NoodlesrTuff1256 t1_j9nidaf wrote on February 23, 2023 at 6:03 AM

Reply to comment by scrambledeggsalad in Magnitude 7.2 earthquake strikes Tajikistan, near border with China by Papppi-56

Wasn't the last really huge one back in like 1700? That's a long time for the pressure to build up. I think that researchers figured out that there had been a monster quake in the Cascadian zone because of old writing from Japan describing a tsunami of mysterious origin. It turned out to have traveled all the way across the Pacific after a quake in the Pacific Northwest region.

kirbygay t1_j9phq1z wrote on February 23, 2023 at 5:25 PM

The local indigenous peoples also had tales of a tsunami sweeping away tons of people.

If anyone is interested, here's a neat article: https://slate.com/technology/2015/09/earthquakes-and-tsunamis-in-the-pacific-northwest-native-american-myths-and-geoscience.html

Kale t1_j9t3mso wrote on February 24, 2023 at 10:50 AM

The Japanese were aware of the link between earthquakes and tsunamis when the last Cascadia event occurred. There are records of a tsunami in Japan without a recorded quake. It's believed this may have been Cascadia (early 1700's I think?). Indigenous people told the first European explorers about quakes, which probably had occurred not long before the explorers reached the PNW coast.