4 ms·

I wonder if they discounted this because it was (as wikipedia lists it) an "intraslab" earthquake. I'm not a seismologist, but that reads to me like it wasn't

by 3JPLW 11y ago

I wonder if they discounted this because it was (as wikipedia lists it) an "intraslab" earthquake. I'm not a seismologist, but that reads to me like it wasn't an earthquake from the fault line directly, but rather a secondary artifact of the subduction zone. I agree this is very misleading, but as they tell it through the historical lens, this earthquake also hadn't happened before they realized there could be earthquakes or that they could be big.

matheweis 11y ago
Wikipedia (sorry), has a nice diagram that shows the different categories; the "crustal" and " deep" earthquakes being different from the subduction zone earthquakes that this article is specifically about: https://en.wikipedia.org/wiki/Cascadia_subduction_zone#/media/File:Cascadia_earthquake_sources.png https://en.wikipedia.org/wiki/Cascadia_subduction_zone#/medi...