Summary of volcanoes nationwide "Near crater warning" is being announced for nine volcanoes. Japan Meteorological Agency, April 8, 19:46

The Japan Meteorological Agency announced on March 8 the status of active volcanoes nationwide from March to April, 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 increasing volcanic activity.

"Crater warning" is 9 volcanoes

The `` crane periphery warning '' has been announced as `` crane periphery warning '' because there is a possibility that the future eruption may affect the vicinity of the crater and the vicinity of the residential area
「Mt. Aso in Kumamoto Prefecture
「Shinmoedake on the Kirishima Mountains on the prefectural border between Kagoshima and Miyazaki
「Sakurajima, Kuchierabujima, Satsuma Iwojima, Suwanosejima in Kagoshima Prefecture
▽ There are 9 volcanoes in total, Nishinoshima and Iwojima in the Ogasawara Islands.

"Eruption Warning Level 3" is 2 volcanoes

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

<Kuchierabujima>
No eruptions occurred in March, but they do occur frequently in April. Although volcanic earthquakes have fluctuated, they continue to be in a large state, and a large amount of volcanic gas emissions continue.
From around January, volcanic activity has been increasing, with crustal movements indicating the bulging of mountains being observed.
The Japan Meteorological Agency calls for continuing eruption alert level 3 to be alert to large cinders and pyroclastic flows within a range of approximately 2 km from the crater, and to be alert to pyroclastic flows from the crater to the shore from the Mukaihama area to the southwest of Shindake. .

<Sakurajima>
An eruption continues at the Minamidake summit crater.
In March, 26 eruptions were observed, 10 of which were explosive eruptions, all of which were smaller than the previous month.
Volcanic plumes rose up to 3000 meters from the crater, with large cinders reaching the 4th station from 1300 meters to 1700 meters from the crater.
At the Minamidake summit crater, crustal movements that are thought to indicate the bulge of the mountain are seen, and the state of high volcanic gas emission continues, so there is a possibility that eruptions may occur mainly at the Minamidake summit crater in the future is.
The Japan Meteorological Agency calls for alerting to large cinders and pyroclastic flows within a range of approximately 2 km from Minamidake summit crater and Showa crater.

"Eruption Warning Level 2" is 5 volcanoes

Eruption caution level 2, where access to the area around the crater is restricted, is "Mt. Shirane" in Mt. Kusatsu-Shirane.
▽ Mt. Aso
「Shinmoedake of Kirishima Mountains
▽ "Satsuma Iwo Jima"
５It has been announced at five volcanoes in Suwanosejima.

<Shinmoedake of Kirishima Mountains>
The frequency of volcanic earthquakes has been increasing and decreasing in March, but the frequency of the increase in March has increased significantly from 884 times a month to 305 times the previous month.
On March 2, two short-volume volcanic tremors with small amplitudes were observed.
In addition, near the crack on the west slope of the crater, the area with high heat has spread slightly since early March.
The Japan Meteorological Agency calls for alerting large cinders about 2 km from the crater and pyroclastic flows about 1 km 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.
Volcanic tremors with small amplitudes occurred from March 28 to 29, and slightly steep slope changes were also observed.
The Japan Meteorological Agency has called for vigilance against large cinders, approximately one kilometer from the Yugama crater, as small phreatic eruptions may continue to occur.

<Mt. Aso>
Eruptions continue at Nakadake No. 1 crater.
The amplitude of volcanic tremors has been generally small.
Volcanic gas emissions per day are still high at 1400 to 4900 tons, and the state of volcanic activity continues to increase.
The Japan Meteorological Agency is cautious of large cinders and pyroclastic flows within 1 km of 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 gas is reflected in clouds and plumes, and a red fire is observed. The volcanic plume sometimes rises, and the 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.

<Suwanosejima>
Active eruptions continue at the Mitake crater.
March eruptions occurred occasionally, two of which were explosive eruptions.
The volcanic plume reached a maximum of 1000 meters from the crater, and a large cinder reached 300 meters from the crater.
The Japan Meteorological Agency has warned of large cinders within a range of about 1 km from the crater, as there is a possibility of an eruption affecting the crater.

"Crater warning" is two volcanoes

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

<Nishinoshima>
Eruptions have been observed intermittently.
According to observations made by the Japan Coast Guard in March, the plumes rose up to 1,000 meters, and lava reached the coast from the middle of the pyroclastic hill to the north side of the island.
No large cinders were seen falling on the sea.
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 (surrounding sea area)" for submarine volcano "Fukutokuoka Noba"

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

"No alarm" and "Level 1" also recognize risks

In addition, eruption warnings have not been announced among active volcanoes nationwide, and there are volcanoes with an eruption alert level of 1, but these are active volcanoes that have 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 significant signs.

Check the latest volcano information

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