Earthquake · reviewed by a seismologist
M -0.1ml
Earthquake near Anza, CA
USGS: 15 km SSE of Anza, CA
82 km (51 mi) NE of San Diego, CA · 44 km (27 mi) SW of Palm Desert, CA
- When
- 7:48 pm PDT on 28 September 2026 ()
- Where
- 15 km (9 mi) SSE of Anza, CA · earthquakes near Anza
- Magnitude
- M -0.1 (ml)
- Depth
- 6.5 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 46 km SSW
- Nearest mapped fault
- San Jacinto fault, 11 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 3 days ago
A magnitude -0.1 earthquake was recorded 15 km (9 mi) SSE of Anza, CA, at 7:48 pm PDT on 28 September 2026 (02:48 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Aguanga.
How big was it?
This earthquake released about 0.025 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 0.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 600,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 420,000,000× the energy of this one
- Around the size people start to feel M 3.0 38,000× the energy of this one
- This earthquake M -0.1 about 0.025 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 2025-04-14 — about 78,000,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 49 km NW of this epicentre
- 6.0 16km WSW of Oasis, CA · 36 km E of this epicentre
- 5.5 1km ENE of Borrego Springs, CA · 32 km SE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 15 km E of this epicentre
- 5.3 6km SSE of Hemet, CA · 42 km NW 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 33.4208, -116.6408. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 46 km (29 mi) | SSW | earthquakes near San Diego County |
| Riverside County, CA | 68 km (43 mi) | ENE | earthquakes near Riverside County |
| Orange County, CA | 109 km (68 mi) | WNW | earthquakes near Orange County |
| Imperial County, CA | 127 km (79 mi) | ESE | earthquakes near Imperial 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.
- 0.5 16 km ESE of Anza, CA
- 0.7 4 km NNW of Anza, CA
- 0.5 9 km WNW of Anza, CA
- 0.6 8 km S of Idyllwild, CA
- 0.5 9 km WNW of Anza, CA
- 0.6 9 km WNW of Anza, CA
- 2.0 9 km WNW of Anza, CA
- 0.3 9 km WNW of Anza, CA
- 0.3 12 km NE of Julian, CA
- 0.5 8 km E of Anza, CA
- 0.4 12 km W of Anza, CA
- 0.8 15 km SSW of Borrego Springs, CA
- 0.8 3 km WSW of Borrego Springs, CA
- 1.2 14 km ENE of Temecula, CA
- 1.6 14 km ENE of Temecula, 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.