QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mwr

9 km SE of York Harbor, Maine

· 11 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N York County 41 kmRockingham County 44 kmStrafford County 45 kmEssex County 53 kmCumberland County 85 kmBelknap County 86 kmSuffolk County 89 kmMiddlesex County 94 kmMerrimack County 94 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 3.8 (mwr)
Depth
11 km below the surface
Felt
42440 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
York County, 41 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 121 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 42440 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× more

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 43.0657, -70.5707. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
York County, ME 41 km (25 mi) S of here earthquakes near York County
Rockingham County, NH 44 km (27 mi) ENE of here earthquakes near Rockingham County
Strafford County, NH 45 km (28 mi) ESE of here earthquakes near Strafford County
Essex County, MA 53 km (33 mi) NNE of here earthquakes near Essex County
Cumberland County, ME 85 km (53 mi) SSW of here earthquakes near Cumberland County
Belknap County, NH 86 km (53 mi) SE of here earthquakes near Belknap County

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

Aftershocks so far

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

  1. 1.7 2 km NE of Danville, New Hampshire
  2. 2.1 34 km SE of York Beach, Maine
  3. 1.6 3 km SSE of Greenland, New Hampshire
  4. 2.0 13 km SE of York Harbor, Maine
  5. 2.0 10 km SE of York Harbor, Maine

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.