On the 12th, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide in December last year and points to be wary of.
"Crater area warning" has been announced for 9 volcanoes nationwide, and "eruption warning (peripheral sea area)" has been announced for one submarine volcano as eruptions are occurring and volcanic activity is increasing.
9 volcanoes around the crater
"Mt.
Shirane" of
Mt.
Kusatsu-Shirane in Gunma Prefecture
has been announced as "Crater area warning" because future eruptions may affect the area around the crater and the area where you live.
"Mt. Asama" on the prefectural border of Gunma Prefecture
▽ "Shinmoedake" of the Kirishima mountain range on the prefectural border between Kagoshima and Miyazaki
▽ "Sakurajima" "Kuchinoerabu Island" "Satsuma Iojima" "Suwanosejima"
▽ Ogasawara There are 9 volcanoes in total, including "Nishinojima" and "Iojima" in the islands.
Eruption alert level 3 is 3 volcanoes
Of these, eruption alert level 3, which indicates "mountain entry restrictions" that may affect the vicinity of the place of residence, has been announced on "Sakurajima," "Kuchinoerabu Island," and "Suwanosejima."
<Suwanosejima>.
Volcanic activity is active at the Ontake crater on Suwanosejima.
Explosive eruptions increased after December 21st, and the daily release of volcanic gas increased to 2500 tons on the 26th.
In the explosive eruption on the 28th, a large volcanic bomb reached 1.3 km southeast of the crater.
With this eruption, the Japan Meteorological Agency released an eruption bulletin, and after that, the eruption alert level was raised from 2 of "crater area regulation" to 3 of "mountain entry regulation".
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 2 km from the crater.
<Sakurajima>.
At the summit crater of Mt. Minamidake on Sakurajima, 25 eruptions occurred, of which 18 were explosive.
Large volcanic bombs reached the 4th station, up to 1300 to 1700 meters from the crater, and eruptions rose up to 3500 meters from the crater.
Volcanic gas emissions were generally high, ranging from 1500 to 2900 tons per day.
According to the Japan Meteorological Agency, eruptive activity is gradually increasing in Sakurajima.
In addition, the underground of Aira Caldera in Kagoshima Bay has been accumulating magma supplied for a long period of time, and the amount of volcanic gas released has continued to be large, so an eruption centered on the Minamidake summit crater. The activity may become more active.
The Japan Meteorological Agency is calling for caution against large volcanic bombs and pyroclastic flows within a range of approximately 2 km from the Minamidake summit crater and Showa crater.
<Kuchinoerabu Island>.
No eruptions have been observed on Kuchinoerabu Island since August 30.
The amount of volcanic gas released is generally low, and the number of volcanic earthquakes increased from 220 in November to 284 in December, which is rather high.
The Volcanic Eruption Prediction Liaison Committee said in December that the possibility of a large-scale eruption has decreased because the crustal movement that seems to indicate the accumulation of underground magma seen from around October 2019 is stagnant. It is thought that there is. "
The Japan Meteorological Agency calls for caution against large volcanic bombs and pyroclastic flows within a range of approximately 2 km from the crater, and to be wary of pyroclastic flows from the crater to the coast from the Mukaihama area to the southwest of Shindake.
Eruption alert level 2 is 4 volcanoes
Eruption alert level 2 that restricts access to the crater area
has been announced at four volcanoes:
▽
Mt.
Kusatsu-Shirane
"Mt.
Shirane"
▽ "Mt. Asama"
▽ "Shinmoedake" in the Kirishima mountain range
▽ "Satsuma
Iojima"
..
<Shinmoedake>.
At Shinmoedake in the Kirishima mountain range, the eruption alert level was lowered from 2 to 1 on December 11, due to the decrease in volcanic earthquake activity after mid-October.
After that, the eruption alert level was raised to 2 again on the 25th, as the number of earthquakes with the epicenter directly below the crater increased again from the 18th and the volcanic activity increased.
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 2 km from the crater and pyroclastic flows within a range of approximately 1 km.
<Mt. Shirane of Mt. Kusatsu-Shirane>.
Volcanic earthquakes continue to occur in the shallow area near Yugama at "Mt. Shirane" on Mt. Kusatsu-Shirane.
Hot water activity near the bath continues, and the Japan Meteorological Agency says that small-scale steam eruptions may continue to occur.
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 1 km from the Yugama crater.
<Mount Asama>.
Volcanic earthquakes occur repeatedly on Mt. Asama, but the number is generally low in December.
However, the amount of eruption and volcanic gas emitted continues to be higher than it was before the activity became active in June last year.
The Japan Meteorological Agency has called for caution against large volcanic blocks and pyroclastic flows within a range of approximately 2 km from the crater, saying that volcanic activity is increasing and small eruptions may occur in the future.
<Satsuma Iojima>.
No eruptions have been observed on Satsuma Iojima since October 7.
There is no particular change in volcanic earthquakes and crustal movements, but the thermal activity has continued to increase for a long time, with the "fire phenomenon" observed at night and the eruption sometimes rising. I will.
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 1 km from the crater.
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>.
On Nishinoshima, no eruption has been confirmed since late August by meteorological satellite observations, and although volcanic activity has declined, there are fumaroles and high temperature areas inside the summit crater, and eruptions can resume in the future. It is said that there is sex.
The Japan Meteorological Agency will continue to warn around the crater indicating "danger of entering the mountain", and on December 18, the area requiring caution will be reduced from approximately 2.5 km to 1.5 km from the summit crater, calling for caution against large volcanic bombs and lava flows. I am.
<Iwo Jima>.
Volcanic activity is somewhat active on Iwo Jima, which is estimated to have had a submarine eruption in September 2018, with fluctuations indicating ground uplift, and a very small eruption on the island on December 28. It is in a state of being.
The Japan Meteorological Agency is calling for caution, saying that an eruption that affects the area around the crater may occur.
"Eruption warning (surrounding sea area)" in "Fukutoku Okanoba"
At the submarine volcano "Fukutoku Okanoba" near the Ogasawara Islands, an "eruption warning (surrounding sea area)" has been announced as there is a risk of an eruption affecting the surrounding sea area.
Discoloration of the sea surface, which is thought to be due to volcanic activity, has been confirmed in the surrounding area.
The Japan Meteorological Agency is calling for caution in the surrounding waters, saying that a small submarine eruption is expected.
No alarm, level 1 also risk awareness
No eruption warning has been announced among active volcanoes nationwide, and there are volcanoes with an eruption alert level of 1, but they are still active volcanoes that have repeatedly erupted in the past.
At Tokachidake in Hokkaido, volcanic activity has changed even at level 1 such as the first fire projection since 2000 was observed in June 2020 and volcanic tremor was observed in September.
It is also necessary to recognize again that a sudden eruption can occur in the absence of significant signs.
Check the latest information
You can check the activity status and precautions of volcanoes in each area on the Japan Meteorological Agency, the meteorological stations in each area, and the websites of local governments.