Sakurajima volcanic crisis Aug 2015: news & updates

Обновленный: 17 окт 2021 01:45 GMT -
Volcano back to normal activity with regular vulcanian explosions
Update Fri 04 Sep 09:43
Eruption from Sakurajima volcano this morning
Eruption from Sakurajima volcano this morning
After 3 weeks with almost no or no significant explosions, the volcano seems to be back in its typical state of activity that has been going on for years (but been quite elevated during the past years in comparison): intermittent small to moderately sized vulcanian-type explosions from the Showa crater have resumed since 1 Sep, producing ash plumes that rose to heights of 5-9,000 ft (1.5 - 2.7 km) altitude.
PS: This is good news for our planned Volcano Special tour to Sakurajima from 26-30 Sep (spaces still available)...
Alert level lowered, no more deformation detected during 2 weeks
Update Thu 03 Sep 07:50
The alert level was downgraded back to 3 (out of 5) last Tuesday as signs of unrest and the risk of a sudden major explosion have decreased.
No rapid crustal movements have been detected since 17 August, suggesting that the inferred magma intrusion has stopped and is now stagnating & cooling instead of migrating further towards the surface.
The volcano continues to be unusually calm with only minor explosions and ash emissions occurring occasionally from the Showa crater.
Risk of major eruption might be decreasing
Update Mon 24 Aug 09:27
The likelihood of a feared larger eruption seems to be decreasing as the volcano has slowly been resuming small explosive activity and shots of the crater show the presence of fresh lava.
This could mean that the conduit is not as strongly blocked as feared and could allow the volcano to return to a more regular eruption style, where pressure is released more gradually.

According to the Meteorological Agency , 4 small eruptions were observed at Sakurajima early Sunday, shortly after midnight Saturday, around 2:30 a.m., past 3 a.m. and past 6 a.m., producing ash plumes that rose 300-600 m.
On Saturday, the Kagoshima Municipal Government lifted an evacuation advisory for areas around Sakurajima following a state-backed panel's assessment Friday that the risk of an eruption seemed to be diminishing.
However, the volcanic alert level remains at 4 out of 5 as the crisis is not regarded over yet. Residents are asked to remain ready to evacuate quickly if need be.
Vent of Showa crater blocked - internal pressure rising
Update Fri 21 Aug 12:32
The blocked Showa crater of Sakurajima (image: Asahi Shimbun)
The blocked Showa crater of Sakurajima (image: Asahi Shimbun)
According to Japanese scientists, the scenario of a major eruption at the volcano is becoming more and more likely. The Asahi Shimbun news agency sent a drone to photograph the crater, confirming that a flat dome is currently blocking the conduit.
This blockage explains the near absence of explosions since mid July and suggests that internal pressure is increasing. The question is, simply put, when will it blow up and how much will come out?
Source: Blocked vent on Kagoshima volcano increasing likelihood of massive eruption (Asahi Shimbun)
Flat lava dome in summit crater
Update Fri 21 Aug 10:04
Sakurajima's lava dome inside Showa crater
Sakurajima's lava dome inside Showa crater
A pancake-shaped flat dome of lava has been detected inside the Showa summit crater. This type of dome is typical for moderately viscous and gas-poor lava (typically andesitic composition) extruded at subduction-zone stratovolcanoes.
The alert level of the volcano remains at 4 out of 5. One possibility is that the dome corresponds to older lava from the upper conduit that has been pushed out by a rising batch of fresher lava still inside the volcano.
Volcanic gas releases from sea floor detected
Update Wed 19 Aug 16:45
More worrying signs of volcanic unrest started to appear: according to FNN News, volcanic gas releases have been detected at the sea floor of the Futatsumata Port on the northern shore of Sakurajima peninsula (located approx 4 km from summit).

Sakurajima volcano (Japan): satellite radar measurments detect 16 cm inflation

Wed, 19 Aug 2015, 12:40
Inferometry map of Sakurajima showing large deformation (inflation) of the summit area
Inferometry map of Sakurajima showing large deformation (inflation) of the summit area
Самые последние радиолокационных измерений спутника ALOS-2 Японии агентством аэрокосмических исследований (ДЖАКСА) показывают, что саммит вулкана завышены, огромное количество около 16 см в течение интервала 4 Янв - 17 августа этого года.
Это свидетельствует о том, что значительные партии новых магмы в настоящее время хранится в вулкан верхней водопроводно-канализационной системы и остается вопрос, когда и как он может взорваться. В то время как поверхностная активность на вулкан остается очень спокойной, власти продолжают готовиться к возможные сценарии крупного извержения в ближайшем будущем.
  • The results of the emergency observation of Sakurajima by "ALOS-2" (JAXA)

Sakurajima volcano (Kyushu, Japan) activity update

Tue, 18 Aug 2015, 13:26
Деятельность фактически снизилась и был относительно низким, на вулкан в последние дни. Однако риск крупного извержения остается согласно Японское метеорологическое агентство, которые поддерживает уровень оповещения 4 (подготовка к эвакуации).

Sakurajima volcano (Japan): alert level raised as volcanologist fear major eruption

Sun, 16 Aug 2015, 10:42
Seismic signal of Sakurajima's SKRB station on 15 Aug (V-NET)
Seismic signal of Sakurajima's SKRB station on 15 Aug (V-NET)
Японские вулканолог мониторинг вулкана предупредил, что большие извержения может произойти в ближайшем будущем. Уровень вулкан оповещения был поднят на второй высокий, 4 из 5, что означает, что подготовка к эвакуации близлежащих районов (в нескольких км от кратера Сёва) в процессе.
Предупреждение было основано на сильный Рой мелких вулканических землетрясений, расположенный под кратера сева. Сейсмической роиться начал около 7 утра на 15 августа (по местному времени) и своего пика с почти 180 землетрясений в час около полудня. Он постепенно угас, но продолжает с более слабой интенсивностью до сих пор.
В то же время было обнаружено значительной инфляции Сева кратера. Эти оба скорее всего вызвана ростом новой партии магмы, которое может привести к больше то обычно извержения.
Хотя невозможно предсказать, произойдет ли или нет такого извержения, власти предупреждают не подойти кратера на расстоянии 3 км - очень умеренные ограничения-, который легко в диапазоне баллистических снарядов и пирокластических потоков, которые вероятно произойти во время более крупные извержения.
  • 桜島 火山性地震が急増 警戒レベル4に (NHK news)
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