Recent comments in /f/Washington

Nixx_Mazda OP t1_j8mhsij wrote

Thanks. It's a short story. I pretty much just cropped it.

I suuuuuuuck at editing. These were pretty good straight out of camera, though. I shoot RAW+JPG, here's some of the SOOC JPGs.

https://i.imgur.com/8NDmRdc.jpg

It was a good day. This is 5934, cropped some. The light trails are fun. 5930 is a very good one, especially when cropped on the mountain.

Canon RP, 24-105 f/4L at f/4, 1/3 sec, ISO 400

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Norwester77 t1_j8lv0iz wrote

We certainly had some damage: a major roadway along Capitol Lake collapsed, some large masonry blocks fell off the corner of an old bank building, and the Capitol dome was set rolling like a top on its base (at the time, it was held in place by gravity alone, but it’s since been pinned to the building)!

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normalabby t1_j8lu7ng wrote

No disagreement on a differently located quake, just want to make sure we're not telling folks all the glacial till this region is built on is cushioning us. It didn't make the Nisqually less intense, the distance did. Someone would've felt the Nisqually more anywhere in the Puget Sound region that's on top of glacial till more than riding it out on bedrock, in the few places that exists.

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Norwester77 t1_j8ltqa0 wrote

I went on a city tour of Olympia (my hometown and the urban area closest to the epicenter), and the tour guide explained that the architect who designed a lot of the buildings in Olympia’s downtown core didn’t really know what he was doing and over-built everything, which has probably helped protect downtown against several quakes over the decades.

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PhuckSJWs t1_j8lt7kl wrote

For sure, there WAS liquefaction, but it was very limited and low impact and almost entirely in the industrial areas south of downtown where it is mostly just garbage till soil on top of old tidal flats.

given the widescale "terraforming" the settlers did to the original Seattle hills to level out the city, it (liquefaction) was extremely limited in location and impact. we will not be so lucky with a closer and shallower quake.

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normalabby t1_j8lsk2q wrote

But important to note there was liquefaction in SODO. It's a bit amusing to read this and think someone was surprised to find evidence of liquefaction in an area like SODO that is loose fill. It's a given, today. https://www.washington.edu/news/2001/04/17/damaged-chimneys-and-unexpected-liquefaction-from-nisqually-temblor-yield-earthquake-insights-uw-scientists-say/

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PhuckSJWs t1_j8lrncx wrote

we were far enough away, and across several fault areas, that the soils did dampen the shock wave somewhat in places by the time it got here.

that said, a strong quake near to Seattle (e.g., one on the Seattle fault) will likely trigger liquefaction locally in places due to strength AND proximity. that was not an issue with the nisqually quake. by the time the waves got here we got lots of shaking and damage to old infrastructure, but the skyscrapers handled it like they were designed, and for the most part we mostly suffered cosmetic damage and not a HUGE amount of infrastructure damage.

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normalabby t1_j8lrdmk wrote

Beyond building differences what is important to understand is that the way of measuring earthquakes is a logarithmic scale. The difference between 6.8 and 7.5 is significant, logarithmically.

Also Richter isn't used anymore, really, moment magnitude is the scale typically used https://www.usgs.gov/faqs/moment-magnitude-richter-scale-what-are-different-magnitude-scales-and-why-are-there-so-many

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