QuakeIndex

quarry blast · reviewed by a seismologist

M 2.0ml

3 km E of Plainville, Connecticut

· 0.0 km deep · released about 30 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Capitol Planning Region 26 kmNaugatuck Valley Planning Region 28 kmLower Connecticut River Valley Planning Region 39 kmNorthwest Hills Planning Region 39 kmSouth Central Connecticut Planning Region 42 kmHampden County 54 kmSoutheastern Connecticut Planning Region 63 kmGreater Bridgeport Planning Region 63 kmWestern Connecticut Planning Region 68 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 2.0 (ml)
Depth
0.0 km below the surface
Felt
10 reports · strongest reported intensity III
Nearest
Capitol Planning Region, 26 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 336 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 10 people have reported feeling it to USGS.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
  3. Around the size people start to feel M 3.0 32× the energy of this one
  4. This earthquake M 2.0 about 30 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 41.6718, -72.8187. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Capitol Planning Region, CT 26 km (16 mi) SW of here earthquakes near Capitol Planning Region
Naugatuck Valley Planning Region, CT 28 km (17 mi) NE of here earthquakes near Naugatuck Valley Planning Region
Lower Connecticut River Valley Planning Region, CT 39 km (24 mi) NW of here earthquakes near Lower Connecticut River Valley Planning Region
Northwest Hills Planning Region, CT 39 km (24 mi) ESE of here earthquakes near Northwest Hills Planning Region
South Central Connecticut Planning Region, CT 42 km (26 mi) N of here earthquakes near South Central Connecticut Planning Region
Hampden County, MA 54 km (33 mi) SSW of here earthquakes near Hampden 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. 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. 1.9 2 km N of East Haddam, 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.