Earthquake · reviewed by a seismologist
M 2.1ml
2 km NNW of Milford, New Hampshire
- When
- Magnitude
- M 2.1 (ml)
- Depth
- 8.5 km below the surface
- Felt
- 221 reports · strongest reported intensity IV
- Nearest
- Hillsborough County, 8 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 149 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 221 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 42.8589, -71.6613. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Hillsborough County, NH | 8 km (5 mi) | SE of here | earthquakes near Hillsborough County |
| Middlesex County, MA | 47 km (29 mi) | NNW of here | earthquakes near Middlesex County |
| Rockingham County, NH | 48 km (30 mi) | WSW of here | earthquakes near Rockingham County |
| Cheshire County, NH | 48 km (30 mi) | E of here | earthquakes near Cheshire County |
| Merrimack County, NH | 49 km (30 mi) | S of here | earthquakes near Merrimack County |
| Worcester County, MA | 65 km (40 mi) | NNE of here | earthquakes near Worcester County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has been recorded within 50 km since this one.
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.