QuakeIndex

Earthquakes in Pennsylvania

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Too few earthquakes here to say what is "normal"

Only 156 earthquakes of M1.5 or largerhave been recorded in Pennsylvania in the 10 years of record we hold, and most weeks have none. A QuakeIndex score is a percentile against this place's own weeks — and when almost every week is empty, that number would just be reporting whether anything happened at all, dressed up as a percentile. So we do not publish one.

This is a statement about Pennsylvania, not about our data: it is a quiet place. There have been none of M1.5 or larger in the last 7 days.

USGS catalogue · updated

The last 30 days

Aug 29 Sep 13 Sep 27
Each mark is a day's largest quake within range; its size is the magnitude. There is not yet enough history here to draw a normal range.

Live · last 7 days

Latest earthquakes in Pennsylvania

None in Pennsylvania in the latest snapshot we hold; the full 7 days load from USGS as this page opens.

Source USGS · snapshot of

Where this is

Centre 40.621, -77.660 — the mean of this state’s place centroids, from the US Census Bureau Gazetteer (2024). Activity is measured across a rectangle drawn around the state, so a few earthquakes just over its border are counted too.

Largest on record in and around Pennsylvania

MagnitudeWhenWhere
M 4.8 2024 Tewksbury, New Jersey Earthquake
M 3.7 7 km WSW of Gladstone, New Jersey
M 3.4 9 km N of Blain, Pennsylvania
M 3.0 3 km NE of Ranson, West Virginia
M 2.9 5 km WSW of Bolivar, Pennsylvania
M 2.9 7 km WSW of Gladstone, New Jersey
M 2.9 6 km E of Califon, New Jersey
M 2.8 5 km ESE of East Berlin, Pennsylvania

From the QuakeIndex catalogue, built from the USGS FDSN event service · inside a rectangle drawn around Pennsylvania, which takes in some ground over its borders.

Counties in Pennsylvania

After an earthquake here