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Volcano back to normal activity with regular vulcanian explosions
Update Fri 04 Sep 09:43
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.
— Britannia PR (@Britanniacomms) August 22, 2015
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)
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
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
mié, 19 ago 2015, 12:40
12:40 PM | POR: T
Inferometry map of Sakurajima showing large deformation (inflation) of the summit área
Las mediciones más recientes de radar por satélite ALOS-2 de la Agencia de exploración aeroespacial de Japón (JAXA) muestran que la Cumbre del volcán ha inflado por la enorme cantidad de aprox. 16 cm en el intervalo ene - 17 4 de agosto este año.
Esto sugiere que un lote importante de magma nuevo se almacena actualmente en sistema de plomería superior del volcán y la cuestión es Cuándo y cómo podría entrar en erupción. Mientras que la actividad superficial del volcán se ha mantenido muy tranquilo, las autoridades siguen para prepararse para el posible escenario de una gran erupción en el futuro cercano.
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The results of the emergency observation of Sakurajima by "ALOS-2" (JAXA)
Sakurajima volcano (Kyushu, Japan) activity update
mar, 18 ago 2015, 13:26
13:26 PM | POR: T
Actividad realmente ha disminuido y sido relativamente baja en el volcán durante los últimos días. Sin embargo, sigue existiendo el riesgo de una erupción importante según la Agencia Meteorológica de Japón que mantiene nivel de alerta 4 (preparación para la evacuación).
Todas las noticias: Sakurajima volcano
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Sakurajima volcano (Japan): alert level raised as volcanologist fear major eruption
dom, 16 ago 2015, 10:42
10:42 AM | POR: T
Seismic signal of Sakurajima's SKRB station on 15 Aug (V-NET)
Vulcanólogo japonés monitoreo volcán advirtió que una erupción más grande podría ocurrir en un futuro próximo. El nivel de alerta del volcán fue elevado a la segunda más alta, 4 fuera de 5, lo que significa que están preparados para evacuaciones de zonas cercanas (dentro de pocos kilómetros desde el cráter Showa) en curso.
La alerta se basó en un fuerte enjambre de terremotos volcánicos poco profundos ubicado bajo el cráter Showa. El enjambre sísmico comenzó alrededor 7:00 en 15 de agosto (hora local) y alcanzó su punto máximo con casi 180 sismos por hora alrededor del mediodía. Poco a poco disminuido, pero continúa con intensidad más débil hasta ahora.
Al mismo tiempo, se ha detectado una inflación significativa del cráter Showa. Estos son probablemente causados por el levantamiento de un nuevo lote de magma, que podría provocar una erupción más grande entonces habitual.
Aunque es imposible predecir si o no tal una erupción ocurrirá, las autoridades advierten de no acercarse al cráter de 3 km de distancia - un límite muy moderado-, que se encuentra fácilmente en la gama de proyectiles balísticos y flujos piroclásticos que probablemente se producen durante una erupción mayor.
Todas las noticias: Sakurajima volcano
Información sobre: Sakurajima volcano
桜島 火山性地震が急増 警戒レベル4に (NHK news)
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Sakurajima volcano in eruption (July 2013)
Eruption warning note for visitors
Due to a possible larger eruption at Sakurajima, residents in the south of the peninsula (around Furusato Onsen and the Arimura observation deck) are now requested to be prepared for a possible evacuation. Tourists on the peninsula should exercise caution.
- Sakurajima Visitor Center
estratovolcán 1117 m / 3,665 ft
Kyushu, Japan, 31.59°N / 130.66°E
Current status: erupción (4 out of 5)
Sakurajima webcams / datos en tiempo real | Noticias/Updates | Earthquakes | Volcano videos | Books | Tours
Erupciones del volcán Sakurajima:
1955-ongoing, 1954(?), 1950, 1948, 1946, 1942, 1941, 1940, 1939, 1938, 1935, 1914-15, 1899(?), 1860, 1799, 1797, 1794, 1792, 1791, 1790, 1785, 1783, 1782, 1779-81, 1756, 1749, 1742, 1706, 1678, 1670(?), 1642, 1478, 1471-76, 1468, 778, 766, 764, 716-18, 712(?), 708
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Redating the Minoan eruption of Santorini
A 3600 y.o. fossil olive tree discovered in the Minoan pumice allows to refine the date of the Minoan eruption on Santorini to the 17th century B.C.
Volcanic crisis at Sakurajima - updates
A strong earthquake swarm and increased inflation were detected in August 2015 and triggered authorities to raise the alert level, as volcanologists think that a larger eruption could follow. News and updates on the events can be found on this page.
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Convergent plate boundaries and subduction zones
As an oceanic plates collides with another plate, it is subducted and generates volcanism on the overlying plate.
Germany has a large number of volcanoes - most of them extinct, but the Eifel volcanic field is still potentially active.
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