Pete -- a former Oregonian (Mt. Hood) whose favorite vacation destination was Cannon Beach, Oregon, the Cascadia Subduction Zone - a relatively recent discovery - fascinates me.
The Oregon coast was my family's frequent vacation spot in the 1970s-80s and I went to school (Oregon State) an hour away from Newport. Have spent countless hours/ days/ weeks strolling and laying on those beaches -- oblivious, as were most scientists, to any lurking geologic threat. If I had felt a tremor or even a significant quake motion while on the beach, it would not have occurred to me that a tsunami could be forthcoming. I had my last long vacation there in the early-2000s and still had no awareness of the threat -- while relishing my ocean-front suite on the ground floor.
Since the Indonesia tsunami disaster of 2004 and Japan's devastating tsunami in 2011, the parallels to the CSZ have received a great deal more attention in the Pacific Northwest, and elsewhere. If I were on that beach today I would be keenly mindful that any tremor requires an immediate response to head for the hills as fast as possible. I think many people -- at least residents of the Pacific Northwest -- are mindful of the threat these days. And they have tsunami signage now. Still, anyone would be frozen in place for seconds if not minutes while their brain processes what's happening.
And I worry that 15 minutes is not enough time to gain much elevation. Cannon Beach is a very big expanse of sand. Hopefully people could have closer to 30 minutes from the shaking to the tsunami. The feeble and unfit would be doomed without assistance. Reminds me of a woman who sloooowly waddled into Costco in front of me this week -- she'd need a Humvee to get from the beach to the hill in 15 minutes.
The worst scenario -- 9.0 quake that would last several minutes -- is impossible to fathom. Much of the coast could be cut off from inland -- there are so many vulnerable bridges and not many roads east. The relief efforts would have to eclipse anything we've seen in this country before.
Hope it never happens, but there is certainty now that it is only a question of when.
Cannon Bean on Google Map:
https://goo.gl/maps/HRTznWhenever my sister goes to the coast these days, I do my best mom imitation and remind her of the tsunami threat. Thanks to ETS, she has a small survival kit in her car that I put together for her a few years ago.
I just looked at that map again. We used to walk that beach for miles, day and night. Nowadays I'd be wearing at least a small backpack on that walk....
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