Overview of volcanoes nationwide (July) “Crater alert” for 10 volcanoes nationwide 21:13 on August 11

The Japan Meteorological Agency announced on July 11 the activity status and caution points of active volcanoes nationwide in July. It has been announced that 10 volcanoes nationwide have a "crater alert" and one submarine volcano has an "eruption alert (surrounding sea area)" because eruptions and volcanic activity are increasing.

10 volcanoes around the crater

The "crater peripheral alarm" as there is a risk that is affected in the vicinity of the crater of and around residential areas in a future eruption has been announced
▽ "Shirane" of Shirane Kusatsu Gunma Prefecture
▽ Nagano and Gunma "Mt. Asama" on the prefectural border ▽
"Mt. Aso" on Kumamoto prefecture ▽
"Shinmoedake" on the Kirishima mountain range on the prefectural border between Kagoshima and Miyazaki
▽ "Sakurajima", "Kuchierabujima" and "Satsuma Iwojima" in Kagoshima "Suwa Nosejima"
▽A total of 10 volcanoes, "Nishinoshima" and "Iwojima" in the Ogasawara Islands.

Eruption alert level 3 is 2 volcanoes

Of these, eruption warning level 3 indicating "climbing restrictions", which may affect the neighborhood of the residence, has been announced on "Sakurajima" and "Kuchinoerabujima."

<Kuchinoerabujima>
No eruption has been observed on Kuchinoerabujima since May 14th.

The number of volcanic earthquakes was 36 times, which was lower than the previous month, but the daily amount of volcanic gas released was 300 to 700 tons, which remains rather high.

From around October last year, crustal movements showing swelling of mountains were observed, and the accumulation amount of underground magma was comparable to the state before the explosive eruption of 2015 when all the residents temporarily evacuated to the island. I am.

As a result, it is possible that volcanic activity will be comparable in 2015.

The Japan Meteorological Agency calls for warning of large volcanic blocks and pyroclastic flows within a range of approximately 2 kilometers from the crater, and pyroclastic flows within the range from the crater from the Mukaihama area to the southwest of Shindake to the coast.

<Sakurajima>
No eruption was observed at Sakurajima's Minamidake summit crater after July 9, but an explosive eruption occurred on August 9th, causing smoke to rise to a height of 5000 meters from the crater.

Magma that has been supplied for a long time has accumulated under the Aira caldera in Kagoshima Bay, and since magma continues to be supplied underground, eruption activity will continue to increase mainly at the Minamidake summit crater. There is a possibility.

The Meteorological Agency has called for caution against large volcanic blocks and pyroclastic flows within a range of approximately 2 kilometers from the Minamidake summit crater and the Showa crater.

Eruption alert level 2 is 6 volcanoes

Eruption alert level 2 where access to the area around the crater is restricted is
▽ "Shirane Mountain " of Kusatsu Shirane Mountain ▽ "Mount
Asama"
▽ "Aso
Mountain"
▽ " Shinmoedake" of Kirishima Mountains ▽ "Satsuma Iwo Jima"
▽ "Suwano" It has been announced to six volcanoes in "Sejima".

<
Mt. Asama> Inclination near the summit of Mt. Asama, which is considered to indicate bulging on the west side of the mountain, has continued to change, and satellite observations have also shown a slight change in swelling of the mountain. I will.

Volcanic earthquakes continue to occur, increasing and decreasing, and the temperature inside the crater continues to be high.

The Japan Meteorological Agency has called for caution against large volcanic blocks and pyroclastic flows within a range of approximately 2 kilometers from the crater, as the volcanic activity is increasing and a small eruption may occur in the future.

<Shinmoedake> Shinmoedake in the
Kirishima Mountains has been repeatedly increasing and decreasing volcanic earthquakes, increasing to 53 times a day on July 25.

The daily amount of volcanic gas released is 300 tons, which has been increasing since April, and the volcanic activity has increased slightly.

The Japan Meteorological Agency calls for warning of large volcanic blocks approximately 2 km from the crater and pyroclastic flows approximately 1 km from the crater.

<Satsuma Iwo Jima>
No eruption has been observed on Satsuma Iwo Jima since April 30.

