After the eruption of The Tonga Volcano, we once again realized the power of volcanic eruptions, but for us living in the land of China, although we know that volcanoes are terrible, there are only 14 active volcanoes that have been discovered on the mainland, and they are all in a dormant period, so we will not feel afraid.
But Japan is not so calm, don't look at the size of Japan's land area, but there are many volcanoes, there are 111 active volcanoes alone, including Mount Fuji volcano.
Mt. Fuji volcano is a large complex volcano, there have been many different types of eruptions, in the past 2000 years more than the number of eruptions vei-2 times as many as 17 times, of which the last eruption was in 1707, has passed more than 300 years, to know that the average eruption cycle of Mt. Fuji volcano is about 100 years, and it is precisely because of this that the Japanese scientific community and the public are very worried about whether Mt. Fuji volcano will erupt in the near future?
On the other hand, shortly after the eruption of the Tonga volcano, South Korean media reported that the number of spitting fire vents in Mount Fuji in Japan increased by nearly 6 times, from the original 44 to nearly 300 today.
The magma that has accumulated power in Mt. Fuji is also moving, and some Japanese experts have said that it is not surprising when Mt. Fuji erupts.
So the question is, is the frequent volcanic activity of Mt. Fuji related to the eruption of Tonga Volcano?
The formation of volcanoes
Mt. Fuji volcano was formed because it is located at the junction of the Eurasian Plate and the Pacific Plate, of which the Eurasian Plate is a continental plate, the density is small so it is lighter, the Pacific Plate is an oceanic plate, the density is large so it is heavier, when the two plates meet, the heavier oceanic plate will swoop under the continental plate, forming a subduction zone, of which the formation of the Mariana Trench is caused by plate subduction.
When the oceanic plate subducts, sedimentary rocks, basalt and seawater are carried together into the depths of the mantle, and the mantle layer is very hot, resulting in constant deterioration and dehydration of subducted material.
When the subduction plate reaches a depth of 80 kilometers, the hornblende decomposes, releasing water and other volatile substances, lowering the mantle solid phase line, making the mantle melt, magma upwelling, forming a volcanic eruption, which is: subduction zone volcano, the Tonga volcano of this eruption is located in the plate subduction zone, and the Japanese Mount Fuji volcano is also located in the plate subduction zone, and the two are similar in cause.
Will the Tonga volcano affect Mount Fuji in Japan?
In general, the volcanic system is relatively independent, and the eruption of the Tonga volcano does not cause the eruption of Mount Fuji in Japan. This is because volcanic eruptions need to meet 3 conditions at the same time: there is magma underneath, there is a volcanic channel, and there is a power to make the magma surge.
The magma at the bottom is very critical, there is a hot magma chamber at the bottom of the volcano, and the magma chamber of each volcano is relatively independent, these magma chambers have a large amount of high-temperature material, as well as volatile components, but due to the accumulation of rocks above, when the pressure inside the magma chamber is insufficient, the magma in the magma chamber is difficult to rise to the surface. When the magma accumulates enough and the internal pressure is very large, the magma will break through the rock and rush up to the ground, forming a volcanic eruption.
If there is not enough magma in the magma room at the bottom of Mt. Fuji, even if there is a volcano erupting nearby, it will not cause it to erupt, for the simple reason that there are no raw materials. But when there is enough magma at the bottom of Mt. Fuji, it can still erupt even if there is no volcanic eruption around.
Will Mount Fuji erupt in the near future?
Mt. Fuji erupts on average every 100 years, and today Mt. Fuji has not erupted for more than 300 years, raising concerns. In particular, there were many earthquakes near Mt. Fuji last month, and now the number of Spit fire vents in Mt. Fuji has increased nearly 6 times in the South Korean media, from 44 to nearly 300 now, all of which have made the Japanese very uneasy and worried about whether it will erupt in the near future.
People's concern about Mt. Fuji is not justified, because although Mt. Fuji is not a supervolcano like Yellowstone Volcano, it is closer to Tokyo and Osaka, and once a large-scale eruption occurs, such as an eruption above VEI-5, it is enough to bring serious losses to Japan, of which volcanic ash can reach Tokyo within 2 hours, which has a very large impact on Japan's economy and people's livelihood security.
It is precisely because of this that Japan attaches great importance to Mt. Fuji volcano, coupled with the large number of volcanoes in Japan, the study of volcanoes is also relatively deep, and monitoring points have been set up near many volcanoes, and Mt. Fuji volcano is a volcano that is artificially monitored.
Scientists will through a variety of ways, to explore the size of the internal magma, magmatic activity, etc., volcanoes are different from earthquakes, before the eruption will often have a variety of signs, such as: internal magmatic activity caused by mountain deformation, or caused by earthquakes, magma close to the ground, the nearby temperature will also rise, will cause the mountain ice and snow melting, etc., through these monitoring data, generally can calculate the approximate time and scale of volcanic eruptions, the success rate is still very high.
However, Japan has not issued an early warning of the eruption of Mt. Fuji, indicating that it is still relatively safe today.
#Does The Tonga volcano cause the great eruption of Mt. Fuji in Japan##The number of fire vents in Mount Fuji in Japan has increased by nearly 6 times##Japanese experts say it is not surprising when Mt. Fuji erupts##Japan##汤加火山喷发 #