QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4 km NNE of West Alexander, Pennsylvania

· 1.0 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ohio County 13 kmBrooke County 16 kmWashington County 21 kmMarshall County 36 kmJefferson County 37 kmGreene County 40 kmHancock County 42 kmBelmont County 44 kmHarrison County 54 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.1 (ml)
Depth
1.0 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Ohio County, 13 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3425 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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.

Where

Epicentre 40.1458, -80.4838. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ohio County, WV 13 km (8 mi) ENE of here earthquakes near Ohio County
Brooke County, WV 16 km (10 mi) SSE of here earthquakes near Brooke County
Washington County, PA 21 km (13 mi) WSW of here earthquakes near Washington County
Marshall County, WV 36 km (22 mi) NNE of here earthquakes near Marshall County
Jefferson County, OH 37 km (23 mi) SE of here earthquakes near Jefferson County
Greene County, PA 40 km (25 mi) NNW of here earthquakes near Greene County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

2 earthquakes have been recorded within 50 km since this one.

  1. 2.5 4 km WNW of Claysville, Pennsylvania
  2. 2.2 2 km SW of Green Hills, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.