calm and not panic. While Denpsar's airport remains operational, several (mainly Australian) airlines have already cancelled flights in and out of Denpasar. According to observers and some webcam images, incandescence can be seen at the crater at night, and according to the volcanologists from PVMBG, the erupted ash is dark to black, likely from fresh magma. These observation suggest that by now the new magma ha indeed arrived at the surface. [less]
Earthquakes near Volcanoes: Our world-wide map continuously detects shallow earthquakes near volcanoes. These could be early signs of unrest and often precede eruptions.
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