Earthquake · reviewed by a seismologist
M 0.4ml
Earthquake near Idyllwild, CA
USGS: 9 km SSW of Idyllwild, CA
23 km (14 mi) ESE of Hemet, CA · 101 km (63 mi) NNE of San Diego, CA
- When
- 6:02 am PDT on 28 September 2026 ()
- Where
- 9 km (6 mi) SSW of Idyllwild, CA · earthquakes near Idyllwild
- Magnitude
- M 0.4 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Riverside County, 71 km E
- Nearest mapped fault
- San Jacinto fault, 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 4 days ago
A magnitude 0.4 earthquake was recorded 9 km (6 mi) SSW of Idyllwild, CA, at 6:02 am PDT on 28 September 2026 (13:02 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Idyllwild-Pine Cove, Anza, Valle Vista, East Hemet, Hemet, San Jacinto.
How big was it?
This earthquake released about 0.12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 130,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 89,000,000× the energy of this one
- Around the size people start to feel M 3.0 7,900× the energy of this one
- This earthquake M 0.4 about 0.12 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 15,000,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 22 km WNW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 40 km NNE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 39 km SE of this epicentre
- 5.3 4km NNE of Desert Hot Springs, CA · 45 km NE of this epicentre
- 5.3 6km SSE of Hemet, CA · 17 km WNW 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 33.6655, -116.7647. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Riverside County, CA | 71 km (44 mi) | E | earthquakes near Riverside County |
| San Diego County, CA | 71 km (44 mi) | S | earthquakes near San Diego County |
| Orange County, CA | 94 km (58 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.
- 0.6 21 km SW of La Quinta, CA
- 0.1 21 km ESE of Anza, CA
- 0.3 3 km NE of Aguanga, CA
- 1.3 21 km ESE of Anza, CA
- 3.1 20 km ESE of Anza, CA
- 0.7 22 km ESE of Anza, CA
- 0.5 6 km ENE of Anza, CA
- 0.7 6 km ENE of Anza, CA
- 0.1 7 km WSW of Anza, CA
- 0.4 7 km SW of Anza, CA
- 1.0 18 km N of Borrego Springs, CA
- 0.8 22 km ESE of Anza, CA
- 0.2 9 km SW of Idyllwild, CA
- 0.1 4 km WSW of Anza, CA
- 1.4 8 km SW of Anza, 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.