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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

#31

Post by finite_depth »

xattt wrote: post #15
dataflow wrote: post #13

Earlier quoted context omitted.

> 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. What makes you think a big one ("The Big One") isn't going to hit the Bay Area?

I’m wondering how far the big one will be felt. As egocentric as my question is, will I feel it on the East coast?

No, but you would feel it well inland throughout the Mountain West. See this simulated USGS map for a 9.0 quake: https://upload.wikimedia.org/wikipedia/commons/8/80/9.0_Casc... - for scale, the light blues are about the edge of where you'd clearly go "oh, yep, that's an earthquake", although you might notice such a large one at lower ground acceleration because the shaking would be quite prolonged (~minutes, rather than the ~10-20 seconds of a typical minor quake).

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

#32

Post by dmitrysergeyev »

There’s a nice government’s map that demonstrates potential impact of the various quake scenarios in Seattle: https://experience.arcgis.com/experience/2acb05d732134331bc0...

An interesting observation is that Cascadia Subduction Zone is potentially less devastating than Seattle Fault despite being capable of a 100x bigger magnitude (9+ vs 7.2) thanks to a longer distance from the city

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

#33

Post by pests »

vidanay wrote: post #12
codetrotter wrote: post #10

Earlier quoted context omitted.

> the topic is "trending" In which case they might suggest it to you as well, even if your personal interests are not closely related to whatever happens to be trending?

It wasn't suggested to me. I am working my way through his lectures and I explicitly went to the channel and selected the video.

The next logical question is what set you off to work your way through his lectures? Was whatever caused that, inspired by this?

I don't think it matters or anything but it is an interesting question into virality and where ideas come from.

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

#34

Post by cc101 »

I can't seem to load this article, but I would like to offer this: I have long thought that the major effect of natural disasters is not the disaster itself, but the social unrest cause by the government not being able to cope. A super quake would be bad enough, but social unrest would make it much worse.

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

#35

Post by molsongolden »

Exuma wrote: post #25
mhb wrote: post #14

https://www.newyorker.com/magazine/2015/07/20/the-really-big...

This article actually is loaded with inaccuracies. I once called the local earthquake office where I live, where the local scientists and such work. They said this article is the bane of their existence because of people calling into their office with false beliefs that have just propagated into fear over time. I dont even think the sentence got out of my mouth "so about that article I saw...", I was calling to see i…

Is there a better resource?

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

#36

Post by Axsuul »

ksenzee wrote: post #30
imbusy111 wrote: post #8

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.

And SF isn't?

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

#37

Post by codetrotter »

vidanay wrote: post #12
codetrotter wrote: post #10

Earlier quoted context omitted.

> the topic is "trending" In which case they might suggest it to you as well, even if your personal interests are not closely related to whatever happens to be trending?

It wasn't suggested to me. I am working my way through his lectures and I explicitly went to the channel and selected the video.

My bad. I misunderstood what you meant.

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

#38

Post by elliotec »

ksenzee wrote: post #30
imbusy111 wrote: post #8

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.

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

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

#39

Post by vidanay »

pests wrote: post #33
vidanay wrote: post #12

Earlier quoted context omitted.

It wasn't suggested to me. I am working my way through his lectures and I explicitly went to the channel and selected the video.

The next logical question is what set you off to work your way through his lectures? Was whatever caused that, inspired by this? I don't think it matters or anything but it is an interesting question into virality and where ideas come from.

Well, that's a long a twisty route...

I was originally watching videos from a guy who goes hiking further north in BC. From there, I searched for similar videos in WA. From there I saw a couple of videos about the modern history (1800's to today) and settlement of Seattle and the sound. From there I saw one of Nick Z's geology videos which I really liked and have been watching them since.

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

#40

Post by Stratoscope »

imbusy111 wrote: post #8

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

My mom was a Red Cross nurse who worked in the relief effort after the 1964 Good Friday earthquake and tsunami that devastated Anchorage and areas as far south as Crescent City, California.

It was magnitude 9.2, the second largest in recorded history.

The photos she brought back were quite something. I may still have them somewhere, but in the meantime there are plenty online. LIFE.com has a remarkable collection:

https://www.life.com/history/the-great-alaska-earthquake-of-...

https://ready.alaska.gov/_64Quake/History

https://earthquake.usgs.gov/earthquakes/events/alaska1964/

https://en.wikipedia.org/wiki/1964_Alaska_earthquake

From Wikipedia:

> As a result of the earthquake, 131 people are believed to have died: Nine died as a result of the earthquake itself and another 122 died from the subsequent tsunamis all over the world. Five died from the tsunami in Oregon, and 12 died from the tsunami in Crescent City, California.

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