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General Chat Thread, Fukushima Nuclear Power Plant in General; The distance of the quake from the plants is a key factor in this: Japan may experience these quakes on ...
  1. #76


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    The distance of the quake from the plants is a key factor in this: Japan may experience these quakes on a regular basis, but what was so devastating was it's close proximity to the east coast. It was very close to the surface, it was very powerful, and it was very close to the land. The science behind seismic activities is complex to say the least. Distance and depth have a marked affect on the effects felt.

    If you looked at the data of earthquake power AS FELT BY THE LOCATION of the power plants, I daresay it would generally withstand the blast; the chances of an earthquake of that magnitude hitting at that exact location is nowhere near as likely, and as already pointed out, they pulled a scotty; they said it will stand up to a 7.9, and it took the beating of an 8.9/9.0

    Also to note, the ricter scale increases by a factor of 10 per single point; so a 8.9 is 10 times more powerful than a 7.9, and 100 times more powerful than a 6.9. So when you consider it's taken a beating 10 times more powerful than it was designed for, that's pretty damned good going.

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    tommej's Avatar
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    Quote Originally Posted by sonofsanta View Post
    Actually... 8.9 is just 10 times stronger than 7.9. Logarithmic scale and all that.
    Not quite.

    Each step on the moment magnitude scale is 101.5 times the last. So from 7 to 8.9 = 10(1.5 x 1.9) = 102.85 = 707
    Last edited by tommej; 16th March 2011 at 02:56 PM.

  3. #78

    localzuk's Avatar
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    Quote Originally Posted by sonofsanta View Post
    Actually... 8.9 is just 10 times stronger than 7.9. Logarithmic scale and all that.
    An 8.0 is the equivalent of around 63.1 PJ of energy (63.1 x 10 to the 15 Joules). A 9.0 is the equivalent of a 2.00 EJ (2 x 10 to the 18 Joules). So, not 10 times stronger...

    I suppose it depends on what you class as 'times stronger'. To me, 63.1x10 to the 15 Joules is not 10 x less than 2.0x10 to the 18 Joules.
    Last edited by localzuk; 16th March 2011 at 03:11 PM.

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    Richter magnitude scale - Wikipedia, the free encyclopedia

    The Richter magnitude scale, also known as the local magnitude (ML) scale, assigns a single number to quantify the amount of seismic energy released by an earthquake. It is a base-10 logarithmic scale obtained by calculating the logarithm of the combined horizontal amplitude (shaking amplitude) of the largest displacement from zero on a particular type of seismometer (Wood–Anderson torsion). For example, an earthquake that measures 5.0 on the Richter scale has a shaking amplitude 10 times larger than one that measures 4.0. The effective upper limit of measurement for local magnitude ML is just below 9 for local magnitudes and just below 10 for moment magnitude when applied to large earthquakes.[1]

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    Gonk's Avatar
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    The Register's Wednesday Update in the Fukushima Nuclear Power Plant: Fukushima situation as of Wednesday ? The Register

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    CHR1S's Avatar
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    Quote Originally Posted by penfold_99 View Post

    A better way to produce electricity from nuclear technology would be to use thorium 228, it only produces a fraction of the waste but the waste only has a half life of 2 year (afaik).
    Wikki says - 1.9116 years the decays into 224Ra with a half life of 3.64 days.

    That's assuming that thorium 228 is the material used to create Uranium-232 in the thorium cycle, Uranium-232 has a half life of 69 years.

    /not a nuuuuclear tech, so this is assumption from a wikki article

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    tommej's Avatar
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    Since when has wikipedia been a reliable source?

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    localzuk's Avatar
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    Quote Originally Posted by tommej View Post
    Since when has wikipedia been a reliable source?
    Since it is as reliable as the Encyclopaedia Britannica...

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    aerospacemango's Avatar
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    Quote Originally Posted by tommej View Post
    Since when has wikipedia been a reliable source?
    You mean it's not????

    OMG! I'm in shock!

    And I thought WIKI was the font of ALL knowledge!

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    Quote Originally Posted by tommej View Post
    Since when has wikipedia been a reliable source?
    OK then.....

    How Are Earthquake Magnitudes Measured?
    The Richter magnitudes are based on a logarithmic scale (base 10). What this means is that for each whole number you go up on the Richter scale, the amplitude of the ground motion recorded by a seismograph goes up ten times. Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude 4 earthquake (and 32 times as much energy would be released).
    The Richter Magnitude Scale
    On the Richter Scale, magnitude is expressed in whole numbers and decimal fractions. For example, a magnitude 5.3 might be computed for a moderate earthquake, and a strong earthquake might be rated as magnitude 6.3. Because of the logarithmic basis of the scale, each whole number increase in magnitude represents a tenfold increase in measured amplitude; as an estimate of energy, each whole number step in the magnitude scale corresponds to the release of about 31 times more energy than the amount associated with the preceding whole number value.
    Richter scale (seismology) -- Britannica Online Encyclopedia
    Each increase of one unit on the scale represents a 10-fold increase in the magnitude of an earthquake—in other words, numbers on the Richter scale are proportional to the common (base 10) logarithms of maximum wave amplitudes. In theory the scale has no upper limit, but in practice no earthquake has ever been registered above magnitude 9.

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    Quote Originally Posted by aerospacemango View Post
    And I thought WIKI was the font of ALL knowledge!
    It doesn't even have the words "DON'T PANIC" on the front in big friendly letters.

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    I stand corrected , was refering to the moment magnitude scale though.

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    Ok, so the Richter scale works by amount of ground shaking, whereas I was working with energy involved.

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    Quote Originally Posted by localzuk View Post
    Ok, so the Richter scale works by amount of ground shaking, whereas I was working with energy involved.
    Damnable Science and its constant need for units and what-have-you to be stated!

    In all honesty, I only even know about the Richter scale anyway. This may actually be one of those few shining moments where we were both right. In which case, it was me being a pedant so I lose on moral grounds.

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    Quote Originally Posted by sonofsanta View Post
    Damnable Science and its constant need for units and what-have-you to be stated!

    In all honesty, I only even know about the Richter scale anyway. This may actually be one of those few shining moments where we were both right. In which case, it was me being a pedant so I lose on moral grounds.
    Huzzah! I'm the Charlie Sheen of this conversation - winning! Now where's that tiger blood?

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