Earthquake · reviewed by a seismologist
M 2.1ml
8 km SE of South Portland, Maine
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 6.7 km below the surface
- Felt
- 135 reports · strongest reported intensity IV
- Nearest
- Cumberland County, 28 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1698 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 135 people have reported feeling it to USGS.
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.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- 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 43.5824, -70.1738. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Cumberland County, ME | 28 km (17 mi) | SSE of here | earthquakes near Cumberland County |
| York County, ME | 44 km (27 mi) | ENE of here | earthquakes near York County |
| Sagadahoc County, ME | 46 km (28 mi) | SW of here | earthquakes near Sagadahoc County |
| Androscoggin County, ME | 65 km (40 mi) | S of here | earthquakes near Androscoggin County |
| Lincoln County, ME | 70 km (44 mi) | SW of here | earthquakes near Lincoln County |
| Strafford County, NH | 77 km (48 mi) | ENE of here | earthquakes near Strafford 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.
- 1.8 2 km SW of Gray, Maine
- 1.9 8 km ENE of Lake Arrowhead, Maine
- 1.9 3 km WSW of Dayton, Maine
- 2.4 42 km SE of Old Orchard Beach, Maine
- 2.6 38 km SE of Old Orchard Beach, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.