Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Sinking Spring, PA
No earthquake was likely felt in Sinking Spring in the 24 hours to 10:24 pm EST (03:24 UTC). The last one was M 1.9, 4 km (2 mi) SE, at 4:36 pm EDT on 19 April 2024, estimated intensity II (weak) in town; 59 felt reports to USGS. Every earthquake near Sinking Spring
This page: a magnitude 1.7 earthquake was recorded 3 km (2 mi) west of Sinking Spring, PA, at 1:40 pm EST on 7 November 2021 (18:40 UTC), 5.0 km deep. 34 people have reported feeling it to USGS.
USGS: 2 km W of Sinking Spring, Pennsylvania
10 km (6 mi) W of Reading, PA · 85 km (53 mi) WNW of Philadelphia, PA
- When
- 1:40 pm EST on 7 November 2021 ()
- Where
- 3 km (2 mi) west of Sinking Spring, PA · earthquakes near Sinking Spring
- Magnitude
- M 1.7 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 34 reports · strongest reported intensity III
- Nearest
- Berks County, 14 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1762 days ago
Earthquake alerts for Sinking Spring, PA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 11 km (7 mi) from the epicentre. In Sinking Spring, 3 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Whitfield, Wernersville, West Lawn, West Wyomissing, Lincoln Park, Montrose.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 40.3232, -76.0401. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Berks County, PA | 14 km (9 mi) | NE | earthquakes near Berks County |
| Lancaster County, PA | 36 km (22 mi) | SSW | earthquakes near Lancaster County |
| Lebanon County, PA | 36 km (23 mi) | W | earthquakes near Lebanon County |
| Schuylkill County, PA | 45 km (28 mi) | NNW | earthquakes near Schuylkill County |
| Chester County, PA | 46 km (29 mi) | SSE | earthquakes near Chester County |
| Lehigh County, PA | 50 km (31 mi) | NE | earthquakes near Lehigh County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.9 0 km W of Shillington, Pennsylvania
- 1.7 1 km SSW of Alburtis, Pennsylvania
- 2.1 2 km WSW of Sinking Spring, Pennsylvania
- 1.5 6 km N of Wernersville, Pennsylvania
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.