Earthquake-proofing homes to save lives: The surprising effectiveness of "seismic dampers" that control earthquake swaying: In experiments, they withstood magnitude 7 earthquakes 14 times, with zero damage from the Kumamoto and Noto Peninsula earthquakes [Disaster Prevention Week]

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CBCニュース【CBCテレビ公式】

Published on Mar 4, 2024
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(Footage from Suzu City, Ishikawa Prefecture, during the Noto Peninsula earthquake) As I stepped out of the front door, I saw collapsed houses all around. The Noto Peninsula earthquake recorded a maximum seismic intensity of 7, and many homes with low earthquake resistance collapsed. Of those whose causes of death were made public, approximately 90% lost their lives due to the collapse of their homes. In Suzu City, where damage was severe, the earthquake resistance rate for homes was approximately 51 percent. In Wajima City, the rate was only approximately 45 percent. Both rates were more than 30 points lower than the national average. Even 29 years after the Great Hanshin-Awaji Earthquake, which caused many deaths due to the collapse of houses, the current situation has become clear that in some areas, earthquake resistance has not progressed... (Professor Emeritus Nobuo Fukuwa, Nagoya University) "You have all seen that buildings that are insufficient in earthquake resistance collapse one after another. Lives are saved if houses do not collapse, and livelihoods are protected." "We must pool all our strength to make Japanese buildings earthquake-resistant." The earthquake resistance rate of houses in Aichi Prefecture is about 90%. However, there are still 250,000 detached houses that do not meet the earthquake resistance standards. In the wake of the Noto Peninsula earthquake, interest in earthquake resistance construction is increasing. A 40-year-old house in Tenpaku Ward, Nagoya City. There is a large window on the south side to let in sunlight. The owner who requested earthquake resistance construction is a "construction professional" with a first-class architect license. (Takano) "Because the south-facing bay window was wide, there were few walls on the south side facing east and west. (The results of the earthquake resistance assessment) were worse than we thought." Takano's home has many large windows on the south side, but the number of walls is only one-third that of the north side, resulting in the result being "unbalanced." It was pointed out that if a strong tremor hits, the south side, which has fewer walls, may collapse. Earthquake resistance standards are broadly divided into three. The old earthquake resistance standards before 1981, the new earthquake resistance standards before May 2000, and the current earthquake resistance standards after June 2000. Takano's home, which was built in 1984 to the new earthquake resistance standards, does not meet the "standards for balance of wall placement" that were established in June 2000. Meanwhile... (Reporter) "While earthquake resistance construction is progressing, attention is also being paid to devices that control earthquake tremors." New building construction underway in Seto City, Aichi Prefecture. (Staff member) "We'll put four here and there." What's being installed is a residential seismic damper called "MIRAIE." Unlike "earthquake resistance," which strengthens buildings to withstand shaking, seismic damping is a concept that "reduces the shaking itself to protect the building." From CBC TV's "Chanto!" broadcast on March 4, 2024

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