Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Tremont, ME
No earthquake was likely felt in Tremont in the 24 hours to 7:21 am EST (12:21 UTC). The last one was M 1.8, 12 km (8 mi) W, at 1:52 pm EDT on 28 August 2025, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Tremont
This page: a magnitude 1.9 earthquake was recorded 4 km (3 mi) west of Tremont, ME, at 12:33 am EDT on 22 May 2021 (04:33 UTC), 5.0 km deep. 19 people have reported feeling it to USGS.
USGS: 4 km W of Tremont, Maine
- When
- 12:33 am EDT on 22 May 2021 ()
- Where
- 4 km (3 mi) west of Tremont, ME · earthquakes near Tremont
- Magnitude
- M 1.9 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 19 reports · strongest reported intensity IV
- Nearest
- Hancock County, 34 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1734 days ago
Earthquake alerts for Tremont, ME
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Tremont, 4 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Sedgwick, Trenton, Bar Harbor, Deer Isle, Stonington, Surry.
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.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- 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.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 44.2583, -68.4029. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Hancock County, ME | 34 km (21 mi) | N | earthquakes near Hancock County |
| Knox County, ME | 56 km (35 mi) | WSW | earthquakes near Knox County |
| Waldo County, ME | 62 km (38 mi) | WNW | earthquakes near Waldo County |
| Lincoln County, ME | 93 km (58 mi) | WSW | earthquakes near Lincoln County |
| Washington County, ME | 101 km (63 mi) | NE | earthquakes near Washington County |
| Kennebec County, ME | 110 km (68 mi) | W | earthquakes near Kennebec County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
15 earthquakes have been recorded within 50 km since this one.
- 1.8 2 km NNW of Ellsworth, Maine
- 1.5 4 km WNW of Milbridge, Maine
- 1.8 6 km ESE of Brooklin, Maine
- 2.5 4 km SW of Vinalhaven, Maine
- 1.8 4 km SW of Blue Hill, Maine
- 1.5 2 km ESE of Eastbrook, Maine
- 1.9 6 km SE of North Penobscot, Maine
- 1.6 6 km ESE of Dedham, Maine
- 2.0 7 km E of Dedham, Maine
- 2.0 7 km ESE of Dedham, Maine
- 3.3 7 km ESE of Dedham, Maine
- 1.8 7 km ESE of Dedham, Maine
- 1.9 8 km ESE of Dedham, Maine
- 1.9 4 km WNW of Steuben, Maine
- 1.9 7 km E of Dedham, 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.