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Multifault earthquake threat for Seattle region revealed by mass tree mortality

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Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#41
post #36
post #30

Earlier quoted context omitted.

On the other hand, Seattle is one of the best places in the world to ride out climate change, which is 100% happening, and happening already. It’s all a numbers game.

And SF isn't?

I'm no expert on the region but aren't people in California forever whining about heat waves and water shortages?

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#44
post #4

Bizarre...I just watched this video this evening. "Great Earthquakes of the Pacific Northwest" https://www.youtube.com/watch?v=UJ7Qc3bsxjI

On the contrary, that video probably surfaced for you precisely because this study is making the rounds. More people than usual are probably searching for and watching stuff about Seattle seismology. As it turns out, the algorithm does not work in such mysterious ways.

One day I got to work early before anyone else was there and I was daydreaming pondering earthquake scenarios and what I would do if one happened (I was on an upper floor).

It wasn't until hours later when I checked the news and heard conversations around the office that I realized I had felt an earthquake and just didn't realize it. It had never even occurred to me

I think living in a city I'm just accustomed to a car driving by in a parking garage and various other rumblings so I never considered that's what it was. Later in retrospect, I recognized that being on the 7th floor of a concrete building, nowhere near a parking garage or construction, that was the only explanation.

The most memorable part of the experience was realizing that my unconscious brain recognized it long before I processed it consciously.

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#45
post #41
post #36

Earlier quoted context omitted.

And SF isn't?

I'm no expert on the region but aren't people in California forever whining about heat waves and water shortages?

Water shortages are largely in the central valley and Southern California.

Sf gets its water from Hetch Hetche, clean hydro power too.

SF is a very different place in a lot of ways from the rest of California, and the US in general.

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#46

Cascadia Subduction Zone[1] is why I never considered living in Seattle/Portland once I found out about it. Funny, cause I live in the SF Bay Area, where the earthquakes are frequent, but they can never reach the magnitude of what's possible by the Cascadia Subduction Zone. [1] https://en.wikipedia.org/wiki/Cascadia_subduction_zone

The Cascadia quake will be about same damage to Seattle and Portland as Bay Area quake. It could be up to magnitude 9 but the fault is 60 mi away from the cities. The big difference is that it will affect the whole area. And that PNW is way behind in infrastructure.

According to https://www.sfchronicle.com/projects/2023/bay-area-earthquak... vs https://www.newyorker.com/magazine/2015/07/20/the-really-big... you're looking at two orders of magnitude difference in terms of the estimate of people affected. I'm not sure what led to the difference but that's striking.

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#47

Cascadia Subduction Zone[1] is why I never considered living in Seattle/Portland once I found out about it. Funny, cause I live in the SF Bay Area, where the earthquakes are frequent, but they can never reach the magnitude of what's possible by the Cascadia Subduction Zone. [1] https://en.wikipedia.org/wiki/Cascadia_subduction_zone

The fault is at least 150 miles from Seattle proper, the city will not receive the full brunt of the earthquake. Tsunamis are strongly mitigated by the geography of Puget Sound — the biggest tsunami threat is actually the Seattle fault.

By contrast, the San Andreas fault literally runs through the middle of the Bay Area.

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#48
post #30

Cascadia Subduction Zone[1] is why I never considered living in Seattle/Portland once I found out about it. Funny, cause I live in the SF Bay Area, where the earthquakes are frequent, but they can never reach the magnitude of what's possible by the Cascadia Subduction Zone. [1] https://en.wikipedia.org/wiki/Cascadia_subduction_zone

On the other hand, Seattle is one of the best places in the world to ride out climate change, which is 100% happening, and happening already. It’s all a numbers game.

[deleted]

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#49

Earlier quoted context omitted.

The Cascadia quake will be about same damage to Seattle and Portland as Bay Area quake. It could be up to magnitude 9 but the fault is 60 mi away from the cities. The big difference is that it will affect the whole area. And that PNW is way behind in infrastructure.

According to https://www.sfchronicle.com/projects/2023/bay-area-earthquak... vs https://www.newyorker.com/magazine/2015/07/20/the-really-big... you're looking at two orders of magnitude difference in terms of the estimate of people affected. I'm not sure what led to the difference but that's striking.

That New Yorker article goes viral every few years - it's a well written piece and spins a great yarn, but there's some significant hyperbole and it's sources don't quite back up the claims. Yes, a 9.x will be devastating. No, everything west of i-5 will not be toast.

Re: Multifault earthquake threat for Seattle region revealed by mass tree mortality

#50
post #30

Earlier quoted context omitted.

On the other hand, Seattle is one of the best places in the world to ride out climate change, which is 100% happening, and happening already. It’s all a numbers game.

Do you have a source for this? What is "best" in this context?

Freshwater availability is a big factor that swings in the PNW's favor.
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