QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

2 km NNE of East Haddam, Connecticut

· 8.3 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lower Connecticut River Valley Planning Region 7 kmSoutheastern Connecticut Planning Region 29 kmSouth Central Connecticut Planning Region 38 kmCapitol Planning Region 40 kmNaugatuck Valley Planning Region 54 kmNortheastern Connecticut Planning Region 57 kmSuffolk County 62 kmWashington County 69 kmGreater Bridgeport Planning Region 71 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 1.9 (ml)
Depth
8.3 km below the surface
Felt
32 reports · strongest reported intensity III
Nearest
Lower Connecticut River Valley Planning Region, 7 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 124 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 32 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 41.4697, -72.4468. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lower Connecticut River Valley Planning Region, CT 7 km (4 mi) NE of here earthquakes near Lower Connecticut River Valley Planning Region
Southeastern Connecticut Planning Region, CT 29 km (18 mi) W of here earthquakes near Southeastern Connecticut Planning Region
South Central Connecticut Planning Region, CT 38 km (24 mi) ENE of here earthquakes near South Central Connecticut Planning Region
Capitol Planning Region, CT 40 km (25 mi) SSE of here earthquakes near Capitol Planning Region
Naugatuck Valley Planning Region, CT 54 km (33 mi) E of here earthquakes near Naugatuck Valley Planning Region
Northeastern Connecticut Planning Region, CT 57 km (36 mi) SW of here earthquakes near Northeastern Connecticut Planning Region

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

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

  1. 1.5 2 km SSW of Deep River Center, 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.