Believe it or not, I’m a fully qualified geologist and I was intrigued by this, so I asked the Google Meister whether it could dig up something on USGS and faults and New York. That’s how I stumbled upon this map of historic earthquakes in this 2020 article.

This does not show the fault that runs through NYC, obviously, but it’s likely undoubtedly part of the same system.

https://www.researchgate.net/publication/347286597_Borehole_research_in_New_York_State_can_advance_utilization_of_low-enthalpy_geothermal_energy_management_of_potential_risks_and_understanding_of_deep_sedimentary_and_crystalline_geologic_systems/

Today’s Scientific American has the skinny, so to speak (but not really, at 18:09 BST, but they are promising to keep updating the article): https://www.scientificamerican.com/article/earthquake-shakes-new-jersey-new-york-state-pennsylvania-and-more/

USGS info: https://earthquake.usgs.gov/earthquakes/eventpage/at00sbh3yv/region-info

General info at Cornell, based in Ithaca, visible in the above map as well as the one below: https://deepgeothermalheat.engineering.cornell.edu/cubo-science-intro/earthquakes-in-new-york-state/

To sum it up, it’s not as rare as most people assume, but most earthquakes in the area are a lot less noticeable.

I deleted some rambling about charnockites and granulites here, and mangerites.

https://en.m.wikipedia.org/wiki/Mangerite