On the 8th, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide in November and points to be wary of.
"Crater area warning" has been announced for 9 volcanoes nationwide, and "eruption warning (surrounding sea area)" has been announced for one submarine volcano, saying that 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.
▽ Nagano prefecture "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"
▽ There are 9 volcanoes in total, "Nishinojima" and "Iojima" in the Ogasawara Islands.
Eruption alert level 3 is 2 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" and "Kuchinoerabujima".
<Sakurajima> At
the summit crater of Mt. Minamidake in Sakurajima, eight eruptions occurred, of which six exploded.
The explosion has been observed since August 9th.
The amount of volcanic gas released was generally high, ranging from 1300 tons to 2200 tons per day.
Since the magma supplied for a long period of time has accumulated under the Aira Caldera in Kagoshima Bay and the amount of volcanic gas released continues to be high, eruptive activity will continue centering on the Minamidake summit crater. It is said that it may be activated.
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 30th.
The amount of volcanic gas released is declining, but it remains at a slightly higher level of 50 to 200 tons per day.
The number of volcanic earthquakes decreased from 866 in October to 220 in November.
On the other hand, the amount of magma accumulated underground is comparable to the state before the explosion in 2015, when all the inhabitants temporarily evacuated to the outside of the island, based on the observation results of crustal movements.
The Meteorological Agency, as is a possibility to develop into volcanic activity comparable to that of five years ago,
from the crater ▽, the large cinder and pyroclastic flow in the range of approximately 2 kilometers
from the crater of over the southwest of Shindake from ▽ pick beach district Up to the coast, we are calling for caution against pyroclastic flows.
Eruption alert level 2 is 5 volcanoes
Volcanic Alert Level 2 Access to the crater around is regulated is,
of ▽ Shirane Kusatsu "Shirane"
▽ "Asama"
"Shinmoedake" of ▽ Kirishima mountain range
▽ "Iwo Jima Satsuma"
of ▽ "Suwanose" It has been announced in 5 volcanoes.
<Mt. Shirane of Mt.
Kusatsu-
Shirane> At Mt. Shirane of Mt.
Kusatsu-Shirane, volcanic earthquakes have increased in the shallow area near Yugama since early September 2019, and have continued to occur thereafter.
Hydrothermal activity remains rather high, and 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.
<Mt. Asama>
Volcanic earthquakes continue to occur on
Mt.
Asama, increasing and decreasing, but the number is generally low.
Volcanic plume and volcanic gas emissions have continued to increase compared to before June.
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-scale eruptions may occur in the future.
<Shinmoedake> At Shinmoedake in the
Kirishima mountain range, volcanic earthquakes have been increasing and decreasing repeatedly, but since mid-October, it has been on a downward trend. did.
There was also no growth in crustal movements, indicating that underground magma was accumulating.
From these facts, it is considered that the possibility of eruption is decreasing.
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.
<Satsuma Iojima>
No eruptions have been observed on Satsuma Iojima since October 7.
There are no particular changes in volcanic earthquakes or crustal movements, but thermal activity has continued to increase over the long term, with "fire projection" observed at night and occasional high smoke.
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 1 km from the crater.
<Suwanosejima> At
the Mitake crater on Suwanosejima, eruptive activity has been active since late October, and 105 explosions have occurred.
The Japan Meteorological Agency has repeatedly erupted for a long period of time, and has called for caution against large volcanic bombs within a range of approximately 1 km from the crater, saying that there is a risk of eruptions affecting the area around 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.
The Japan Meteorological Agency believes that eruptive activity has almost stopped since September, and that volcanic activity is on a downward trend.
However, we continue to warn around the crater, indicating that there is a possibility that the eruption may resume in the future, and call for caution against large volcanic bombs and lava flows within a range of approximately 2.5 km from the summit crater.
<Iwo Jima>
On Iwo Jima, which is estimated to have had a submarine eruption in September 2018, volcanic activity is somewhat active, with fluctuations indicating uplift of the ground and a rise in the ground temperature of the entire island. It is changing.
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.
In the surrounding area, discoloration of the sea surface, which is thought to be due to volcanic activity, has been confirmed.
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
Among the active volcanoes nationwide, no eruption warning has been announced, and there are volcanoes with an eruption alert level of 1, but they are still active volcanoes that have repeatedly erupted in the past.
Volcanic activity has changed even at level 1, such as the first fire projection since 2000 on June 7 at Tokachidake in Hokkaido.
It is also necessary to recognize again that a sudden eruption can occur in the absence of any noticeable precursors.
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.