Earthquakes in Pennsylvania

Pennsylvania sits deep within the stable interior of the North American plate, far from any boundary, so damaging earthquakes are rare. But old faults in the hard eastern bedrock still slip occasionally, and because that cold crust carries energy so efficiently, even a small quake can be felt across a wide area — often as a sudden boom.

This page tracks live USGS seismic activity across Pennsylvania — 6 cities including Philadelphia, Pittsburgh, Allentown. The map and list above update continuously; open any city for a closer view with its own recent-quake and felt-radius detail.