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So This calc is accepted for whitebeard, except there are many things wrong with the calc. Least of the problems is that for the speed values for level 7 earthquake, instead of using the values of 20 - 41.4 cm/s, and converting that into 0.2 - 0.414 m/s, they just take the g values and just directly convert it to m/s.
The next problem is that they get a wrong range of speed for a level 7 earthquake. They use this wikipedia article. However, the values in this wikipedia article seem incorrect. That same article lists this article as their source, which lists the correct ranges for a level 7 earthquake at 16 - 31 cm/s, a very large difference.
The average they get of 30.7 cm/s is also wrong. This is what the typical speed for a level 7 earthquake should be. The wikipedia article they use links to another wikipedia article that uses that as their source. The average PGV of a level 7 should be 20 cm/s, or 0.2 m/s.
I believe this is consistent because the article itself describes the chart with, “The estimated intensity map is usually wholly or partially derived from ground motions recorded by seismic instruments, and represents intensities that are likely to have been associated with the recorded ground motions”, and that “they are consistent on average with intensities at these ranges of ground motions recorded in a number of past earthquakes”
Using these values the calc should look something like
1/2 * 2.9881781e30 * 0.2^2 = 5.9763562e+28 joules
Agree:
Disagree:
Neutral:
The next problem is that they get a wrong range of speed for a level 7 earthquake. They use this wikipedia article. However, the values in this wikipedia article seem incorrect. That same article lists this article as their source, which lists the correct ranges for a level 7 earthquake at 16 - 31 cm/s, a very large difference.
The average they get of 30.7 cm/s is also wrong. This is what the typical speed for a level 7 earthquake should be. The wikipedia article they use links to another wikipedia article that uses that as their source. The average PGV of a level 7 should be 20 cm/s, or 0.2 m/s.
I believe this is consistent because the article itself describes the chart with, “The estimated intensity map is usually wholly or partially derived from ground motions recorded by seismic instruments, and represents intensities that are likely to have been associated with the recorded ground motions”, and that “they are consistent on average with intensities at these ranges of ground motions recorded in a number of past earthquakes”
Using these values the calc should look something like
1/2 * 2.9881781e30 * 0.2^2 = 5.9763562e+28 joules
Agree:
Disagree:
Neutral:
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