Earthquake · reviewed by a seismologist
M 4.1mw
13km WNW of Calipatria, CA
- When
- Magnitude
- M 4.1 (mw)
- Depth
- 5.3 km below the surface
- Felt
- 35 reports · strongest reported intensity VI
- Measured shaking
- intensity V (ShakeMap)
- USGS impact alert
- green
- Nearest
- Imperial County, 30 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1848 days ago
This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 35 people have reported feeling it to USGS.
How big was it?
This earthquake released about 20 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 8,500× the energy of this one
- Mineral, Virginia 2011 M 5.8 380× the energy of this one
- Magna, Utah 2020 M 5.7 270× the energy of this one
- This earthquake M 4.1 about 20 tons of TNT
- Around the size people start to feel M 3.0 this one released 42× 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 33.1667, -115.6400. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Imperial County, CA | 30 km (19 mi) | WNW of here | earthquakes near Imperial County |
| Riverside County, CA | 71 km (44 mi) | SSE of here | earthquakes near Riverside County |
| San Diego County, CA | 107 km (67 mi) | E of here | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.5 10km WNW of Calipatria, CA
- 1.9 12km WNW of Calipatria, CA
- 1.5 3km SSW of Niland, CA
- 1.7 11km W of Calipatria, CA
- 1.9 8km WNW of Calipatria, CA
- 1.8 3km NW of Niland, CA
- 1.9 12km WSW of Niland, CA
- 1.9 11km N of Westmorland, CA
- 1.5 12km W of Calipatria, CA
- 1.5 11km WNW of Calipatria, CA
- 1.7 13km WNW of Calipatria, CA
- 2.1 11km N of Westmorland, CA
- 1.6 13km WNW of Calipatria, CA
- 2.5 11km W of Calipatria, CA
- 1.5 11km WSW of Niland, CA
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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.3 on 2021-06-05 — it released about 57 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.