Earthquake · automatic estimate, may change
M 1.0ml
Earthquake near Big Bear Lake, CA
No earthquake was likely felt in Big Bear Lake in the 24 hours to 12:49 am PST (08:49 UTC). The last one was M 2.6, 7 km (4 mi) NE, at 1:40 am PDT on 6 October 2026, estimated intensity III (weak) in town; 18 felt reports to USGS. Every earthquake near Big Bear Lake
This page: a magnitude 1.0 earthquake was recorded 6 km (4 mi) west-southwest of Big Bear Lake, CA, at 3:42 pm PDT on 27 September 2026 (22:42 UTC), 1.1 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 6 km WSW of Big Bear Lake, CA
21 km (13 mi) ENE of Highland, CA · 134 km (83 mi) E of Los Angeles, CA
- When
- 3:42 pm PDT on 27 September 2026 ()
- Where
- 6 km (4 mi) west-southwest of Big Bear Lake, CA · earthquakes near Big Bear Lake
- Magnitude
- M 1.0 (ml)
- Depth
- 1.1 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 95 km SW
- Nearest mapped fault
- San Andreas fault, 13 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 46 days ago
Earthquake alerts for Big Bear Lake, 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 it was probably too small to be felt, even directly above it. 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: Big Bear City, Running Springs, Lake Arrowhead, Yucaipa, Mentone, Highland.
How big was it?
This earthquake released about 1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 15,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 10,000,000× the energy of this one
- Around the size people start to feel M 3.0 930× the energy of this one
- This earthquake M 1.0 about 1 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 4.5 on 2018-05-08 — about 160,000 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 7.3 The 1992 Landers, California Earthquake · 49 km E of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 13 km E of this epicentre
- 6.2 3 km SE of San Bernardino, California · 30 km WSW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 41 km SE of this epicentre
- 5.6 7km ENE of Running Springs, CA · 7 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 34.2143, -116.9712. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 95 km (59 mi) | SW | earthquakes near Orange County |
| San Bernardino County, CA | 102 km (63 mi) | NE | earthquakes near San Bernardino County |
| Riverside County, CA | 104 km (65 mi) | ESE | earthquakes near Riverside County |
| Los Angeles County, CA | 119 km (74 mi) | W | earthquakes near Los Angeles County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 0.7 9 km S of Big Bear Lake, CA
- 0.6 4 km SE of Loma Linda, CA
- 0.8 2 km S of Loma Linda, CA
- 0.9 12 km SSE of Big Bear Lake, CA
- 1.3 9 km N of Cabazon, CA
- 2.1 4 km N of Fontana, CA
- 1.0 5 km SE of Lytle Creek, CA
- 1.1 4 km SE of Loma Linda, CA
- 0.5 5 km N of Big Bear City, CA
- 2.6 4 km NNW of Big Bear City, CA
- 0.9 4 km NE of Beaumont, CA
- 1.7 8 km NNE of Cabazon, CA
- 1.3 9 km NNE of Cabazon, CA
- 0.9 4 km SSW of Redlands, CA
- 1.4 5 km SSW of Redlands, 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.