Overview of volcanoes nationwide (October) "Crater area warning" for 9 volcanoes nationwide November 10, 20:01
On the 10th, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide in October 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.
"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 Ioshima" "Suwanosejima"
▽ Ogasawara There are 9 volcanoes in total, including "Nishinojima" and "Iojima" in the islands.
Eruption alert level 3 is 2 volcanoes
Of these, eruption alert level 3, which indicates "mountain entry restrictions", which may affect the vicinity of the place of residence, has been announced on "Sakurajima" and "Kuchinoerabujima".
<Sakurajima> In
Sakurajima, the amount of volcanic gas released increased from 2200 tons to 6600 tons per day, which was much higher than the 1300 tons to 2000 tons in September.
In addition, two eruptions were observed at the Minamidake summit crater, and very small eruptions were frequently observed.
Since the magma supplied for a long period of time has accumulated in the basement of the Aira Caldera in Kagoshima Bay and the amount of volcanic gas released has continued to be rather high, eruptive activity will continue centering on the Minamidake summit crater. It is said that it may be activated.
The Japan Meteorological Agency calls 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 eruption has been observed on Kuchinoerabu Island since the end of August.
On the other hand, the amount of volcanic gas released continues to be rather high at 40 to 300 tons per day.
Volcanic earthquakes increased from the 18th and occurred 235 times on the 19th.
Since then, the number has decreased, but it has continued to increase.
In addition, 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 Japan Meteorological Agency said that it may develop into volcanic activity comparable to that of five years ago, and that large volcanic stones and pyroclastic flows within a range of about 2 km from the crater, from the crater to the southwest of Shindake to the coast The range calls for caution against pyroclastic flows.
Eruption alert level 2 is 5 volcanoes
Eruption alert level 2 where access to the crater area is restricted is
▽ "Mt.
Shirane" of
Mt.
Kusatsu-Shirane
▽ "Mt. Asama"
▽ "Shinmoedake" of the Kirishima mountain range
▽ "Satsuma
Iojima
"
▽ "Suwanosejima" It has been announced to the volcano.
<Mt. Shirane of Mt.
Kusatsu-
Shirane> At Mt.
Kusatsu-Shirane, "Mt. 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> At
Mt. Asama, the slope fluctuation, which is thought to indicate the bulge on the west side of the mountain, has been almost stagnant since mid-August.
However, volcanic earthquakes continue to occur, increasing and decreasing, and the amount of volcanic plume continues to increase compared to before June, when the eruption alert level was raised.
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.
<Shinmoedake>
Volcanic earthquakes are increasing and decreasing at Shinmoedake in the Kirishima mountain range.
In addition, volcanic activity has increased slightly, with the amount of volcanic gas released continuing to increase.
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> A
very small eruption occurred on the 6th at Satsuma Iojima.
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 volcanic plumes.
The Japan Meteorological Agency is calling for caution against large volcanic bombs within a range of approximately 1 km from the crater.
<Suwanosejima>
Active eruptive activity continues at the Mitake crater on Suwanosejima.
The Japan Meteorological Agency 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 was confirmed according to the observation from the sky conducted by the Japan Coast Guard on the 28th.
Observations by meteorological satellites have almost eliminated the rise in surface temperature, and the Japan Meteorological Agency says that eruptive activity has almost stopped.
However, as the eruption may resume in the future, we continue to warn around the crater indicating "danger of entering the mountain" 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 has remained somewhat active, with fluctuations indicating uplift of the ground and a rise in the ground temperature of the entire island. doing.
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 "Fukutoku Okanoba", a submarine volcano 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.
The surrounding area is somewhat active, with discoloration of the sea surface, which is thought to be due to volcanic activity, being 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
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 is changing even at level 1, such as the first fire projection since 2000 on June 7.
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 websites of the Japan Meteorological Agency, meteorological stations in each area, and local governments.