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MadMonk

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MadMonk last won the day on August 26 2014

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  1. For those who are wondering why there's a discrepancy between JMA and USGS reports http://earthquake.usgs.gov/learn/faq/?faqID=22 Basically you are inferring the scale by measurements at locations that are not right at the epicentre, and the estimated magnitude will depend on what assumptions you make about how seismic waves propagate. JMA and USGS may very well have different models In addition, there are always error bars associated with any estimations, so as long as the error bars overlap for the JMA and USGS estimation it is not really a discrepancy.
  2. I've been to Tokyo several times and the pollution is not bad at all. I believe they wear masks whenever they are sick to prevent the spread of the germs.
  3. The fact that it is classified as a comet that entails it is a small piece of rock. Given the effort the astronomers put into classifying whether pluto is a planet or not, it is unlikely that the comet is not in fact a comet. It is even more unlikely that it is a brown dwarf since a brown dwarf has a mass that is at least 10 times the mass of the jupiter, and have the same size as jupiter. In addition, I think the magnitude of the force is irrelevant since what matters to an earthquake is that the forces acting each side of the tectonic plate is different. At that distance the difference will be even more minute. That's the same reason why 'supermoon' cannot possibly be an explanation either. The change in the gravity is already minute, and the change in the difference between the two plates will be even more so. To further put the numbers 400N to 40,000N into perspective, consider the amount of forces involved in a fault: according to http://www.whoi.edu/science/GG/people/jlin/papers/Freed&Lin-Geology-2002.pdf the pressure buildup over the San Andreas fault over a 10 year period is 2-3 bars, which is 200,000 Pa, that is 200,000 N per square meter of the fault. For a fault that is 100km wide and 10km deep, that's about 10^14 N.
  4. By definition a comet is made out of rock and ice.
  5. The force exerted on the earth by the comet is minuscule. From what I gather, it is currently about 2AU, or about 3x10^11meters away from earth. I can't find the mass of of the specific comet, but I've seen numbers from 10^11 kg to 10^14 (halley's comet) from google. Plugging into Newton's law of gravity F=G M1 M2/r^2, with G = 6 x 10^-11, mass of earth 6x10^24, the force of comet on earth=400N to 400,000N For comparison an average male of 80kg exerts about 800N on the earth.
  6. Thanks again :) +2

  7. Thanks for the profile view. :)

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