1cm/day is really fast. I'm surprised people could build on that at all. I guess over any given short distance the relative movement is small enough that stuff doesn't just break instantly.

Unless the given short distance is that between your house and the edge of a cliff.

1 cm/day is really slow once you reach freefall.

Only slightly more impending a doom than all the people who live & continue to build homes in wildfire zones.

That's fast enough that a lot of structures have to be substantially offset from the surveyed property lines.* Do people hold title to the static imaginary plot or to the non-imaginary land that's fallen off a cliff? Might a downslope plotholder evict upslope people whose house has slid over the property line? Etc. etc. Muchly hilarious.
*Assuming the lines are defined relative to some CA datum that isn't moving SW 1cm/day.

This reminds me of the movie where Linda Hamilton's mom who wouldn't leave her house and Pierce Brosnan had to go save her. But in the end, when her geandkids were in danger because of her ignorance, she jumped into acid to save them.

These kind of medium-scale geologic phenomenons are fascinating. My favorite is the "Great Raft" where a 100+ mile logjam persisted on the Red and Atchafalaya rivers for a millennium, stopping the Mississippi from changing routes.

https://en.wikipedia.org/wiki/Great_Raft

Just like enough trees kept growing and falling in for long enough that the logjam never went away.

https://en.m.wikipedia.org/wiki/St._Lucia%27s_flood

Much faster, but also cool.
https://earthobservatory.nasa.gov/images/153158/landslide-dams-the-chilcotin-river
https://earthobservatory.nasa.gov/images/153195/chilcotin-rivers-landslide-lake-begins-draining

That is really neat. Worth getting up so I could look at it on a bigger screen. Thanks.

This is an area where I stomped around a bit in the distant past and the n again last year--mostly in the park areas along the sea bluffs just to the immediate west. The roads, and simply everything else show multiple signs of active slumping.

Here's a Google maps terrain view of the area...which looks like a a bunch of slump blocks...

Reminds of two slide/earthquake -created lakes in northwestern Wyoming and southeastern Montana. The Gros Ventre slide in 1925 created Slide Lake which then killed a number of people and destroyed a town when the slide dam was breached. In 1959 an earthquake not too far to the northwest created Quake Lake. Based on the previous experience, a spillway/outlet was rapidly constructed to forestall flooding.

I took a geology survey class at Cal and they sent us wandering the streets of Berkeley's hillier neighborhoods to map sidewalks and streets that were no longer straight. IIRC the stadium is in 2 pieces that are no longer perfectly aligned.

That's why Ohio State has a horseshoe stadium. Can't tell as easily that the Olengtangy river is claiming the land on the west side.

13: Yep, it's right on top of the Hayward Fault (1.2 mm/yr). They knew to put in expansion joints back in the 1920s, but it still got to the point of needing major renovation about 10 years ago. attempting to engineer more stability for whenever the next major quake happens. Small cracks continue to appear and get patched as needed.

It was a fun assignment, anyway.

Mass wasting is often fun.

You can't waste mass. It just turns into energy.

I know Pittsburgh street numbering is wonky, but 42nd Street in Lawrenceville is just over the top. A straight stretch of road with no major intersections and no municipal boundaries went from 400s to 200s and then back to 300s. How do people not die while the ambulance driver scratches his head?

On topic because geography is almost the same as geology.

My house number, 1820, is in between 1812 and 1818. It's extremely mysterious and no one knows why.

There's a couple of roads in Hong Kong, and one village in Scotland, where house numbers reflect not location but the order in which the houses were built. Apparently people just learn it.

House numbering in Berlin is peculiar in that some streets are not even on one side and odd on the other, but instead go all the way up one side and then continue on the other side. So one block might be 12-18 on one side, and 42-49 on the other. But not every street is like that!

And at least they dealt with in-fill building by just adding letters to the numbers, so that if originally a villa on Dougstrasse with the number 12 occupied the whole block between Heebiestrasse and Geebiestrasse, buildings built afterward would be 12A, 12B, etc.

19: Looking at Google maps* it looks mostly like there whole blocks do not change, but rather there are some some random lower house numbers inserted here and there (some look like more recent additions). And there is then one discontinuity. So 280, 298, 308, 319, 312, and 330 seem out of sequence among other houses in order in the high 300s. And further down the street it suddenly skips 50 or so from 310s to 260s. So pretty odd, and does not seem to be repeated on any parallel streets.

*Reminded me that for several years, Google Street View a couple of blocks over caught my son crossing the sidewalk in front of his then-girlfriend's house. Streetview updated since then.

There's a couple of roads in Hong Kong, and one village in Scotland, where house numbers reflect not location but the order in which the houses were built. Apparently people just learn it.

In high school, I had a teacher who grew up in India who said the same thing - she made it sound like a universal statement about all of India, or at least I heard it that was at age 16. I've never shared this before out of fear of sounding like an idiot, since India is a big place and this truly can't be all of India. It's just now as I'm writing it out that I'm realizing that she probably qualified the statement significantly.

Venice has anagraphic house numbers - I am not sure if it's the order of building or what, but the numbers are arbitrary four-digit integers and don't convey any information beyond that.

Well, not quite that bad. If you're standing outside the one you were looking for it conveys one bit of information - you found it - and if you're standing outside any other you also get one bit of information - you didn't!

Numbering by order of building is also the Japanese system, IIRC. It makes sense for cities that tend to grow incrementally rather than through big master-planned subdivisions.