Earthquake · reviewed by a seismologist
M 1.5ml
4 km WSW of North Woodstock, New Hampshire
- When
- Magnitude
- M 1.5 (ml)
- Depth
- 3.8 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Grafton County, 13 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1246 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 44.0190, -71.7355. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Grafton County, NH | 13 km (8 mi) | NE of here | earthquakes near Grafton County |
| Carroll County, NH | 46 km (29 mi) | WNW of here | earthquakes near Carroll County |
| Orange County, VT | 51 km (32 mi) | E of here | earthquakes near Orange County |
| Caledonia County, VT | 58 km (36 mi) | SSE of here | earthquakes near Caledonia County |
| Belknap County, NH | 61 km (38 mi) | NNW of here | earthquakes near Belknap County |
| Washington County, VT | 75 km (47 mi) | ESE of here | earthquakes near Washington County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.6 2 km SW of Center Sandwich, New Hampshire
- 2.6 3 km SE of Haverhill, New Hampshire
- 1.8 3 km SW of Center Sandwich, New Hampshire
- 2.9 4 km SW of Center Sandwich, New Hampshire
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.