SDC is not only a function of location, but also the type of soil (site class) your structure will be built on. And what it is constructed of can impact the SDC.
It depends where on Long Island. Queens & Brooklyn (aka Kings) are part of NYC, in which case you need the NYC Building Code. NYC has stringent seismic requirements (although, I heard that they are going to be relaxed somewhat based on new rock acceleration studies.)
According to NYSDOT, Suffolk County, which is the eastern portion of Long Island, is Category B; Nassau County, which is in the middle of the island, falls under the NYC Downstate criteria - Category C.
Attached is the NYSDOT Seismic Vulnerability Manual for bridges (I know you're not building a bridge) there's a state map at the end that shows the category for each county.
Interesting division since north has glacial morain and the south doesn't.The limits of the morain are obvious looking at neighborhood names .By the Verrazano Bridge is Bay Ridge then names like Park Slope ,Brooklyn Heights ,Crown Heights,Richmond Hill etc !!
Robertmet - I lived in Richmond Hill Queens for most of my life.
Interesting theory about the neighborhood names. I don't know about the others but RH was named after a village in England by the real estate developer.
Bridgebuster, get a map of Brooklyn and Queens with neighborhoods named .You can draw a continuous line through those places.There are drawings somewhere that show the morain line and it continues the length of Long Island separating north from south !! BTW Crown Heights was originally Crow Hill !
Robertmet - I'm aware of the terminal morain on LI; the sand mines in parts of Nassau & Suffolk. My post wasn't challenging the historic fact of the morain.
As I said before, the name was chosen by a land developer who came to the area in the 1800's.
According to Wikipedia, the "hill" of Richmond Hill was formed by the Wisconsin glacier. However, I lived there for 40 years and can assure you that no one know where "Richmond Hill" is. The part of RH near Forest Park is higher ground but for the most part RH is flat.
