Sure enough, the mudslides in Japan that have killed 11 people are a man-made disaster | mudslides | Japan_sina news

Original title: Sure enough, the Japanese mudslide that has killed 11 people is a man-made disaster

　　[文/观察者网 鞠峰]Earlier this month, a large-scale mudslide occurred in Mount Izu, Atami City, Shizuoka Prefecture, Japan. As of now, 11 people have died and 17 people are missing. According to the “Mainichi Shimbun” report, Shizuoka Prefecture announced the cause of the disaster today (13th). The previous speculation came true, and it was indeed a man-made disaster.

“The cause of the disaster was illegal artificial filling.” Deputy Governor of Shizuoka Prefecture Namba Takashi said in a press conference today.

According to reports, due to rainfall, the artificial fill becomes like a “dam” and continues to accumulate water. Then water spurted from the bottom of the fill, causing part of the fill to collapse, and then the entire fill collapsed.

Japanese media previously reported that Japanese experts estimated that the total volume of this debris flow was about 100,000 cubic meters, of which more than half may be artificial filling.

Filling refers to pile up sand on the lower foundation and slope to form a flat ground or construction project higher than the surroundings, and also refers to the piled sand.

It is worth noting that Namba Takashi explained that the fill in the accident was located on the top of a ravine where water was easy to accumulate, and construction was carried out illegally from the declaration form, and the height of the filling exceeded the 15 meters specified in the declaration form , The construction method is improper.

Presumably,The maximum height of the fill has exceeded 50 meters, So the possibility of not being equipped with proper drainage facilities is high.

According to the announcement by Shizuoka Prefecture, the accumulated rainfall was about 450 mm from 4 am on July 1st to 10 am on the 3rd before the mudslide occurred. The rainfall is the highest in 10 years.

Nanbo emphasized, “Improper filling construction method, coupled with continuous rainfall and rainwater accumulation, eventually led to tragedy(Catastrophe). ”

Atami City notified on the 13th that a new body was found at the disaster site. The disaster caused 11 deaths and 17 people are missing. According to the latest statistics, this large-scale mudslide caused 131 houses (128 households, 216 people) to be damaged; as of the 13th, 521 people are taking refuge.

In fact, the results announced by the Shizuoka Prefecture Government are not surprising. Previous follow-up reports by Japanese media and investigations by relevant departments have shown that mudslides may be related to human factors.

According to a report from the Japan Broadcasting Association (NHK) on the 4th, in the evening of the same day, Shizuoka Prefecture held a “Countermeasure Headquarters Meeting” regarding the mudslide disaster, and released the initial investigation results of the mudslide, revealing some disturbing information— -This debris flow may not only be related to natural conditions such as precipitation, but also to human factors.

According to estimates by experts at the conference, the total volume of debris flow is about 100,000 cubic meters, of which more than half (about 54,000 cubic meters) may be filled. These fills came from a mountain near the disaster area, where the source of the mudslide was located.

It is reported that after comparing the data of 2010 and 2020, experts believe that in the valley where the mountain is located, the area about 200 meters from east to west and 60 meters from north to south are covered with fill.

According to the footage taken by the drone, there were “scars” of about 100 meters on the mountain where the incident occurred, and 100,000 cubic meters of sand, including the fill, poured down from here, at a speed of tens of kilometers per hour. Engulfed the residents and buildings under the mountain.

The satellite image of the Geographical Institute of Japan also shows that in recent years, some vegetation in the mountainous area has been cut down and the land has been filled and leveled.

In the satellite image of the 1970s, the mountain area was luxuriant, and the surface sand was almost invisible. In the satellite image of 2017, it can be seen that part of the vegetation has been cut down and the surface is also showing a stepped land fill. .

A local Shizuoka TV station (テレビ Shizuoka) reported on the evening of the 4th that 15 years ago, the area near the source of the incident was used for development and was ready to be used as a homestead. Therefore, it was logging and filling.

About 10 years ago, this “logged and filled” homestead was sold to another company.

The governor of Shizuoka Prefecture Kawakatsu Heitai also admitted in an interview on the same day that “we are confirming the development of the area near the incident, and one of them is filled with fill for housing construction.”

In addition, the current owner of the land said in an interview with Fuji Television (FNN), “The development has been approved by the local government and there is no problem. But when I bought this land more than 10 years ago, I didn’t know it was filling “.

Shin Yasuda, an honorary professor of Tokyo Denki University, once told NHK that conditions such as filling in the mountains also exist in other parts of Japan, and I hope everyone can realize the risks.

Editor in charge: Liu Guangbo