EveryQuake

Earthquakes in Pennsylvania

502 earthquakes catalogued in and around Pennsylvania between 1908 and 2026. Recorded measurements; not a forecast.

Last updated 4 August 2026 · merged from 5 catalogues
No records in the last 30 days.
502
recorded earthquakes
M5.2
largest
1908–2026
record span
1.65
mean magnitude
437
epicentre inside the border

By year

Stacked by magnitude; one column per year.

01172341908: 1 (M3–4)19081917192619351938: 1 (M3–4)194419531957: 1 (M3–4)19621964: 1 (M4–5)1964: 1 (M5+)19711973: 1 (M3–4)1974: 1 (M3–4)1976: 1 (M<3)1978: 3 (M3–4)1979: 1 (M<3)1980: 2 (M3–4)19801982: 2 (M<3)1983: 3 (M<3)1984: 1 (M<3)1984: 1 (M3–4)1984: 1 (M4–5)1985: 2 (M<3)1986: 2 (M<3)19891990: 1 (M<3)1991: 2 (M<3)1991: 1 (M3–4)1991: 1 (M4–5)1993: 8 (M<3)1994: 5 (M<3)1994: 2 (M4–5)1995: 5 (M<3)1996: 5 (M<3)1997: 3 (M<3)1997: 2 (M3–4)1998: 5 (M<3)1998: 1 (M4–5)19982000: 1 (M<3)2001: 1 (M3–4)2002: 1 (M<3)2003: 3 (M<3)2003: 1 (M3–4)2004: 2 (M<3)2005: 1 (M<3)2006: 6 (M<3)2007: 7 (M<3)20072008: 22 (M<3)2008: 1 (M3–4)2009: 15 (M<3)2010: 7 (M<3)2010: 1 (M3–4)2011: 8 (M<3)2011: 1 (M4–5)2012: 5 (M<3)2013: 4 (M<3)2014: 10 (M<3)2015: 3 (M<3)2016: 9 (M<3)20162017: 5 (M<3)2018: 10 (M<3)2019: 18 (M<3)2019: 1 (M3–4)2020: 10 (M<3)2021: 4 (M<3)2022: 3 (M<3)2023: 1 (M<3)2024: 232 (M<3)2024: 1 (M3–4)2024: 1 (M4–5)2025: 31 (M<3)20252026: 9 (M<3)
M<3M3–4M4–5M5+

Read this chart carefully. Rising columns do not mean earthquakes are becoming more frequent. The monitoring network improved over time: the smallest detectable earthquake in Türkiye was about M5.0 in 1966 and is M1.5 today. Earlier years look quiet because small events were not heard, not because they did not happen.

Largest earthquakes

Inclusion rule: the radius widens with magnitude (15 km up to M4, 150 km at M7 and above). This is not a measure of felt shaking or intensity.

MagnitudeDateDepthDistance
5.213.02.1964 19:4615 km86 km
4.705.04.2024 14:231 km236 km
4.516.01.1994 01:497 km155 km
4.512.05.1964 06:4533 km139 km
4.216.01.1994 00:425 km161 km
4.223.04.1984 01:365 km171 km
4.025.09.1998 19:5210 km233 km
4.031.12.2011 20:055 km258 km
4.017.06.1991 08:535 km297 km
3.831.05.1908 17:42186 km
3.823.03.1957 19:0210 km243 km
3.828.02.1973 08:2114 km240 km
3.711.03.1980 06:005 km236 km
3.705.04.2024 21:599.9 km243 km
3.505.03.1980 17:065 km231 km

