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  1. #1
    Roll Out Jeremy
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    Ollie Ollie Oxen Free
    "Don't believe everything you think"

  2. #2
    Frog Whisperer
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    so does a negative magnitude earthquake cancel out the positive?
    Of course I'm sure...that doesn't mean I'm right......

  3. #3
    Mehpic
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    negative magnitude. learn something new every day....
    catzilla: I wish we were all a little more invincible.

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  4. #4
    corning my own beef
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    WTF is a negative magnitude quake?? Are the tectonic plates being really, R-E-A-L-L-Y still?
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  5. #5
    Mehpic
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    ...and for the lazy....

    Back in the day (1930s), magnitudes started as simply the logarithm of the amplitude of the largest oscillations written on a specific seismograph at CalTech (a Wood-Anderson torsion seismograph measuring horizontal motion, if you must know!). The instrument Charles Richter used was the standard. Really for no other reason than that he had it and so he used it. He used the logarithm of the amplitude because there was such a large range of amplitudes that the compression of scale you get from taking logs made things easier to plot. Some darned earthquake that was 100 km away, made a trace with a peak displacement of 1 mm on his seismograph and he called that the standard earthquake--magnitude 1. An earthquake at the same distance that made a displacement of 10 mm was a magnitude 2, 100 mm was magnitude 3, and so on. "Smaller" earthquakes closer to the lab or "larger" earthquakes more distant might produce the same peak amplitude, so the formula includes a distance correction for earthquakes not at the standard distance. This explains an enduring mystery to many folks--negative magnitudes. An earthquake that wrote a record with a peak displacement of 0.1 mm would be a magnitude 0, right? And if that earthquake were fartther away than 100 km, well ... it would have a negative magnitude. Remember: Magnitudes are a relative size estimate. Nothing absolute about them (but, perhaps, Charlie Richter's arbitrary "standard" earthquake and seismograph); no physical units ascribed to them.
    catzilla: I wish we were all a little more invincible.

    The NEGU Foundation: Caring for Courageous Kids http://www.thenegufoundation.org/

  6. #6
    Roll Out Jeremy
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    Quote Originally Posted by Touch0Gray View Post
    so does a negative magnitude earthquake cancel out the positive?
    I don't know, I didn't feel it....
    Ollie Ollie Oxen Free
    "Don't believe everything you think"

  7. #7
    .je
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    So it's not like a regular earthquake, except it's 180 degrees out of phase?

  8. #8
    hfc
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    Negative earthquake everything is really, really chill man.

  9. #9
    Frog Whisperer
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    Quote Originally Posted by Fordy View Post
    I don't know, I didn't feel it....
    not only didn't YOU feel it but it took some of the other feeling away!
    Of course I'm sure...that doesn't mean I'm right......

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