Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Spring Ridge, PA
No earthquake was likely felt in Spring Ridge in the 24 hours to 8:03 am EST (13:03 UTC). The last one was M 1.9, 5 km (3 mi) SSE, at 4:36 pm EDT on 19 April 2024, estimated intensity II (weak) in town; 59 felt reports to USGS. Every earthquake near Spring Ridge
This page: a magnitude 1.7 earthquake was recorded in Spring Ridge, PA, at 5:48 am EDT on 12 September 2018 (09:48 UTC), 2.0 km deep. 45 people have reported feeling it to USGS.
USGS: 1 km NNW of Spring Ridge, Pennsylvania
7 km (4 mi) WNW of Reading, PA · 83 km (52 mi) WNW of Philadelphia, PA
- When
- 5:48 am EDT on 12 September 2018 ()
- Where
- in Spring Ridge, PA · earthquakes near Spring Ridge
- Magnitude
- M 1.7 (ml)
- Depth
- 2.0 km below the surface
- Felt
- 45 reports · strongest reported intensity IV
- Nearest
- Berks County, 8 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2008 days ago
Earthquake alerts for Spring Ridge, 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 12 km (7 mi) from the epicentre. 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: Colony Park, Wyomissing Hills, Greenfields, Whitfield, River View Park, Fox Chase.
How big was it?
This earthquake released about 10 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 1,500,000× 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 92× the energy of this one
- This earthquake M 1.7 about 10 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 40.3683, -75.9943. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Berks County, PA | 8 km (5 mi) | NE | earthquakes near Berks County |
| Lebanon County, PA | 40 km (25 mi) | W | earthquakes near Lebanon County |
| Schuylkill County, PA | 42 km (26 mi) | NNW | earthquakes near Schuylkill County |
| Lancaster County, PA | 42 km (26 mi) | SSW | earthquakes near Lancaster County |
| Lehigh County, PA | 44 km (27 mi) | NE | earthquakes near Lehigh County |
| Chester County, PA | 49 km (30 mi) | SSE | earthquakes near Chester County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 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
- 1.7 2 km W of Sinking Spring, Pennsylvania
- 2.2 4 km NW of Spring Ridge, Pennsylvania
- 1.6 5 km NNE 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.