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Near-crater volcanic warning in Japan: “Warnings around the crater Kirishimayama, 10:00 JST, 24 October 2014
Source: Japan Meteorological Agency website, http://www.jma.go.jp/en/volcano/

Volcanos near Sendai NGS
Map Showing Volcanos Near Sendai Nuclear Reactors
Exported from: http://en.wikipedia.org/wiki/List_of_volcanoes_in_Japan

There is a volcanic warning in the area of the Kirishima mountain range, roughly 64 km (40 miles) from the Sendai nuclear generating station. Sendai nuclear generating station is also 50 kms (31 miles) from Mount Sakurajima, which erupts frequently. The closest caldera formed by previous eruptions is only 40 kms (25 miles) away. (See Reuters below).

Japan warns of increased activity at volcano near nuclear plant Posted:Fri, 24 Oct 2014 04:58:49 GMT
TOKYO (Reuters) – Japan warned on Friday that a volcano in southern Japan located roughly 64 km (40 miles) from a nuclear plant was showing signs of increased activity that could possibly lead to a small-scale eruption and warned people to stay away from the summit.

The Sakurajima Volcano, even closer to the Sendai Nuclear Reactors, like the more famous Pompeii Italy, has been classified as a “Decade Volcano”:
The Decade Volcanoes are 16 volcanoes identified by the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI) as being worthy of particular study in light of their history of large, destructive eruptions and proximity to populated areas. The Decade Volcanoes project encourages studies and public-awareness activities at these volcanoes, with the aim of achieving a better understanding of the volcanoes and the dangers they present, and thus being able to reduce the severity of natural disasters.http://en.wikipedia.org/wiki/Decade_Volcanoes (Emphasis added.)

Professor Emeritus-Volcanologist Toshitsugu Fujii recently pointed out the difficulty of predicting volcanos and that pyroclastic flows could impact as far away as 100 kilometers. The Sendai nuclear reactors are, however, much closer to volcanos. With volcanic outbreaks and ash fall the plant could be cut off from the outside world, he warned. See: “Japanisches Atomkraftwerk als tickende Zeitbombe: Zu nah an Vulkan“, 19.10.2014, 06:02 http://www.krone. at/Welt/Japanisches_Atomkraftwerk_als_tickende_Zeitbombe-Zu_nah_an_Vulkan-Story-423753

A pyroclastic flow (also known scientifically as a pyroclastic density current) is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph). The gas can reach temperatures of about 1,000 °C (1,830 °F). Pyroclastic flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the volcanic output rate, and the gradient of the slope. They are a common and devastating result of certain explosive volcanic eruptions.http://en.wikipedia.org/wiki/Pyroclastic_flow

Returning to Kirishima, which now has a warning, here is some information about its 2011 explosive eruption:

Kirishimayama(Shinmoedake)[Alert Level : 2→3]

On 19th January, a minor eruption occurred at Shinmoedake in the Kirishimayama volcanoes group, which was thought to be a phreatomagmatic eruption. On 26th January at 07:31 a minor eruption occurred; at 14:49 it moved into the essential magma eruptions. At 18:00, the alert level was raised from 2 to 3, transitioning the volcano into a period of possible high activity (Target area had changed from the area around the crater to the non-residential areas near the crater). Lava fragment emissions from the summit crater were confirmed by the visual camera at night on the same day. Night-time glow was also visible by a high-sensitivity camera since 26th

January. A middle scale of the explosive eruption occurred on 27th January at 15:41, and plumes rose as high as 2,500 m above the crater rim and went up into the clouds (photo 2). The last explosive eruption at Shinmoedake was 1959.
Source: Japan Meteorological Agency website, Kirishima
Source: Japan Meteorological Agency website: http://www.data.jma.go.jp/svd/vois/data/tokyo/eng/volcano_activity/2011/2011_01_monthly.pdf

One side of Sakurajima
The other side of Sakurajima
Sakurajima other side
Pompeii Italy
old image of Pompeii public domain

Additional Sites of Interest at the Japan Meteorological Agency website:
Volcano Alerts: http://www.jma.go.jp/en/volcano/
Historic Mthly Summaries: http://www.data.jma.go.jp/svd/vois/data/tokyo/eng/volcano_activity/monthly.htm
Official Volcano Map: http://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/souran_eng/menu.htm