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]
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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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Weak westerly winds drift the plume over the eastern sector, where the otherwise full-moon lit sky darkens completely for about two-three hours. About one hour (!) after the explosion is over, large lightning occurs in the ash plume. Smaller lightning still occurred up to two hours after the explosion. Ash rain forced me to retreat. (Photo: Tom Pfeiffer)
Weak westerly winds drift the plume over the eastern sector, where the otherwise full-moon lit sky d... [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]
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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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The last explosion produced an ash eruption column rising to 14,000 ft (22 July 07:35 UTC). (Photo: Tom Pfeiffer)
The last explosion produced an ash eruption column rising to 14,000 ft (22 July 07:35 UTC). (Photo: ... [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]
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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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Ash emission from Showa crater on the evening of 24 July. (Photo: Tom Pfeiffer)
Ash emission from Showa crater on the evening of 24 July. (Photo: Tom Pfeiffer) [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]
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Moon-lit ash plume with lightning (14 July). (Photo: Tom Pfeiffer)
Moon-lit ash plume with lightning (14 July). (Photo: Tom Pfeiffer) [info]
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At 12:50 UTC (21:50 local time), a rather small vulcanian explosion could be seen (ash plume height: 6000 ft). (Photo: Tom Pfeiffer)
At 12:50 UTC (21:50 local time), a rather small vulcanian explosion could be seen (ash plume height:... [info]
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During the second half of the night 14-15 July, the Showa crater continued to produce noisy ash emissions and incandescence was often visible at the base of the plume, suggesting weak, deep-seated strombolian activity in the vent. (Photo: Tom Pfeiffer)
During the second half of the night 14-15 July, the Showa crater continued to produce noisy ash emis... [info]
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Occasionally, strombolian activity was strong enough to eject bombs above the rim of Showa crater (early 15 July). (Photo: Tom Pfeiffer)
Occasionally, strombolian activity was strong enough to eject bombs above the rim of Showa crater (e... [info]
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Small ash puff on the afternoon of 19 July, seen from Kagoshima Bay. (Photo: Tom Pfeiffer)
Small ash puff on the afternoon of 19 July, seen from Kagoshima Bay. (Photo: Tom Pfeiffer) [info]
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