Raung volcano (East Java, Indonesia): photos August 2015

With a small group we climbed Raung during 14-15 August 2015. The hike involves approx. 20 km trekking and almost 2000 m climbing along a mostly overgrown path as only few people visit this spectacular volcano, even though it is one of Indonesia's most active ones.
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.

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In the morning of 14 August, the volcano is very active, producing ash plumes every few minutes. We are at the start of the trail, still far from the volcano. (Photo: Tom Pfeiffer)

In the morning of 14 August, the volcano is very active, producing ash plumes every few minutes. We ... [info]
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After several hours, we are at the steeper lower slope of the Raung stratovolcano. Only occasionally, vegetation leaves glimpses of the summit rim. (Photo: Tom Pfeiffer)

After several hours, we are at the steeper lower slope of the Raung stratovolcano. Only occasionally... [info]
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A large canyon is cut into the northern slope, exposing a steep wall several hundred meters tall. (Photo: Tom Pfeiffer)

A large canyon is cut into the northern slope, exposing a steep wall several hundred meters tall. (P... [info]
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As we continue to climb, Raung continues to greet us with ash puffs. (Photo: Tom Pfeiffer) [info]
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The last 300 m of the volcano are barren rock and sandy ash. (Photo: Tom Pfeiffer) [info]
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On the final ascent towards the crater rim. (Photo: Tom Pfeiffer) [info]
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View of the immense, 2 km wide summit crater, a small caldera surrounded by steep walls 4-500 m deep. It reminds a lot of Nyiragongo. The recent eruption has covered the whole floor with fresh lava and built a large cinder cone in the SE part (view is from the north). (Photo: Tom Pfeiffer)

View of the immense, 2 km wide summit crater, a small caldera surrounded by steep walls 4-500 m deep... [info]
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Frequent ash eruptions produce a plume rising a few hundred meters and drifting SW. (Photo: Tom Pfeiffer)

Frequent ash eruptions produce a plume rising a few hundred meters and drifting SW. (Photo: Tom Pfei... [info]
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View of the eastern crater walls. (Photo: Tom Pfeiffer) [info]
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Ash eruption in the early afternoon. (Photo: Tom Pfeiffer) [info]
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Raung volcano, East Java, Indonesia: The new cinder cone has two main vents; the smaller to the SW was producing intermittent, and sometimes continuous ash jets. (Photo: Tom Pfeiffer)

Raung volcano, East Java, Indonesia: The new cinder cone has two main vents; the smaller to the SW w... [info]
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Dark jets of ash and blocks as well as white steam expelled suggest that interaction of magma and water inside the conduit drives these eruptions (so-called phreatomagmatic activity). (Photo: Tom Pfeiffer)

Dark jets of ash and blocks as well as white steam expelled suggest that interaction of magma and wa... [info]
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Close-up of an eruption from the SW vent. (Photo: Tom Pfeiffer) [info]
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View of the flat lava flow, no longer active, as it had touched the eastern caldera wall. (Photo: Tom Pfeiffer)

View of the flat lava flow, no longer active, as it had touched the eastern caldera wall. (Photo: To... [info]
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Rim of Raung volcano's large summit caldera (July 2015, East Java, Indonesia) (Photo: Tom Pfeiffer) [info]
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In the late afternoon, activity stops and did not resume (at least until 16 Aug when we had last distant views of the volcano). (Photo: Tom Pfeiffer)

In the late afternoon, activity stops and did not resume (at least until 16 Aug when we had last dis... [info]
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View towards the extinct neighbor volcano Gunung Suket (2950 m) to the NE of Raung. (Photo: Tom Pfeiffer)

View towards the extinct neighbor volcano Gunung Suket (2950 m) to the NE of Raung. (Photo: Tom Pfei... [info]
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Sunset light on the eastern caldera walls of Raung volcano (East Java, Indonesia) (Photo: Tom Pfeiffer)

Sunset light on the eastern caldera walls of Raung volcano (East Java, Indonesia) (Photo: Tom Pfeiff... [info]
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Two very weakly active effusive vents inside the main crater feed tiny lava flows - no other significant activity was observed. (Photo: Tom Pfeiffer)

Two very weakly active effusive vents inside the main crater feed tiny lava flows - no other signifi... [info]
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View from the basecamp at night, at 2750 m elevation near the end of the vegetation, illuminated by a campfire. A spectacular view to the NW over densely populated Java with the silhouette of Argopuro volcano (in the left). (Photo: Tom Pfeiffer)

View from the basecamp at night, at 2750 m elevation near the end of the vegetation, illuminated by ... [info]
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Raung volcano (East Java, Indonesia): photos August 2015

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