Earthquake · reviewed by a seismologist
M 2.3ml
4km N of Delta, B.C., MX
Yes. A magnitude 2.3 earthquake was recorded 4km N of Delta, B.C., MX, 65 km (40 mi) WSW of Yuma, AZ, at 1:07 pm MST on 17 July 2021 (20:07 UTC), 16 km deep.
65 km (40 mi) WSW of Yuma, AZ
- When
- Magnitude
- M 2.3 (ml)
- Depth
- 16 km below the surface
- Felt
- no reports yet
- Nearest
- Imperial County, 74 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1941 days ago
Earthquake alerts for San Luis, AZ
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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 11 km (7 mi) from the epicentre. 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.
How big was it?
This earthquake released about 72 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 210,000× the energy of this one
- Magna, Utah 2020 M 5.7 150,000× the energy of this one
- Around the size people start to feel M 3.0 13× the energy of this one
- This earthquake M 2.3 about 72 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
The largest earthquake within 50 km in our catalogue was M 4.8 on 2018-11-19 — about 7,200 times the energy of this one.
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 32.3883, -115.1968. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Imperial County, CA | 74 km (46 mi) | NNW | earthquakes near Imperial County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 1.8 8km NNW of Delta, B.C., MX
- 2.0 9km W of Progreso, B.C., MX
- 1.9 7km SW of Holtville, CA
- 2.8 9km WNW of Alberto Oviedo Mota, B.C., MX
- 2.2 6km ENE of Progreso, B.C., MX
- 2.3 17km SSW of Puebla, B.C., MX
- 1.5 6km ENE of Calexico, CA
- 2.1 13km WSW of Delta, B.C., MX
- 2.1 10km E of Puebla, B.C., MX
- 1.7 8km SW of Holtville, CA
- 2.2 7km SW of Holtville, CA
- 2.2 7km SW of Holtville, CA
- 1.7 8km SW of Holtville, CA
- 2.2 2km W of Delta, B.C., MX
- 3.7 7km N of Delta, B.C., MX
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.