Overview of volcanoes nationwide Nine volcanoes "Around the crater warning" March 9 23:43

The Japan Meteorological Agency announced on September 9 the activity status of active volcanoes nationwide from February to March and points to watch out for. Nine volcanoes nationwide have reported "Crater warnings" and one submarine volcano has "Eruption warnings (peripheral waters)" for eruptions and increased volcanic activity.

Crater warning around 9 volcanoes

The crater warning has been announced as a possible eruption that could affect the area around the crater and near the residential area,
草 “Shirane Mountain” of Kusatsu Shirane Mountain in Gunma Prefecture,
▽ Mt. Aso in Kumamoto Prefecture,
「Shinmoedake, located on the Kirishima Mountains on the prefectural border between Kagoshima and Miyazaki,
▽ Sakurajima, Kuchierabujima, Satsuma Iwojima, Suwanosejima, Kagoshima Prefecture,
▽ There are 9 volcanoes in total, “Nishinoshima” and “Iwojima” in the Ogasawara Islands.

Eruption caution level "3" 2 volcanoes

Among them, eruption caution level 3, which indicates that there is a risk of affecting the vicinity of the place of residence and indicates "restriction on entering mountains," has been announced in "Sakurajima" and "Kuchierabujima".

<Kuchierabujima>
Eruptions occasionally occurred, and on February 3, a large cinder reached approximately 600 m from the crater, and pyroclastic flows ran down to a maximum of 1.5 km. In this eruption, plumes reached a height of 7000 m.
On February 11, volcanic tremors accompanied by tilt changes indicating the bulging of the mountain occurred, and subsequently there were many volcanic earthquakes.
Volcanic activity is increasing, as the state of large volcanic gas emissions continues.
The Japan Meteorological Agency continues eruption alert level 3,
に A large cinder or pyroclastic flow within 2 km from the crater,
て い ま す In the area from the crater from the Mukaihama area to the southwest of Shindake to the coast, we are calling for caution against pyroclastic flows.

<Sakurajima>
An eruption continues at the Minamidake summit crater.
129 eruptions were observed in February, of which 67 were explosive.
The volcanic plume reached a maximum of 2600m from the crater, and a large volcanic block reached the third station, 1800m from the crater.
The Japan Meteorological Agency has called for warning of large volcanic blocks and pyroclastic flows within a range of approximately 2 km from the Minamidake summit crater and Showa crater, as eruptions may continue to occur around the Minamidake summit crater.

Eruption caution level "2" 5 volcanoes

Eruption caution level 2, where entry around the crater is regulated,
▽ “Shirane Mountain” of Kusatsu Shirane Mountain,
▽ Mt. Aso,
「" Shinmoedake "of the Kirishima Mountains,
▽ "Satsuma Iwo Jima",
▽ It has been announced at five volcanoes, Suwanosejima.

<Shinmoedake>
The frequency of volcanic earthquakes has been increasing and decreasing in February, but the frequency of the increase has increased in February, 305 times a month, up from 88 in the previous month.
On February 20, volcanic tremor was observed since October 2018.
Volcanic activity has continued to increase, with fumaroles being observed near the crack on the western slope of the crater since July 2019.
The Japan Meteorological Agency
に A large cinder within about 2 km from the crater,
て い ま す We are calling for caution on pyroclastic flows within a range of about 1 km.

<Mt. Aso>
Eruptions continue at Nakadake No. 1 crater.
The amplitude of volcanic tremors increased from time to time.
There are many volcanic earthquakes, and the amount of volcanic gas released per day is as high as 1500 to 4800 tons, and the state of volcanic activity continues to increase.
The Japan Meteorological Agency is wary of large cinders and pyroclastic flows within 1 km from Nakadake No. 1 crater, and instructs local governments and others not to enter dangerous areas.

<Satsuma Iwo Jima>
No eruptions have been reported since November 3, 2019.
At night, high-temperature volcanic gases are reflected in clouds and plumes, and red-colored fires are observed. The volcanic plumes sometimes rise, and thermal activity continues to increase over the long term.
The Japan Meteorological Agency has called for vigilance against large cinders, approximately one kilometer from the crater.

<Shirane of Kusatsu-Shirane>
Since early September 2019, volcanic earthquakes have slightly increased in shallow areas near Yugama, and tilt changes indicating expansion in shallow areas of Yugama have been observed.
The Japan Meteorological Agency has called for vigilance against large cinders within approximately one kilometer of the Yugama crater, stating that small phreatic eruptions may continue.

<Suwanosejima>
Active eruption activity continues at the Mitake crater.
Eruptions occurred intermittently in February, two of which were explosive eruptions.
The volcanic plume reached a maximum of 1600m from the crater, and a large cinder reached 700m from the crater.
The Japan Meteorological Agency has called for caution on large cinders within a range of about 1 km from the crater, as eruptions may continue to affect the area around the crater.

Crater warning 2 volcano

Although no eruption alert level has been introduced, "Nishinoshima" and "Iwo Jima" in the Ogasawara Islands have been announced with "Around the crater warning".

<Nishinoshima>
Eruptions have been observed intermittently.
According to observations made by the Japan Coast Guard from above in February, plumes rose to a maximum of 2700 m and lava flowed in the southeast direction of the pyroclastic cone, but large cinder cones did not fall onto the sea. did.
The Japan Meteorological Agency has warned that eruptions may continue in the future, and has continued to warn around the crater indicating “danger of entering the mountain,” calling for caution over large volcanic blocks and lava flows within a range of approximately 2.5 km from the summit crater.

<Iwojima>
At Iwo Jima, where a submarine eruption was presumed to have taken place in September 2018, volcanic activity has been somewhat active, with fluctuations indicating the uplift of the ground being observed, as well as a rise in ground temperature throughout the island. .
The Japan Meteorological Agency has warned that eruptions that could affect the area around the crater may occur.

Eruption warning (surroundings)

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

The surrounding area is a little more active, with discoloration of the sea surface being observed due to volcanic activity.

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

Eruption caution level 1 may cause sudden eruption

Eruption warnings have not been announced, and some volcanoes have an eruption alert level of 1. However, this is still an active volcano that has repeatedly erupted in the past.

Volcanic activity has changed even at level 1, such as a temporary surge in volcanic earthquakes at Tokachidake in Hokkaido in February.

In August 2019, an eruption occurred at Mount Asama at Level 1 and the level was raised immediately after.

Even if the eruption alert level is at the lowest level, it is necessary to recognize again that sudden eruptions can occur without noticeable signs.

Check the latest volcano information

You can check the activity status and precautions of volcanoes in various places on the Japan Meteorological Agency, local meteorological observatories, and local government websites.