Earthquake frequencies

Discussion in 'Off Topic International' started by Jacobe, Apr 19, 2011.

  1. Jacobe

    Jacobe Well-Known Member

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    Below is a graph showing how the number of all magnitude earthquakes has grown over recent years. Although we are primarily concerned with long term trends for larger magnitude earthquakes in this report, it is worth noting the trend as it applies to all earthquakes - whether large or small, over a 30 years period or so from the mid-1970s. However, this trend needs to be understood in relation to the increase in seismographs. Certainly, in the last 25 years, more lower intensity earthquakes have been noticed because of a general increase in the number of seismograph stations across the world and improved global communications. This increase has helped seismological centres to locate many small earthquakes which were undetected in earlier decades. Therefore, an upward trend is not unexpected in the graph, although the rise in the number of large earthquakes will be of more significance to our assessment of the trend. By limiting the range of earthquakes being counted in this report to magnitude 7 or above, it means these earthquakes can easily be identified by a limited number of seismographs, and we have ensured that any increase in frequency for these larger earthquakes cannot be down to the increase in overall detection rates in this 25-year period, as all these larger earthquakes are able to be easily detected with fewer seismograph stations.


    [​IMG]

    We had 2.7 richter few months ago, the last that magnitude shivering happened here at late 1800'ties...

    PS. Here's a earthquake simulator for happy LA'ers for the upcoming San Andreas faults quake.

    all this is from http://www.earth.webecs.co.uk/
     
  2. hezey

    hezey Well-Known Member

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    33 years.
    Geological age?

    This from the guy who doesn't know the difference between climate and weather.
     
  3. Red Ant

    Red Ant Well-Known Member

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    Why do you care? What's the ETA on Nibiru?
     
  4. Jacobe

    Jacobe Well-Known Member

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    wtg and ty for your great replies :)
     
  5. mumble

    mumble Well-Known Member

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  6. Jacobe

    Jacobe Well-Known Member

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  7. -al---

    -al--- Well-Known Member

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    stop feeding the troll guys :)
     
  8. mumble

    mumble Well-Known Member

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    But it's fun to have a pet troll (Jacobe)! It keeps my imagination going to read all his bullshit theories about how god is going to bitch slap half the world's population off the face of the Earth with a rock from space. :D
     
  9. -ALW-

    -ALW- Well-Known Member

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    I'll make a big jump out here and just say....there are "weapons" out there that the US Government has. Not going to hold back anymore.

    http://en.wikipedia.org/wiki/Mechanical_resonance

    So, re-think some things.
    The reasons. (oil/money/power/population reduction/real estate)
    Haiti
    Japan
    Iran
    Sri Lanka
     
    Last edited: May 2, 2011