Earthquake · reviewed by a seismologist
M 4.1mwr
3 km NNE of Little Creek, Delaware
- When
- Magnitude
- M 4.1 (mwr)
- Depth
- 9.9 km below the surface
- Felt
- 14574 reports · strongest reported intensity V
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- Kent County, 13 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 45 days ago
This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 14574 people have reported feeling it to USGS.
How big was it?
This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 7,900× the energy of this one
- Mineral, Virginia 2011 M 5.8 350× the energy of this one
- Magna, Utah 2020 M 5.7 250× the energy of this one
- This earthquake M 4.1 about 21 tons of TNT
- Around the size people start to feel M 3.0 this one released 45× 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 39.1977, -75.4325. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Kent County, DE | 13 km (8 mi) | NNE of here | earthquakes near Kent County |
| Cumberland County, NJ | 30 km (19 mi) | WSW of here | earthquakes near Cumberland County |
| Salem County, NJ | 42 km (26 mi) | S of here | earthquakes near Salem County |
| New Castle County, DE | 46 km (28 mi) | SSE of here | earthquakes near New Castle County |
| Caroline County, MD | 50 km (31 mi) | NE of here | earthquakes near Caroline County |
| Cape May County, NJ | 52 km (32 mi) | WNW of here | earthquakes near Cape May 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.