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National volcano overview (August) | NHK News

2019-09-09T15:41:16.579Z

On March 9, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide in August and points to watch out for. An eruption occurred or volcanic activity increased ...



National volcano overview (August) 00:00 on September 10

On March 9, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide in August and points to watch out for. As eruptions have occurred and volcanic activity is increasing, nine volcanoes around the country have been announced as "Around the crater warning" and one submarine volcano has been announced as an "eruption warning (surrounding sea area)".

9 volcanoes around the crater

The crater area warning has been announced as a possible future eruption may affect the vicinity of the crater and the neighborhood.
▽ "Mount Shirane", "Mount Asama" of Kusatsu Shirane in Gunma Prefecture,
▽ “Hakone” in Kanagawa Prefecture
▽ “Mt. Aso” in Kumamoto Prefecture,
▽ Sakurajima, Kuchinoerabujima, Suwanosejima in Kagoshima Prefecture,
▽ A total of 9 volcanoes, “Nishinoshima” and “Iwojima” in the Ogasawara Islands.

Eruption caution level 3 is 1 volcano

Of these, eruption warning level 3 indicating “Iriyama regulation” has been announced in “Sakurajima”, which may affect the vicinity of the place of residence.

At the Minamidake summit crater on Sakurajima, eruption activity was slow, but very small eruptions occurred occasionally.

Magma accumulates in the deep underground of the Aira caldera in the depths of Kagoshima Bay, and the amount of volcanic gas released per day continues to be slightly higher.

For this reason, the Japan Meteorological Agency believes that eruptions may occur around the Minamidake summit crater.

On top of that, in the area of ​​about 2 km from the Minamidake summit crater and the Showa crater, we are calling for caution against large cinders and pyroclastic flows.

Eruption caution level 2 is 6 volcanoes

The eruption warning level 2 where access to the area around the crater is restricted is Mt. Shirane, Mt. Asama, Mt. Hakone, Mt. Aso, Kuchinoerabujima, and Suwayuki of Kusatsu Shirane. It is announced in six volcanoes of “Sejima”.

<Mt. Asama>
A small eruption occurred at the summit crater on August 7, raising the eruption alert level to 3.
After that, no crustal movement indicating the rise of magma from deep underground was observed, and the volcanic ash contained almost no grains considered to be new magma.
For this reason, the Japan Meteorological Agency lowered the eruption alert level to 2 on August 19, assuming the possibility of a larger eruption is low.
However, a small eruption occurred on the 25th.
For this reason, the Japan Meteorological Agency is wary of large volcanic blocks and pyroclastic flows in the range of about 2 km from the summit crater, so that small eruptions may occur in the future. I am calling.

<Mt. Hakone>
Although it has gradually decreased since the volcanic earthquake increased in May, it has not returned to a state less than before.
Around Hakone, crustal movements indicating mountain swelling have also been observed.
Active fumarolic activity continues around Owakudani.
The Japan Meteorological Agency is alert to large volcanic blocks in the assumed crater area around Owakudani, calling for not entering dangerous areas according to the instructions of local governments, assuming volcanic activity has increased.

<Mt. Aso>
The eruption that occurred at the Nakadake Daiichi crater on July 28 continued until August 16.
Since then, there have been intermittent eruptions.
The amount of volcanic gas released was temporarily very high from late July to early August, and remained relatively high thereafter.
Volcanic activity is increasing as the ground temperature in the crater continues to be high.
The Japan Meteorological Agency is cautious of large cinders and pyroclastic flows within the range of about 1 km from Nakadake No. 1 crater, and calls on not entering dangerous areas according to instructions from local governments.

<Mt. Shirane of Kusatsu Shirane>
Although there are few volcanic earthquakes in the shallow area near Yugama, it continues to occur.
The concentration of components from hot volcanic gas in the water in the kettle continues to be high.
The Japan Meteorological Agency has called for a large volcanic block to be cautious about 1 kilometer from Yugama crater, as small-scale steam eruptions may continue.

<Kuchinoerabujima>
No eruptions have been observed since February, but volcanic gas emissions have remained somewhat high.
The Japan Meteorological Agency has called for warning of large cinders and pyroclastic flows approximately 1 km from the crater, and pyroclastic flows approximately 2 km west of the crater, as there is a possibility of a small eruption.

<Suwanosejima>
There were frequent eruptions at the Mitake crater in August.
The Japan Meteorological Agency is calling for caution against large cinders associated with eruptions in the range of about 1 km from the crater, as there is a risk of eruptions affecting the crater area.

2 volcanoes around the crater

Although no eruption warning level has been introduced, “Nanojima” and “Iwojima” in the Ogasawara Islands have been announced.

<Nishinoshima>
Volcanic activity has clearly decreased compared to around July last year when the eruption was confirmed.
Although the possibility of eruption is low, fumarole has been confirmed near the crater.
The Japan Meteorological Agency has called for attention to large volcanic blocks in the range of about 500m from the crater, as attention should be paid to future volcanic activity.

<Iwo Jima>
It is estimated that a submarine eruption occurred in September last year, and there are fluctuations that indicate the uplift of the ground.
The Japan Meteorological Agency has called for caution as volcanic activity is somewhat active and there may be an eruption that affects the crater area.

“Eruption warning (surrounding sea area)” in “Fukutokuoka Noba”

At Fukutokuoka Noba, a submarine volcano near the Ogasawara Islands, an eruption warning (surrounding sea area) has been announced as an eruption that may affect the surrounding sea area.

In the vicinity, discoloration of the sea surface, which seems to be due to volcanic activity, has been confirmed.

The Japan Meteorological Agency has called for vigilance in the surrounding waters as a small-scale submarine eruption is expected.

No alarm / Level 1 risk awareness

There are no volcanic eruption warnings among active volcanoes across the country, and there are volcanic eruptions with a level 1 eruption alert level, but this is still an active volcano that has repeatedly erupted in the past.

Although the eruption alert level is 1 at Yakedake in the Northern Alps on the border between Nagano and Gifu, volcanic earthquakes with air vibrations have frequently occurred since July 27, and the Japan Meteorological Agency has called for attention to future volcanic activity. The

Check the latest volcano information

You can check the status and precautions of volcanic activity in each region on the Japan Meteorological Agency, local meteorological observatories, and local government websites.

Source: nhk

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