Activity status of active volcanoes nationwide Japan Meteorological Agency November 11, 19:53
On March 11, the Japan Meteorological Agency announced the activity status of active volcanoes nationwide from October to November and points to watch out for.
As eruptions have occurred and volcanic activity is increasing, eight volcanoes around the country have been announced as “Around the crater warning” and one submarine volcano has been announced as an “eruption warning (surrounding sea area)”.
8 volcanoes around the crater
A total of 8 volcanoes have been announced as “Around the crater warning” because the eruption may affect the vicinity of the crater and the neighborhood.
▽ "Shirane" of Kusatsu Shirane in Gunma
▽ Kumamoto Prefecture "Mt. Aso"
▽ Kagoshima “Sakurajima” “Kuchinoerabujima” “Satsuma Iwojima” “Suwanosejima”
▽ Nishinoshima and Iwojima in the Ogasawara Islands
"Eruption warning level 3" is 2 volcanoes
Of these, eruption warning level 3 indicating “Iriyama regulation” has been announced in “Sakurajima” and “Kuchinoerabujima” which may affect the vicinity of the place of residence.
<Sakurajima>
Active eruption activity continues at the Minamidake summit crater in Sakurajima. 62 eruptions were observed in October, 41 of which were explosive eruptions.
The volcanic plume rose up to 3000 meters from the crater, and a large volcanic block reached the 4th station from 1300 meters to 1700 meters from the crater.
In addition, the explosive eruption on 8 November reached a height of 5500 meters from the crater.
The volcanic plume has reached 5,000 meters or more since 2016 at the Showa crater and since 2000 at the Minamidake summit crater.
Changes that appear to be expansion of the mountain body are observed by inclinometers, extensometers, and satellite observations on the island, and the amount of volcanic gas released per day continues to be high.
For this reason, the Japan Meteorological Agency has called for warning of large volcanic blocks and pyroclastic flows in the range of about 2 km from the Minamidake summit crater and the Showa crater, as eruptions may occur mainly in the future.
<Kuchinoerabujima>
On Kuchinoerabujima, the Meteorological Agency has changed its eruption warning level from 2 on October 28, saying that a large-scale earthquake occurred in a shallow area near the crater of Shindake twice in a short period of time and volcanic activity increased. Raised to 3.
In Kuchinoerabujima, no eruptions have been observed since February 3, but there is a large amount of volcanic gas released, and volcanic earthquakes are temporarily high on November 3. The increase and decrease are repeated.
The Japan Meteorological Agency has called for large cinders and pyroclastic flows approximately 2 km from the crater, and to be cautious of pyroclastic flows from the crater from the Mukaihama area to the southwest of Shindake to the coast.
"Eruption warning level 2" is 4 volcanoes
Eruption warning level 2 is restricted to four volcanoes, where access to the crater area is restricted.
▽ Mt. Shirane of Kusatsu Shirane
▽ "Mt. Aso"
▽ "Satsuma Iwo Jima"
▽ "Suwanosejima"
<Satsuma Iwo Jima>
An eruption occurred at Satsuma Iwojima on November 2, and the grayish white smoke rose to just over 1000 meters from the crater.
Following this eruption, the Japan Meteorological Agency raised the eruption alert level from 1 to 2.
It has been since June 2013 that an eruption was observed at Satsuma Iwojima.
According to the field survey conducted by the Japan Meteorological Agency on the end of October and November 6, the amount of volcanic gas released per day was about 300 to 1400 tons.
The Japan Meteorological Agency has called for a large volcanic block to be watched about 1 kilometer from the crater, as small eruptions may occur in the future.
<Mt. Aso>
At Mt. Aso, the eruption continues at the Nakadake Daiichi crater.
In October, the amplitude of volcanic tremors gradually increased, and is now somewhat larger.
The amount of volcanic gas released continues to be very high, and volcanic activity is increasing.
The Japan Meteorological Agency is cautious of large cinders and pyroclastic flows within the range of about 1 km from Nakadake No. 1 crater, and calls on not entering dangerous areas according to instructions from local governments.
<Mt. Shirane of Kusatsu Shirane>
At Mt. Shirane in Kusatsu-Shirane, volcanic earthquakes have increased in the shallow area near Yukama since early September, and have continued to be somewhat more frequent thereafter.
In addition, tilt fluctuations indicating the expansion of shallow places in Yugama have been observed.
The Japan Meteorological Agency has called for a large volcanic block to be cautious about 1 kilometer from Yugama crater, as small-scale steam eruptions may continue.
<Suwanosejima>.
Eruptions occasionally occurred at the Mitake crater in Suwanosejima.
It has also been frequently observed that a hot gas appears in red at night when it is reflected in fumes and clouds.
The Japan Meteorological Agency is calling for caution against large cinders associated with eruptions in the range of about 1 km from the crater, as there is a risk of eruptions affecting the crater area.
"Danger around the crater" is 2 volcanoes
Although no eruption warning level has been introduced, “Nanojima” and “Iwojima” in the Ogasawara Islands have been announced.
<Nishinoshima>
In Nishinoshima, the volcanic activity is clearly lower than around July last year when the eruption was confirmed. Although the possibility of eruption is low, white fumarole from the crater and discoloration of the sea level on the north side of the island have been confirmed.
The Japan Meteorological Agency has called for attention to large volcanic blocks in the range of about 500 meters from the crater, as attention needs to be paid to future volcanic activity.
<Iwo Jima>
On Iwo Jima, where it is estimated that a submarine eruption occurred in September last year, volcanic activity has been somewhat active, including changes that indicate ground uplift, as well as an overall increase in soil temperature.
The Japan Meteorological Agency has called for caution as there may be an eruption that affects the crater area.
"Eruption warning (surrounding sea area)" at submarine volcano "Fukutokuoka Noba"
At Fukutokuoka Noba, a submarine volcano near the Ogasawara Islands, an eruption warning (surrounding sea area) has been announced as an eruption that may affect the surrounding sea area.
In the vicinity, discoloration of the sea surface, which seems to be due to volcanic activity, has been confirmed.
The Japan Meteorological Agency has called for vigilance in the surrounding waters as a small-scale submarine eruption is expected.
Asama and Hakone are level 1
<Mt. Asama>
At Asama, no eruption occurred since August 26. Volcanic earthquakes have been low since early October, and no crustal movements have been observed, indicating magma rise from deep underground, so the Japan Meteorological Agency lowered the eruption alert level from 2 to 1 on November 6.
Continuing attention to sudden volcanic ash and volcanic gas eruptions, as there is a possibility of a very small eruption that affects the area 500 meters from the crater, I am calling you not to enter.
<Mt. Hakone>
At Hakone, the volcanic earthquake that increased in May decreased in September, and the crustal deformation that is considered to indicate the expansion of the mountain was almost stagnant in October.
For this reason, the Meteorological Agency lowered the eruption alert level from 2 to 1 on October 7, assuming the possibility of an eruption was low in the assumed crater area around Owakudani.
The crater area around Owakudani continues to call attention to sudden eruptions such as volcanic ash.
No alarm / Level 1 risk awareness
There are no volcanic eruption warnings among active volcanoes nationwide, and there are volcanoes with an eruption warning level of 1, but this remains an active volcano that has repeatedly erupted in the past.
Even just this time, eruptions occurred at level 1 on Mt. Asama and Satsuma Iwojima, and the level was raised immediately after. It is necessary to reaffirm that a sudden eruption can occur in the absence of significant omens, even at the lowest eruption alert level.
Check the latest volcano information
You can check the status and precautions of volcanic activity in each region on the Japan Meteorological Agency, local meteorological observatories, and local government websites.