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The Tōhoku Earthquake, Part 2: Fire and Water

March 18, 2011November 13, 2018,
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This post is part of a series called The 2011 Tōhoku Earthquake
Show More Posts
  • A Magnitude 8.9 Earthquake Rocks Tōhoku, Tsunami Devastates Sendai, State of Emergency Declared in Japan
  • Reporting from Tokyo 3 Days After the Earthquake
  • The Tōhoku Earthquake, Part 1: The Anatomy of Failure
  • The Tōhoku Earthquake, Part 2: Fire and Water
  • The Tōhoku Earthquake, Part 3: Fragile Civilization

SENDAI, Japan–An ancient inlet valley surrounded by snowy mountains appears before me at sunset. But the smell of oil and death burns my nose at the same time. An old fisherman approaches me and points in the distance. “You see those three oil tanks out there? Those tanks created all the deaths here. A 10-meter tsunami overcame the seawall, and it destroyed the tanks and spilled oil into the bay. The oil caught on fire, and it became a hell of fire and water.”

The bay turned out to be a source of destruction for this once-vibrant community of Kesen-numa. The tsunami carried the burning oil slick deep into the inlet valley. I remember this once-beautiful place that I bicycled through on hot summer days when I was in high school. That memory is quite a contrast from what I see in front of me—a half-snow-covered, charred mess. A cold wind hisses as it blows through the wreckage and debris.

I see several large ships grounded a couple kilometers from the bay. They were deep-water tuna fishing boats. If these ships came toward you with a burning tsunami, there would be nothing you could do about it. No buildings can withstand such things.

Large ships like this cleaved through vulnerable structures during the tsunami, and were then stranded inland.

Narrow bays or inlets are very dangerous. Their shape increases the height and velocity of a tsunami. The effect is similar to squeezing a garden hose. The oil tanks were located in the most hazardous tsunami area with inadequate seawalls. These oil tanks require much taller seawalls if they cannot be on higher ground. To mitigate tsunami hazards, engineers cannot work alone. Collaboration with planners and architects is critical. It needs to be a holistic approach.

Earlier, I’d investigated downtown Kesen-numa. The downtown commercial district was in one of the many inlets in this town, and it was hit by about a two-story-high wave. I figured this out by observing watermarks on the surviving buildings. All the buildings that remained were reinforced-concrete structures. About 80 percent of the buildings were totally destroyed or taken out to sea by the retreating waves. All the destroyed buildings were made of wood.

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Even in the darkest times, hope emerges.

A small elderly lady caught my sleeve and said to me, “I understand you are an engineer. I want you to see my house.” She showed me her three-story, mixed-usage building on a corner facing the bay. She was using the first floor as a store, the second floor as an office, and the top floor as her residence. She asked me to verify the structural safety of her building. She pointed out the large fishing boat on top of the dock and said, “That ship was pushed up by the tsunami. Fortunately, it didn’t hit my house, but a 10-meter-high wave directly hit the house with its full force.”

I walked through her concrete building, and I did not see any structural damage. I told her that her building was safe to occupy. I could see that she was very relieved, and she cheerfully resumed cleaning up the floor. Her building is a true tsunami-sustainable structure. She was able to continue living in her third-floor residence, which was untouched by the sea. Even when confronted with disasters of this magnitude, we can still be prepared.

Kit Miyamoto
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   The Tōhoku Earthquake, Part 1: The Anatomy of Failure
The Tōhoku Earthquake, Part 3: Fragile Civilization   

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Kit Miyamoto

As CEO of the structural engineering company Miyamoto International, Kit is dedicated to making the world a better place. In Kit's words: our responsibility as engineers is to make buildings safer by sharing what we know around the world. Join his journey to make the world a better, safer place.

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اكتشف فن البناء بالحجر المسطح القديم - تقنية مجربة أثبتت جدارتها في المناطق المعرضة للزلازل. تستخدم هذه الطريقة الذكية الأحجار المسطحة المكدسة، التي يتراوح طولها عادةً بين 15 و40 سم، وسماكتها بين 2 و4 سم، لإنشاء جدران قوية تقاوم قوى الزلازل. بفضل الخلطة الطينية المستخرجة محليًا التي تربط الأحجار في جدران بسماكة تتراوح بين 40 و50 سم، وارتفاع بين 2 و3 أمتار، تُظهر هذه الهياكل قوة التصميم البسيط والمستدام.

ما الذي يميز البناء بالحجر المسطح؟💡
إنه يتفوق باستمرار على البناء التقليدي بالحجر المستدير؛ وعلى الرغم من عدم مناعته من الأضرار، فإن الطبيعة المتشابكة للأحجار المسطحة تمنع الانهيار الكارثي.
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