"Crater alert" for 9 volcanoes nationwide Activity status of active volcanoes in May 8:34 on June 9, JMA
The Meteorological Agency announced on May 8 the activity status and caution points of active volcanoes nationwide in May.
It is announced that an eruption has occurred and volcanic activity is increasing.
▽"Crater alert
" is announced for 9 volcanoes nationwide ▽"Eruption alert (surrounding sea)" is announced for one submarine volcano.
9 volcanoes around the crater
"Around the crater warning" has been announced because there is a possibility that future eruptions may affect the vicinity of the crater and the neighborhood of the residential area
▽ "Shirane Mt. Kusatsu Shirane in Gunma Prefecture"
▽ " Kumamoto Prefecture" "Mt. Aso"
▽ "Mt. Shinmoedake" of the Kirishima mountain range on the border of Kagoshima and Miyazaki
▽ "Sakurajima" "Kuchinoerabujima" "Satsuma Iwojima" "Suwanosejima"
▽ "Nishinoshima" of the Ogasawara Islands And "Iwo Jima" are 9 volcanoes in total.
Eruption alert level 3 is 2 volcanoes
Of these, eruption alert level 3 indicating "mountain regulation" that may affect the vicinity of the residence is announced on
▽ "Sakurajima" and
▽ "Kuchinoerabujima."
[Sakurajima] An
eruption continues at Sakurajima's Minamidake summit crater.
In May, 51 eruptions were observed, 24 of which were explosive. Later on, the eruption on June 4 confirmed that large cinders had flown more than 2 km from the crater in the warning area to about 3 km.
A wide range of satellite observations indicates that long-term supplied magma has accumulated under the Aira caldera in Kagoshima Bay. There is.
The Japan Meteorological Agency continues to be alert to eruption level 3 and calls for caution against large volcanic blocks and pyroclastic flows within a range of approximately 2 kilometers from the Minamidake summit crater and the Showa crater.
[Kuchinoerabujima] A
very small eruption occurred on May 5, 6, and 13 on Kuchinoerabujima.
The number of volcanic earthquakes has decreased to 70 times compared to the previous month, but earthquakes have also occurred at the foot of the western side of Shindake (Sanroku), which was the same as before the eruption in 2015 when all the residents were temporarily evacuated.
The amount of volcanic gas released per day has continued to increase while increasing and decreasing from 700 tons to 3400 tons.
Since around January, crustal movements showing bulging of the mountains have been observed, and it seems that underground magma is accumulating.
For this reason, the Japan Meteorological Agency has the possibility of developing volcanic activity comparable to 2015.
The Japan Meteorological Agency continues eruption alert level 3,
▽Large volcanic blocks and pyroclastic flows within a range of approximately 2 km from the crater ▽
We are calling for caution from pyroclastic flows in the range from the crater from the Mukaihama area to the southwest of Shindake to the coast.
Eruption alert level 2 is 5 volcanoes
Eruption alert level 2 where access to the area around the crater is restricted:
▽ "Shirane Mountain
" of Kusatsu Shirane
Mountain ▽ "Aso Mountain"
▽ " Shinmoedake" of "Kirishima Mountain Range" ▽ "Satsuma Iwo Jima"
▽ "Suwa Nose Island" 5 Has been announced to two volcanoes.
[Mt. Shirane of Kusatsu-Shirane] On
"Mt. Shirane" of Mt. Kusatsu-Shirane, volcanic earthquakes increased from the beginning of September 2019 in the shallow part near Yugama, and it was temporarily high on May 31st. became.
Tilt fluctuations have also been observed, indicating expansion in shallow areas of the bath.
The Japan Meteorological Agency has called for warning of large volcanic rocks within a range of approximately 1 km from the Yugama crater, as it may continue to cause small-scale steam eruptions.
[Mt. Shinmoedake]
Volcanic earthquakes have repeatedly increased and decreased at Shinmoedake in the Kirishima Mountains, and on May 27, the number increased rapidly to 181 times a day.
On the same day, a field survey also showed that the amount of volcanic gas released increased to 200 tons.
The Japan Meteorological Agency calls for warning of large volcanic blocks approximately 2 km from the crater and pyroclastic flows approximately 1 km.
[Mt. Aso] At
Mt. Aso, temporary eruptions were intermittent at the Nakadake No. 1 crater, but it has continued since May 22.
The amplitude of volcanic tremors has generally been small.
The volume of volcanic gas released per day skyrocketed to 3000 tons on May 7, 4800 tons on May 8, and has since grown to 1000 to 1300 tons.
The Meteorological Agency cautions against large volcanic blocks and pyroclastic flows within a range of approximately 1 km from the Nakadake No. 1 crater, and urges local authorities not to enter dangerous areas.
[Satsuma Iwo Jima]
No eruption has been observed on Satsuma Iwo Jima since April 30.
There is no particular change in volcanic earthquakes and crustal movements, but at night, a high-temperature volcanic gas is reflected in the clouds and fumes, and a reddish image can be observed, with occasional high fumes. Thermal activity continues to increase.
The Meteorological Agency has called for warning of large volcanic blocks, roughly 1 km from the crater.
[Suwanosejima]
Active eruption activity continued at the Mitake crater on Suwanosejima, with the highest plume rising up to 1000 meters from the crater.
The Meteorological Agency is calling for caution against large volcanic blocks within a range of approximately 1 km from the crater, as there is a risk of eruption affecting the area around the crater.
No level warning is 2 volcanoes
Although the eruption warning level has not been introduced, the "crater area warning" has been announced for "Nishinoshima" and "Iwojima" of the Ogasawara Islands.
[Nishinoshima]
Observations conducted by the Japan Coast Guard from the air on May 18th confirmed that eruptions continued and that the plume had risen 1800 meters from the crater.
The area around Nishinoshima has been confirmed to have a higher temperature than the surrounding area.
The Japan Meteorological Agency has continued to warn around the crater indicating that there is a risk of eruption, and has warned of large volcanic blocks and lava flows within a range of approximately 2.5 km from the summit crater.
[Iwo Jima]
Iwo Jima, which is estimated to have undergone a seafloor eruption in September 2018, shows fluctuations that indicate the uplift of the ground, and the island has a rather high volcanic activity such as high ground temperature. It is changing.
The Japan Meteorological Agency has called for caution as there is a risk of an eruption affecting the crater area.
"Eruption warning (surrounding sea area)" in "Fukutokuoka Noba"
At "Fukutoku Okanoba", an undersea volcano near the Ogasawara Islands, an "eruption warning (surrounding sea area)" has been announced as a possible eruption affecting the surrounding sea area.
It is slightly active in the surrounding area, with discoloration of the sea surface, which is thought to be due to volcanic activity.
The Japan Meteorological Agency has called for caution in the surrounding waters, as a small-scale seabed eruption is expected.
No warning ・Level 1 is risk recognition
In addition, no eruption warning has been announced among active volcanoes nationwide, and there are volcanoes with an eruption alert level of 1. However, it is still an active volcano that has repeatedly erupted in the past.
On Sakurajima, a large volcanic block flew beyond the warning range of eruption warning level 3 announced at the explosive eruption on June 4, but the eruption warning level could not be raised because it was not caught by the surveillance camera.
In addition, volcanic activity is changing even at level 1, for example, a fire screen was observed on 2000 at Tokachidake in Hokkaido since 2000.
It is also necessary to recognize once again that sudden eruptions can occur in the absence of noticeable signs.
Check the latest volcano information
You can check the activity status and cautions of volcanoes in each region on the website of the Meteorological Agency, local weather stations, and local governments.