There is no particular change in volcanic earthquakes and crustal movements, but at night, there is a high-temperature volcanic gas reflected in clouds and volcanic plume, which makes it appear red, and sometimes volcanic volcanic clouds cause high thermal activity in the long run. It has continued to rise.

The Meteorological Agency has called for warning of large volcanic blocks, roughly 1 km from the crater.

<Suwanosejima>
Active eruption activity continued at the Mitake crater on Suwanosejima, with the highest plume rising up to 2000 meters from the crater.

The Japan Meteorological Agency has called for warning of large volcanic blocks within a range of about 1 km from the crater, as there is a risk of eruption affecting the crater area in the future.

<Mt. Shirane of
Kusatsu- Shirane> At "Shirane-san" of Mt. Kusatsu-Shirane, since the beginning of September 2019, volcanic earthquakes increased in the shallow part near Yugama, and since then it has been hot water. Activity remains moderately high, suggesting that small steam eruptions may continue.

The Meteorological Agency has called for vigilance for large volcanic blocks, approximately 1 km from the Yugama crater.

<Mount Aso>
No eruption has been observed on Mount Aso since late June.

The volcanic tremor amplitude is generally small, and the daily volcanic gas emission is somewhat low from 600 to 700 tons, indicating a tendency for volcanic activity to decline.

The Meteorological Agency cautions against large volcanic blocks and pyroclastic flows within a range of about 1 km from the Nakadake No. 1 crater, and urges local authorities not to enter dangerous areas.

2 volcanoes with no level warning

Although the eruption alert level has not been introduced, the "crater area warning" has been announced for "Nishinoshima" and "Iwojima" in the Ogasawara Islands.

<Nishinoshima> In
July, an observation conducted by the Japan Meteorological Agency confirmed a vigorous eruption that ejected a large amount of volcanic ash.

From meteorological satellites, volcanic plumes rising up to about 4,000 meters from the crater have been continuously confirmed.

On the other hand, the rise in the temperature of the ground surface, which had been confirmed by the satellite, decreased after mid-July and has disappeared.

Observations from the sky indicate that gray volcanic ash has accumulated thickly from the center to the north of the island, and it is probable that lava and large volcanic blocks have disappeared since mid-July.

Although the Japan Meteorological Agency showed a decline in volcanic activity, it continued to warn around the crater indicating "Iriyama danger", saying that vigorous eruption activity accompanied by eruption of volcanic ash continued, and large volcanic rocks within approximately 2.5 km from the summit crater. We are calling attention to the lava flow.

<Iwo Jima>
Iwo Jima, which is estimated to have undergone a seafloor eruption in September 2018, shows fluctuations that indicate the uplift of the ground and the volcanic activity has remained rather active due to the increase in the ground temperature of the entire island. doing.

The Japan Meteorological Agency has called for caution as there is a risk of an eruption affecting the crater area.

"Fukutoku okanoba" "eruption warning (surrounding sea area)"

At "Fukutoku Okanoba", an undersea volcano near the Ogasawara Islands, an "eruption warning (surrounding sea area)" has been announced as a risk of eruption affecting the surrounding sea area.

The area around the area is somewhat active, with discoloration of the sea surface, which is thought to be due to volcanic activity, confirmed.

The Japan Meteorological Agency has called for caution in the surrounding waters, as it anticipates a small seabed eruption.

No warning ・Level 1 is risk recognition

No eruption warning has been announced among active volcanoes nationwide, and there are volcanoes with an eruption alert level of 1. However, it is still an active volcano that has repeatedly erupted in the past.

In Sakurajima, a large eruption flew over the current eruption alert level 3 due to the explosive eruption on June 4, but the eruption alert level could not be raised because it was not caught by the surveillance camera.

In addition, volcanic activity is changing even at level 1, such as a fire screen observed since 2000 on Tokachidake in Hokkaido on June 7.

It is also necessary to recognize once again that a sudden eruption can occur in the absence of noticeable signs.

Check the latest information

You can check the activity status and cautions of volcanoes in each area on the website of the Meteorological Agency, local meteorological stations, and local governments.