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re: The prolific “4.8 earthquake” felt across northeast US.

Posted on 4/5/24 at 10:08 am to
Posted by teke184
Zachary, LA
Member since Jan 2007
96540 posts
Posted on 4/5/24 at 10:08 am to
It is unusual to get one in that area.

HOWEVER

A 4.5 doesn’t even cause people to break their stride on the west coast.
Posted by Figgy
CenCal
Member since May 2020
7262 posts
Posted on 4/5/24 at 1:51 pm to
quote:

A 4.5 doesn’t even cause people to break their stride on the west coast.


True. But I'm not sure if places like the northeast build to our standards though. We have to take that into account out here.
Posted by Swamp Angel
Georgia
Member since Jul 2004
7317 posts
Posted on 4/5/24 at 2:00 pm to
quote:

A 4.5 doesn’t even cause people to break their stride on the west coast.


A 4.5 quake on the west coast feels different than it does on the east coast. It's not because they're used to quakes out west and have seen much. much more powerful quakes, it's because of the bedrock and the structure deep down.

The eastern US has a larger, harder, more brittle layer of bedrock than the west coast. It'd take me forever to try to explain it, but here's a link to lay out the basics:

Why East Coast Earthquakes Travel So Far (phys.org 23 Aug 2011)
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