4 ms·

I wish they'd actually link to the study. Most of NYC's skyscapers are in Manhattan, and are built in the areas where the Manhattan schist[1] is closest to the

I wish they'd actually link to the study. Most of NYC's skyscapers are in Manhattan, and are built in the areas where the Manhattan schist[1] is closest to the surface. The Bronx's geology is similar. Brooklyn and Queens don't benefit from the same geology, and have always had flooding problems. Those flooding problems are going to get worse with sea rise, but neither borough has the same density of skyrises that Manhattan does. It's not clear without the study whether they accounted for that. [1]: https://www.nycgovparks.org/parks/j-hood-wright-park/highlights/12369 https://www.nycgovparks.org/parks/j-hood-wright-park/highlig...

xyst 3y ago
Check it out for yourself: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022EF003465 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022EF00...
saalweachter 3y ago
My understanding is that Long Island (Brooklyn and Queens are the westernmost top of Long Island, for those not familiar with the local geography) is the remnants of the mountaintops of the Hudson Valley, that got scraped off during the last Ice Age and pushed into the ocean by the glaciers. Which means the whole island is essentially built on landfill.
Animats 3y ago
Oh, that article again. Even the article says "In New York City, buildings that exert the most downward pressure are skyscrapers, but most of these are anchored to bedrock (e.g., Barr et al., 2011). Hard rock elastic compression occurs instantaneously after a load is applied, meaning we do not expect to see ongoing subsidence under some of the largest loads unless the bedrock is heavily fractured." Parts of the outer boroughs are on fill, and they seem to be taking data that includes those areas and extrapolating it to the whole city. There are cities and buildings in far worse shape. Venice, discussed yesterday, is about 400 meters above bedrock. SF's Millennium Tower was built on pilings that didn't go down to bedrock, and it is settling. It's places with shallow-slope river deltas that have the worst problems, because the ground is often sand and silt carried by the river and bedrock is a long way down. In the US, that's only New Orleans. Hong Kong, though...[1] China has several major river delta cities. Also, their map label for "Manhattan" is in New Jersey. [1] https://www.mdpi.com/2072-4292/10/11/1738/htm https://www.mdpi.com/2072-4292/10/11/1738/htm
bobthepanda 3y ago
The schist thing is kind of a myth. A lot of the Lower Manhattan skyscrapers are built on landfill. The skyscraper districts are where they are because of transport links; Downtown and Midtown are the places with the most access to all parts of the metropolitan area, because Downtown was the historic center with all the ferry landings and bridges, and Midtown because the rail terminals stopped there.
anigbrowl 3y ago
I wish they'd actually link to the study. Tag the writer and the AP on Twitter and embarrass them for not including it. This works sometimes, and over time it nudges outlets towards including direct links.

xyst 3y ago

Check it out for yourself: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022EF003465 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022EF00...

saalweachter 3y ago

My understanding is that Long Island (Brooklyn and Queens are the westernmost top of Long Island, for those not familiar with the local geography) is the remnants of the mountaintops of the Hudson Valley, that got scraped off during the last Ice Age and pushed into the ocean by the glaciers. Which means the whole island is essentially built on landfill.

Animats 3y ago

Oh, that article again. Even the article says "In New York City, buildings that exert the most downward pressure are skyscrapers, but most of these are anchored to bedrock (e.g., Barr et al., 2011). Hard rock elastic compression occurs instantaneously after a load is applied, meaning we do not expect to see ongoing subsidence under some of the largest loads unless the bedrock is heavily fractured." Parts of the outer boroughs are on fill, and they seem to be taking data that includes those areas and extrapolating it to the whole city. There are cities and buildings in far worse shape. Venice, discussed yesterday, is about 400 meters above bedrock. SF's Millennium Tower was built on pilings that didn't go down to bedrock, and it is settling. It's places with shallow-slope river deltas that have the worst problems, because the ground is often sand and silt carried by the river and bedrock is a long way down. In the US, that's only New Orleans. Hong Kong, though...[1] China has several major river delta cities. Also, their map label for "Manhattan" is in New Jersey. [1] https://www.mdpi.com/2072-4292/10/11/1738/htm https://www.mdpi.com/2072-4292/10/11/1738/htm

bobthepanda 3y ago

The schist thing is kind of a myth. A lot of the Lower Manhattan skyscrapers are built on landfill. The skyscraper districts are where they are because of transport links; Downtown and Midtown are the places with the most access to all parts of the metropolitan area, because Downtown was the historic center with all the ferry landings and bridges, and Midtown because the rail terminals stopped there.

anigbrowl 3y ago

I wish they'd actually link to the study. Tag the writer and the AP on Twitter and embarrass them for not including it. This works sometimes, and over time it nudges outlets towards including direct links.