Pennsylvania Earthquake History

Name: Pennsylvania — earthquake history (magnitude 4.5+)
Creator: U.S. Geological Survey
License: https://www.usa.gov/government-works

Since May 12, 1964, the USGS has recorded 3 earthquakes of magnitude 4.5 or greater in Pennsylvania. The strongest was M 4.6.

By decade

'60

'90

Strongest in Pennsylvania

M 4.6 · 2 km W of Sinking Spring, PennsylvaniaJanuary 16, 1994 M 4.5 · 2 km N of Cornwall, PennsylvaniaMay 12, 1964 M 4.5 · 2 km SW of Adamsville, PennsylvaniaSeptember 25, 1998

All recorded earthquakes

M 4.5 mwcSeptember 25, 1998

2 km SW of Adamsville, Pennsylvania · depth 5 km

M 4.6 mbJanuary 16, 1994

2 km W of Sinking Spring, Pennsylvania · depth 5 km

M 4.5 mbMay 12, 1964

2 km N of Cornwall, Pennsylvania · depth 1 km

Source: U.S. Geological Survey, Earthquake Hazards Program. Older and smaller earthquakes are under-counted relative to recent decades as instrumentation improved. A record of past shaking is not a forecast. See About the Data.