QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

27 km NE of Rockport, Massachusetts

· 7.9 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Essex County 46 kmRockingham County 64 kmYork County 73 kmSuffolk County 75 kmStrafford County 77 kmMiddlesex County 92 kmPlymouth County 97 kmNorfolk County 98 kmCumberland County 111 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
7.9 km below the surface
Felt
no reports yet
Nearest
Essex County, 46 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2633 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 42.8106, -70.3564. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Essex County, MA 46 km (28 mi) ENE of here earthquakes near Essex County
Rockingham County, NH 64 km (40 mi) ESE of here earthquakes near Rockingham County
York County, ME 73 km (45 mi) SSE of here earthquakes near York County
Suffolk County, MA 75 km (47 mi) NE of here earthquakes near Suffolk County
Strafford County, NH 77 km (48 mi) SE of here earthquakes near Strafford County
Middlesex County, MA 92 km (57 mi) ENE of here earthquakes near Middlesex County

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

Aftershocks so far

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

  1. 2.1 34 km SE of York Beach, Maine
  2. 1.6 3 km SSE of Greenland, New Hampshire
  3. 2.0 13 km SE of York Harbor, Maine
  4. 2.0 10 km SE of York Harbor, Maine
  5. 3.8 9 km SE of York Harbor, Maine
  6. 2.3 54 km E of Rockport, Massachusetts
  7. 1.9 42 km ENE of Rockport, Massachusetts
  8. 2.0 15 km N of Rockport, Massachusetts
  9. 2.4 29 km ESE of York Beach, Maine
  10. 1.9 1 km SSW of Rye, New Hampshire
  11. 1.5 27 km SE of Gloucester, Massachusetts

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.