If you go up the Coos River, you can find indications of a big tsunami by digging in the hillside above the river by sixty to eighty feet. The hillside was drastically eroded and logs were buried well up above the rivers bed. It seems likely that parts of North Bend and Coos Bay were washed over by the wave.
Some of that might be tsunami. But the dead stumps and sand indicate that the coastline dropped in elevation into the ocean. By quite a bit - 10 to 20 feet iirc. Imagine what happens if you take miles of coastline and lower it 20 feet in 10 minutes!
BTW - this news is nothing new. It has been in the geology community for at least 15-20 years. And in the local papers since 2001 when we had the Nisqually eq, and lots of people woke up to the fact of what a large eq can do.
And it WILL happen. Who knows when, but when it does, it will happen in an instant. Be prepared.