Latest earthquakes

MagnitudeDateDepthDistance
2.415.06.2026 15:025 km200 km
1.607.06.2026 04:323.2 km157 km
1.231.05.2026 11:569 km239 km
1.819.05.2026 17:305 km246 km
1.023.04.2026 02:105 km247 km
1.412.03.2026 11:4410.1 km260 km
1.309.03.2026 01:048.4 km247 km
1.513.02.2026 20:405 km237 km
2.430.01.2026 20:427.5 km248 km
1.423.12.2025 08:245 km173 km
1.822.11.2025 06:579.3 km84 km
1.822.11.2025 04:227.2 km246 km
1.715.11.2025 07:375 km240 km
2.310.11.2025 08:128.3 km223 km
1.802.11.2025 01:065 km182 km
1.620.10.2025 18:466.2 km241 km
1.212.08.2025 01:026.2 km242 km
0.404.08.2025 06:324.9 km244 km
1.122.07.2025 03:255.2 km258 km
2.022.07.2025 01:005 km259 km
1.222.07.2025 00:195 km255 km
0.721.07.2025 21:515 km256 km
1.321.07.2025 18:265 km256 km
1.621.07.2025 09:405 km258 km
1.528.06.2025 02:301.3 km243 km
1.426.06.2025 14:151.9 km231 km
1.017.06.2025 02:263.6 km242 km
2.810.06.2025 20:048.3 km92 km
0.904.06.2025 07:255 km243 km
1.929.05.2025 14:305 km248 km
0.625.04.2025 00:176.7 km245 km
0.619.04.2025 03:374.6 km242 km
0.726.03.2025 04:245.9 km243 km
1.722.03.2025 07:545.7 km242 km
1.821.03.2025 12:238.1 km245 km
0.820.02.2025 03:312.5 km243 km
1.408.02.2025 14:024.2 km243 km
1.527.01.2025 19:083.8 km242 km
1.413.01.2025 11:281.8 km243 km
0.702.01.2025 01:0710.3 km242 km
0.728.11.2024 04:025.6 km242 km
1.626.11.2024 17:576.3 km243 km
1.825.11.2024 05:365.2 km257 km
1.022.11.2024 19:086 km242 km
1.314.11.2024 05:445 km244 km
0.613.11.2024 06:576.2 km244 km
1.608.11.2024 23:115 km244 km
1.024.10.2024 00:101.8 km244 km
1.323.10.2024 09:375.4 km242 km
1.021.10.2024 09:425.1 km244 km
1.315.10.2024 04:418.5 km242 km
0.802.10.2024 04:385.2 km244 km
1.630.09.2024 08:264.9 km243 km
1.920.09.2024 11:195.2 km243 km
1.518.09.2024 03:426.2 km243 km
1.616.09.2024 09:115 km248 km
1.314.09.2024 22:526.8 km242 km
1.613.09.2024 03:496.1 km248 km
2.511.09.2024 04:514.3 km263 km
1.410.09.2024 05:236.4 km244 km

Method and sources

What this page counts
An earthquake appears here when its epicentre is within a magnitude-dependent distance of this place's border: 15 km up to M4, 30 km to M5, 60 km to M6, 100 km to M7, and 150 km at M7 and above. The rule exists because a large earthquake concerns neighbouring provinces too — the 17 August 1999 epicentre was in the Gulf of İzmit, on no province's land at all.
Location precision
Epicentre uncertainty is typically 1–10 km, and larger for older records. That is why this site breaks data down to districts but not to neighbourhoods or villages — the data does not support that distinction.
Magnitude scales
The catalogues use more than twelve magnitude scales (Mw, ML, mb, Md…) and they are not equivalent. Values are shown on the scale the source reported; they are not converted.
Deduplication
The same earthquake is published by several catalogues. Records within 20 seconds and 100 km whose magnitudes differ by no more than 1.2 are treated as one event; the primary record is chosen by catalogue priority.
Updates
Recent earthquakes are fetched from four sources every five minutes. The historical archive is rebuilt infrequently.
Sources
USGS ComCat · ISC Bulletin · AFAD · Kandilli / KOERI · EMSC/CSEM
Reporting an error
If you spot a wrong record, write to us; we verify against the source and correct it.