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Jan 7, 2024 · Scenes of buildings reduced to rubble were beamed around the world this week following a 7.5 magnitude earthquake that struck Ishikawa prefecture on Japan’s western coast on Monday. The full ...
Aug 30, 2023 · Since 1960, Japan has marked September 1 as national Disaster Prevention Day. Every year on that day, countless schoolchildren, employees and civil servants—including the entire government—carry out simulation exercises in preparation for a major earthquake. In Japan, many people stock emergency supplies at home, as do businesses and local ...
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So I finally got a PC built after moving to Japan a year ago. Now I have a dilemma. Australia doesn't suffer earthquakes, and Japan has a lot of them. I'm wondering - should I keep my beauty sitting on the desk, or should I put it down on the ground? Hardwood floors so not too concerned about dust.
- Overview
- Adapting to major earthquakes
- Designing for shaking
The country has earned a reputation as one of the most disaster-ready nations in the world due to its seismic codes and culture of preparedness, much of which was built on knowledge from previous disasters.
The Tokyo Skytree, one of the capital city's most recognizable skyscrapers, has been built to withstand even major earthquakes.
Three days after a major earthquake shook the West Coast of Japan, a difficult search for survivors is still underway. The magnitude-7.6 earthquake off the coast of the Noto Peninsula produced the strongest shaking the region had experienced in decades, triggering a tsunami evacuation order for nearly 100,000 people. While the damage assessments are still trickling in, early reports estimate hundreds of houses were destroyed by the quake and subsequent fires, and more than 80 deaths have been confirmed so far.
But seismologist Lucy Jones believes the intensity and offshore location of this earthquake could have produced significantly more devastation had the nation been less prepared. On X, Jones praised Japan’s “strong, enforced building codes,” which she says resulted in the damage being “much less than it could have been.”
Understanding how to best prepare for major earthquakes is often hard-won, stemming from knowledge gleaned from past disasters, says Keith Porter, chief engineer for Canada’s Institute for Catastrophic Loss Reduction. In Japan, seismic regulations for building codes were first introduced after a magnitude-7.9 earthquake in 1923 killed more than 140,000 people and reduced hundreds of thousands of structures to rubble. These early regulations were focused on strengthening new structures being built in urban areas, adding oversight to the construction of wood and concrete buildings.
The seismic code has undergone a number of significant changes in the decades since, most notably through the Building Standard Law of 1950 and the New Earthquake Resistant Building Standards Amendment in 1981. Along with providing construction specifics, these pieces of legislation established expectations for how buildings are expected to perform during earthquakes. The 1950 Act established a standard in which buildings were expected to withstand earthquakes up to a magnitude-7 without serious issue. The 1981 Amendment gets a bit more specific with what that damage can be, stating that when earthquakes up to a magnitude-7 strike, a building should only sustain minor damage but still function as usual. For stronger earthquakes, Japanese law says the building should simply not collapse.
There are a number of different techniques that achieve these standards in Japan, with the choice of which to use often depending on the type of structure—such as a skyscraper or single-family home—and the budget available, along with other considerations. At a base level, buildings are fortified with thicker beams, pillars, and walls to better withstand shaking.
There are also techniques to help separate buildings from the movement of a shaking ground. One popular method is installing pads made of absorbent material like rubber at the base of a building’s foundation, dampening the shock of movement to the structure itself. Another approach, the base isolation system, calls for not just having these pads at the base, but building the entire structure atop thick padding so that there is a full layer of separation between the unit and the moving earth.
Porter notes that many older Japanese buildings are traditional post and beam wood frame construction, which “tends to be very fragile” and vulnerable to earthquake damage. Following another deadly earthquake in 1995, Japan began focusing on retrofitting older architecture to be more resilient to earthquakes.
Of course, none of this is foolproof. Specific challenges arise depending on the location of a building, such as if it is in a liquefaction zone, in which the ground can no longer support the weight of structures. And then there are the secondary consequences that often follow major earthquakes, such as fires igniting or tsunami damage.
That’s why building safety is just one part of Japan’s approach to earthquake resiliency.
Following the New Year’s Day earthquake, University of Tokyo professor Toshitaka Katada told the Associated Press he believes there are “probably no people on Earth who are as disaster-ready as the Japanese” given the preparedness measures that are considered routine in the country, like evacuation planning and drills. Evacuation centers, often schools or other community gathering spaces, are equipped with emergency supplies, and residents are told to have emergency supplies available at their homes, as well. The country also has a robust warning system, which was triggered for both this week’s earthquake and tsunami threat.
Jan 9, 2024 · These changes first began a century ago, when a 7.9-magnitude earthquake in Yokohama, Japan, killed 140,000 people and toppled hundreds of thousands of structures in 1923.
- Elizabeth Fazzare
Jan 5, 2024 · The magnitude-7.6 earthquake off the coast of the Noto Peninsula produced the strongest shaking the region had experienced in decades, triggering a tsunami evacuation order for nearly 100,000 people. While the damage assessments are still trickling in, early reports estimate hundreds of houses were destroyed by the quake and subsequent fires ...
Jun 3, 2019 · Many new buildings in Japan are not base isolated, but even conventional ones are generally stronger and stiffer than American ones, according to Mr. Hamburger, the code expert, and other ...
