QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km ESE of Ledyard, Connecticut

· 5.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Southeastern Connecticut Planning Region 12 kmWashington County 30 kmLower Connecticut River Valley Planning Region 43 kmKent County 43 kmNortheastern Connecticut Planning Region 46 kmNewport County 59 kmProvidence County 59 kmCapitol Planning Region 66 kmBristol County 66 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 1.8 (ml)
Depth
5.0 km below the surface
Felt
103 reports · strongest reported intensity IV
Nearest
Southeastern Connecticut Planning Region, 12 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 847 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 103 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 41.4285, -71.9828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Southeastern Connecticut Planning Region, CT 12 km (7 mi) ESE of here earthquakes near Southeastern Connecticut Planning Region
Washington County, RI 30 km (19 mi) W of here earthquakes near Washington County
Lower Connecticut River Valley Planning Region, CT 43 km (26 mi) E of here earthquakes near Lower Connecticut River Valley Planning Region
Kent County, RI 43 km (27 mi) SW of here earthquakes near Kent County
Northeastern Connecticut Planning Region, CT 46 km (29 mi) S of here earthquakes near Northeastern Connecticut Planning Region
Newport County, RI 59 km (37 mi) W of here earthquakes near Newport County

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

Aftershocks so far

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

  1. 1.5 2 km SSW of Deep River Center, Connecticut
  2. 1.9 2 km NNE of East Haddam, Connecticut
  3. 2.2 1 km S of Moodus, Connecticut
  4. 1.8 2 km W of Conning Towers-Nautilus Park, Connecticut
  5. 1.9 2 km N of East Haddam, Connecticut
  6. 1.8 1 km NNW of Essex Village, Connecticut
  7. 1.8 2 km SSW of Moodus, Connecticut
  8. 2.2 1 km NNE of Moodus, Connecticut

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.