Mexico hit by magnitude 7.6 quake (updated)

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14 Responses to “Mexico hit by magnitude 7.6 quake (updated)”

  1. Gen Knoxx says:

    yo – i tweeted this info already – no need to panic – I read earlier today Malia Obama is in Oaxaca for spring break – ok, now panic

  2. MattVolk says:

    Oaxaca is 100 miles from the epicenter of the quake. Hope those kids are all ok.

  3. Teller says:

    Bet those gals are in Huatulco. If they ain’t, they ought to be.

  4. niktemadur says:

    Two things:
    1. The height above sea level amplifies a quake’s effect, Mexico City is at 7,900 feet.  Where is the magnitude registered, at the city or at the source?
    2. Compounding the situation, under Mexico City is the ancient lake of Texcoco, so that the ground behaves like jell-o during a tremor, scary stuff.

    • iCowboy says:

      Magnitude is the strength of the tremor at the epicentre – the point on the surface directly above the focus where the earthquake actually happened. It is calculated from the effect of the shockwaves on nearby seismographs and is always subject to revision as new data is received. This one has been downgraded from a 7.9 to 7.6 which is a fourfold decrease in energy. On average there are between 10-20 of these every year around the world.

      Altitude has no effect on earthquake effects. The depth of the focus of the ‘quake – does – generally, shallow earthquakes have more effect as they deliver more energy per square metre of the surface than a comparable earthquake at greater depth.

      You’re right about tremors being amplified by soil and infill such as that under Mexico City and Kobe.

  5. dagfooyo says:

    My gf and I are vacationing in Mexico City.  We were on our way back towards town from Hidalgo when the quake hit, barely felt it where we were.  I’m happy to report that Mexico City as a whole seems fine, some of the traffic lights went out causing traffic jams, and some small rubble hit the sidewalks but by and large everything seems to be functioning as normal.

  6. frozenintime says:

    Beautiful Oaxaca, the peaceful village of Pluma Hidalgo and the wonderful coffee of the hill country.

  7. Dette Marhez says:

    Coincidently, there was an earthquake drill around the time of the earthquake in Chiapas.

    http://hazmeelchingadofavor.com/2012/03/20/epic-win-simulacro-de-sismo/

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