New Hampshire has some ancient volcanoes and also the worlds worst weather atop Mt Washington, so it seems reasonable it has a weird mantle layer of extra hot core messing with the surface.
There’s a hot rock blob under New Hampshire. It could be why the Appalachian Mountains are standing tall | CNN
A hot blob of rock beneath New Hampshire may be helping the Appalachian Mountains stand so tall. The rock mass is slowly on the move, headed one day for New York.
cnn.com