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.
Raung in Eastern Java in the Ijen Plateau is one of Java's most active volcanoes, with frequent explosive eruptions every few years. Raung is a massive stratovolcano constructed SW of the rim of the Ijen caldera. Its 3332-m-high, unvegetated summit of Gunung Raung is truncated by a dramatic steep-walled, 2-km-wide caldera where all of the frequent historical eruptions took place.
With a small group we climbed Raung during 14-15 August 2015. We might have witnessed the end of the large 2015 summit eruption, which during June-early August produced large lava flows, lava fountains and significant ash plumes.
Activity has strongly decreased at the volcano. When we visited Raung during 14-15 August, we observed pulsating, often near-continous ash emissions that produced plumes of several hundred meters. They often consisted of dark jets of ash, presumably from phreatomagmatic activity inside the conduit. ...more
This activity originated from the lower, southwestern vent of the large, double-crater new cinder cone in the eastern part of the caldera. The larger vent to the NE was almost entirely inactive, except two small, very weakly active effusive vents on its inner walls. Occasionally, glowing lava blocks were pushed out from these. The recent lava flow was no longer active. Like a giant pancake, it has completely covered the caldera floor surrounding the large cinder cone. [less]
Landsat 8 satellite image of Raung on 27 July. A gray patch left of a forest fire is visible on the NE flank.
The eruption at the volcano remains very intense and might have increased during the past days. ...more
An ash plume of 200 km length has been drifting south today. According to Indonesian press reports, new fissures have been reported (probably on the western flank) and incandescent ejecta were seen to up to a height of 1500 m. Some of them might have landed on the NE flank, where they probably caused a forest fire observed during 20-25 July. [less]
Heat signal from Raung volcano during the past year (MIROVA)
The eruption continues. Ash emissions have decreased, while satellite-detected heat emission increased during the past days. This could suggest that activity is now more effusive (lava flows) than explosive (ash emissions) in style. ...more
This morning, an ash plume rose approx. 1 km above the volcano and drifted 100 km to the SW. Indonesia's Volcanological Survey VSI mentioned yesterday that seismic activity rapidly decreased. Whether this means a near ending of the eruption remains to be seen. [less]
The eruption, now over 4 weeks old, continues with no significant changes. Strong lava effusion inside the summit caldera is accompanied by near-constant ash emissions rising 1-2 km and drifting up to 100-200 km in mostly westerly directions. ...more
PS: If you are interested in visiting (climbing) the volcano around 11-15 August, please contact us. [less]
The eruption of the volcano continues with intense ash emissions and the effusion of lava from vents inside the caldera and shows no signs of weakening. ...more
Depending on the wind direction, the ash plume, approx. at 5 km altitude, drifted several hundred kilometers and has been causing repeated closures of nearby regional airports, most notably Surabaya and Bali. Hundreds of travelers were temporarily stranded as their flights were canceled.
The eruption inside the summit caldera continues with intense strombolian activity and the effusion of an intra-crater lava flow. ...more
Ash emissions have been intense enough to produce a plume that rose to 17,000 ft (5 km) altitude and drifted more than 150 km to the SE. Several regional airports including Denpasar (DPS) on Bali have been closed. A recent visit by our friend and volcano expedition organizer Aris Yanto / Exploredesa shows that a new cone has been built inside the crater. [less]
The effusive-explosive activity at the volcano continued and increased over the past week. Strombolian explosions accompany a lava flow emitted from a vent inside the large summit crater. ...more
Some of the explosions were strong enough to produce significant but low-level ash plumes drifting east. Some airlines canceled flights to Surabaya and Bali that would pass near or in the paths of the plumes. The alert level was raised to 3("Siaga") on a scale of 1-4 and some nearby villages have been evacuated. [less]
Heat signal from Raung volcano during the past year (MIROVA)
Eruptive activity continues in the volcano's summit crater. Heat emission remains intense, suggesting the presence of lava (flow?), likely in combination with more or less intense strombolian activity. ...more
An ash plume was seen on satellite data last Friday. (VAAC Darwin) [less]
A strong thermal signal visible on satellite data suggests that eruptive activity in the volcano's summit crater has again picked up during the past two days. ...more
During late 2014 and early 2015, the volcano had been in strombolian activity and effused a lava flow inside its vast summit caldera. This activity had gradually decreased during the past months, but might now have resumed. [less]
PVMBG reported that, during infrequent times of clear weather during February-21 May 2014, gray and gray-to-brown plumes were observed rising as high as 300 m above Raung's crater rim. Rumbling was frequently heard at the observation post. Crater incandescence was observed during February and on 12 April. ...more
Seismicity fluctuated and was dominated by tremor. The Alert Level remained at 2 (on a scale of 1-4); residents and tourists were reminded not to approach the craters within a 2-km radius. [less]
Strombolian activity in Raung's crater in late Feb 2015 (photo: Andi / VolcanoDiscovery Indonesia)
Strombolian activity continues from the vents inside the summit caldera of the volcano. Raung's alert level of the volcano was raised to 2 (on a scale of 1-4) a week ago. ...more
An increasing number of volcanic-tectonic earthquakes had been detected. These quakes are indicators of rock breaking at depth, which can be caused by pressurized fluids, such as magma, intruding into the system.
Number of recorded volcanic-tectonic earthquakes at Raung (VSI)
Strombolian activity from a new vent inside Raung's summit caldera (image: Sofya Klimova)
Sofya Klimova from a team exploring Indonesian volcanoes by canoe climbed Raung volcano on 6 Jan and sent us the following report / pictures: ...more
"Inside the crater explosions occur with the release of a small amount of ash and volcanic material, but a lot of gas. Periodicity was approximately 40 minutes. From the crater continuously extruded lava. At night shots can be seen that it retains heat."
The new lava flow inside Raung's summit caldera (image: Sofya Klimova)
Volcano Calendar 2017: We're proud to present our 2017 volcano calendar: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
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