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Sakurajima, Japon: éruptions vulcaniennes en juillet 2013 (photos)

During the 2013 IAVCEI conference held in Kagoshima, Kyushu, Japan, from 19-24 July, Tom had the opportunity to visit the volcano (mainly in the evenings) and take pictures of the elevated activity the volcano was in during this time.
Vulcanian-type explosions, sometimes powerful with ash plumes rising up to 20,000 ft (6 km) altitude occurred at exceptionally high rates of 5-10 per day, and during intervals, the volcano had often displayed (silent as well as loud) near-constant ash venting in combination sometimes with deep-seated strombolian activity.
A powerful explosion produces a large mushroom plume of ash with two fans drifting to the E and N. (20 July 14:48 UTC / 10,000 ft). (Photo: Tom Pfeiffer)
A powerful explosion produces a large mushroom plume of ash with two fans drifting to the E and N. (... [info]
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Evening with Sakurajima in a period of calm. (Photo: Tom Pfeiffer)
Evening with Sakurajima in a period of calm. (Photo: Tom Pfeiffer) [info]
(912 Hits)
Suddenly, the volcano explodes with a very loud detonation and ejects a mass of lava, rocks and a quickly rising ash plume (21 July 11:02 UTC). (Photo: Tom Pfeiffer)
Suddenly, the volcano explodes with a very loud detonation and ejects a mass of lava, rocks and a qu... [info]
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The plume from the explosion rises vertically to 12,000 ft. (Photo: Tom Pfeiffer)
The plume from the explosion rises vertically to 12,000 ft. (Photo: Tom Pfeiffer) [info]
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Constant ash venting and smaller explosions followed during the rest of the night. After the explosion at 11:02 UTC, the volcano had no other vulcanian explosions for about 20 hours. (Photo: Tom Pfeiffer)
Constant ash venting and smaller explosions followed during the rest of the night. After the explosi... [info]
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Zoom onto the Showa crater from the southeast. (Photo: Tom Pfeiffer)
Zoom onto the Showa crater from the southeast. (Photo: Tom Pfeiffer) [info]
(1188 Hits)
Sakurajima seen from the Shiroyama park. (Photo: Tom Pfeiffer)
Sakurajima seen from the Shiroyama park. (Photo: Tom Pfeiffer) [info]
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A series of 4-5 increasingly powerful explosions occurred within about half an hour on the afternoon of 22 July (07:00-07:35 UTC). Members of the M2 mid-conference field trip were lucky to be at the southern observation point at that time!). (Photo: Tom Pfeiffer)
A series of 4-5 increasingly powerful explosions occurred within about half an hour on the afternoon... [info]
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Shortly after sunset on 22 July (11:19 UTC), a large explosion occurs that produces an ash plume rising to 14,000 ft. Weak lightning is visible in the eruption. Trail of an airplane in the sky. (Photo: Tom Pfeiffer)
Shortly after sunset on 22 July (11:19 UTC), a large explosion occurs that produces an ash plume ris... [info]
(1232 Hits)
Sakurajima, Japan, July 2013: The largest explosion observed from close occurred at 23h33 (14:33 UTC) - although the eruption was not mentioned in Tokyo's VVAC, the ash plume was the at least as large as the larger ones previously observed. The eruption lasted more than 2 minutes, starting with an initial explosion and continuous lava and ash fountains afterwards. The plume darkened the sky of the whole eastern area for the rest of the night. (Photo: Tom Pfeiffer)
Sakurajima, Japan, July 2013: The largest explosion observed from close occurred at 23h33 (14:33 UTC... [info]
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Lava fountaining (or continuous strombolian-type eruptions) during the eruption with lightning caused by electrostatic charges in the rising ash plume. (Photo: Tom Pfeiffer)
Lava fountaining (or continuous strombolian-type eruptions) during the eruption with lightning cause... [info]
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The slopes of Showa crater littered with incandescent bombs during the fountaining phase of the ongoing eruption (14:33 UTC, 22 July). (Photo: Tom Pfeiffer)
The slopes of Showa crater littered with incandescent bombs during the fountaining phase of the ongo... [info]
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An explosion on 24 July evening (12:11 UTC) - only eruption lightning was visible in the ash-filled air hovering around the crater. (Photo: Tom Pfeiffer)
An explosion on 24 July evening (12:11 UTC) - only eruption lightning was visible in the ash-filled ... [info]
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On 14 July, the Showa crater was mainly producing near-constant ash emissions, which were very noisy - roaring jet-engine-like sounds swelling and decreasing. On the other observation days, no sounds could be heard, though. (Photo: Tom Pfeiffer)
On 14 July, the Showa crater was mainly producing near-constant ash emissions, which were very noisy... [info]
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Ash emissions reaching about 500 m height above the Showa crater (14 July). (Photo: Tom Pfeiffer)
Ash emissions reaching about 500 m height above the Showa crater (14 July). (Photo: Tom Pfeiffer) [info]
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After sunset, small lightnings could sometimes be seen in the ash column (14 July). (Photo: Tom Pfeiffer)
After sunset, small lightnings could sometimes be seen in the ash column (14 July). (Photo: Tom Pfei... [info]
(852 Hits)

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