Earthquake · reviewed by a seismologist
M 3.3ml
18km W of Delta, B.C., MX
Yes. A magnitude 3.3 earthquake was recorded 18km W of Delta, B.C., MX, 83 km (52 mi) WSW of Yuma, AZ, at 2:22 pm PST on 23 December 2020 (22:22 UTC), 15 km deep. 1 person has reported feeling it to USGS.
83 km (52 mi) WSW of Yuma, AZ
- When
- Magnitude
- M 3.3 (ml)
- Depth
- 15 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Imperial County, 78 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2077 days ago
Earthquake alerts for Calexico, CA
Get a notification in this browser when USGS records an earthquake near Calexico, CA. No account or email needed.
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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 52 km (32 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.
Likely felt in: Calexico 40 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 110,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 4,900× the energy of this one
- Magna, Utah 2020 M 5.7 3,500× the energy of this one
- This earthquake M 3.3 about 1.5 tons of TNT
- Around the size people start to feel M 3.0 this one released 3.2× 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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.8 on 2018-11-19 — about 170 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 32.3358, -115.3795. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Imperial County, CA | 78 km (49 mi) | N | earthquakes near Imperial County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
35 earthquakes have been recorded within 50 km since this one.
- 2.2 10km NW of Progreso, B.C., MX
- 1.7 6km E of Puebla, B.C., MX
- 1.7 11km SE of Puebla, B.C., MX
- 2.0 11km SE of Puebla, B.C., MX
- 2.2 8km ESE of Puebla, B.C., MX
- 2.5 16km WNW of Progreso, B.C., MX
- 2.3 8km S of Progreso, B.C., MX
- 2.0 7km E of Puebla, B.C., MX
- 1.8 8km ESE of Puebla, B.C., MX
- 1.6 15km WNW of Progreso, B.C., MX
- 1.6 15km WNW of Progreso, B.C., MX
- 2.2 15km WNW of Progreso, B.C., MX
- 2.3 16km WNW of Progreso, B.C., MX
- 2.3 7km SSE of Mexicali, B.C., MX
- 2.2 3km NW 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.