Earthquake · reviewed by a seismologist
M 2.1ml
Earthquake near Anza, CA
No earthquake was likely felt in Anza in the 24 hours to 7:03 am PST (15:03 UTC). The last one was M 2.6, 17 km (10 mi) S, at 10:44 pm PST on 5 November 2026, estimated intensity II (weak) in town; 7 felt reports to USGS. Every earthquake near Anza
This page: a magnitude 2.1 earthquake was recorded 18 km (11 mi) east-southeast of Anza, CA, at 7:50 am PDT on 10 April 2023 (14:50 UTC), 13 km deep.
USGS: 18km ESE of Anza, CA
96 km (59 mi) NE of San Diego, CA · 30 km (19 mi) SSW of Palm Desert, CA
- When
- 7:50 am PDT on 10 April 2023 ()
- Where
- 18 km (11 mi) east-southeast of Anza, CA · earthquakes near Anza
- Magnitude
- M 2.1 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Riverside County, 53 km ENE
- Nearest mapped fault
- San Jacinto fault, under 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1312 days ago
Earthquake alerts for Anza, CA
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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 12 km (7 mi) from the epicentre. In Anza, 18 km away, the estimate is intensity II (weak). 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.
Earthquakes near other towns within 30 km: La Quinta, Borrego Springs, Palm Desert, Rancho Mirage, Indian Wells.
How big was it?
This earthquake released about 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
- Magna, Utah 2020 M 5.7 240,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 44 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 since 2016 was M 5.2 on 2016-06-10 — about 42,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 The 1968 Borrego Mountain, California Earthquake · 50 km SE of this epicentre
- 6.4 The 1954 San Jacinto Fault, California Earthquake · 44 km ESE of this epicentre
- 6.0 16km WSW of Oasis, CA · 25 km ESE of this epicentre
- 5.7 Eastern San Diego County, California · 48 km SE of this epicentre
- 5.5 8km NNE of Ocotillo Wells, CA · 48 km SE of this epicentre
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 33.4862, -116.4938. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Riverside County, CA | 53 km (33 mi) | ENE | earthquakes near Riverside County |
| San Diego County, CA | 58 km (36 mi) | SSW | earthquakes near San Diego County |
| Imperial County, CA | 117 km (73 mi) | ESE | earthquakes near Imperial County |
| Orange County, CA | 121 km (75 mi) | W | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 2.0 8km NE of Borrego Springs, CA
- 1.6 11km NNW of Julian, CA
- 1.6 9km NNW of Anza, CA
- 1.7 4km NW of Palomar Observatory, CA
- 1.7 12km SW of Salton City, CA
- 1.7 21km NNW of Borrego Springs, CA
- 1.7 0km E of Julian, CA
- 1.6 22km SSW of La Quinta, CA
- 1.9 10km NNW of Anza, CA
- 1.6 14km SE of Anza, CA
- 1.5 13km SE of Anza, CA
- 1.6 13km SE of Anza, CA
- 1.6 5km ENE of Borrego Springs, CA
- 1.7 11km NNE of Julian, CA
- 2.6 5km NW of Palomar Observatory, 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.
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.