What the heck is a gust front?

Here’s the result of a query I threw at the USGS National Earthquake Information Center database, showing all earthquakes stronger than 5.0 for the year so far in the region.

Mother Nature is really toying with Japan right now. I’m not sure how much press the recent Japanese earthquakes have gotten in the states, but they’re pretty big news here. First of all, last month’s huge earthquake: When I woke up on Saturday the 14th and turned on the TV while eating breakfast, it was on every channel. The earthquake was a magnitude 7.2, and totally reshaped the landscape in some areas. The eastern and western tectonic plates that meet at the earthquake fault line moved toward each other up to 28cm and 29cm respectively in some places. Because of the specific planting grid pattern layout of rice fields, it’s easy to see where they buckled and formed small hills where the ground pushed together.

A number of roads were not just destroyed, but erased- the land they were on is now gone. One landslide moved 5 million cubic meters of soil – enough earth to fill the Tokyo Dome 40 times over (as repetitively reported by a number of news agencies here). Some landslides left gaping holes in the ground that look like the Grand Canyon. Fifteen “quake lakes” formed from landslides blocking rivers. The power involved is really awesome, in the more traditional sense of the word.

One local onsen was completely erased by the earthquake. The family that owned it and a few patrons were inside when the building was crushed and carried downhill in a landslide. So the building is gone, the owners and their family are gone, and the spring is now buried under a mountain of mud.

Everyone interviewed says that they couldn’t remain standing during the quake, they had to lay down or fall down. Videos from security cameras show everything in stores just collapsing and falling to the ground. Twelve people died, ten are missing (now presumed dead), and 358 injured.

Some bridges collapsed, and land under some national highways has risen by up to 50cm, disjoining sections of roads and bridges. A number of bridges that weren’t destroyed will need to be replaced because of damaged underpinnings. It seems a lot like a Sim City earthquake, with long ripples in the topsoil, and everything above the quake just wiped- trees, roads, and buildings alike.

So that was June 14th. A week ago, on July 22nd, there was a 5.2 off the coast, and then the next day, a 6.8 on eastern Honshu (the largest Japanese island) on the 23rd injured 200 people and damaged 90 buildings.

As if a series of powerful earthquakes wasn’t enough, a few days ago there were wind gusts strong enough to uproot trees, knock over light buildings (temporary offices, sheds, unfinished construction), and injure people with flying debris. A huge deluge today dumped so much rain that four people died in flash flooding, and the government evacuated 50,000 people from central Japan. One river rose 1.3 meters (~4 feet) just in the span of ten minutes. They didn’t even have time to close some flood control gates it was so fast.

I know I haven’t been here very long, but I can’t imagine this is normal. It can’t be.

Right??

Comments

5 responses to “What the heck is a gust front?”

  1. gNat Avatar
    gNat

    Godzilla is awakening!

  2. Shannon Avatar

    First law of living abroad– The Media would never cover something so newsworthy. I recall hearing about the earthquake on July 14th but had no idea of its damage. Wow.

  3. carolyn Avatar
    carolyn

    wow…. just be careful!

  4. Shannon Wood Avatar
    Shannon Wood

    I don’t know about “normal” but when I was a kid we had earthquake drills like we have fire drills here in the states. A few of them were real. Definite drawback to living there ;-/. Fortunately a lot of technology has gone into building up Japan to be as quake-proof as possible. Still systems aren’t perfect…

  5. David Avatar

    gNat:
    I thought I saw a preview for a new Godzilla movie last week, but I couldn’t understand what they were advertising. It may have been a shopping mall for all I know (“Monstrous Savings!”).

    Shannon:
    Do you mean the American media wouldn’t cover something so newsworthy that happened in another country, or that the evening news (in any country) wouldn’t cover something that people actually wanted to know? If (A), then yes, you’re totally right. We wouldn’t want to start educating the populace on topical world news now, would we? I think (B) is right too, but perhaps to a lesser extent.
    Yeah, it still gets occasionally mentioned in the news when a story is in any way related to the worst-hit areas.

    carolyn:
    Thanks. I remember my earthquake drills from elementary school, so I should be fine, right?

    Shannon Wood:
    Yeah, no joke. They mention earthquakes pretty frequently here. Quite warranted, apparently. I asked Ms. Semba about the natural phenomena happening this summer, and she said this is really extreme. I’m not sure if that makes me feel better or worse.

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