What's really surprising to me is that right below Chicxulub in intensity on that list are the recent Indian Ocean earthquake in 2004 and the one in Japan in 20

What's really surprising to me is that right below Chicxulub in intensity on that list are the recent Indian Ocean earthquake in 2004 and the one in Japan in 2011. They're both only about 1/10th the total energy, but still it's a lot more than I would have guessed. (I live in the vicinity of the Cascadia subduction zone, which will probably experience something similar some time in the next couple hundred years.)