Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Running Springs, CA
No earthquake was likely felt in Running Springs in the 24 hours to 3:25 pm PST (23:25 UTC). The last one was M 2.0, 13 km (8 mi) WSW, at 3:40 pm PDT on 22 September 2026, estimated intensity II (weak) in town; 14 felt reports to USGS. Every earthquake near Running Springs
This page: a magnitude 1.8 earthquake was recorded 10 km (6 mi) north-northeast of Running Springs, CA, at 4:12 pm PST on 11 January 2018 (00:12 UTC), 7.3 km deep.
USGS: 10km NNE of Running Springs, CA
22 km (14 mi) NNE of Highland, CA · 128 km (80 mi) ENE of Los Angeles, CA
- When
- 4:12 pm PST on 11 January 2018 ()
- Where
- 10 km (6 mi) north-northeast of Running Springs, CA · earthquakes near Running Springs
- Magnitude
- M 1.8 (ml)
- Depth
- 7.3 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 95 km SW
- Nearest mapped fault
- Cleghorn fault, 14 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 3226 days ago
Earthquake alerts for Running Springs, 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 11 km (7 mi) from the epicentre. In Running Springs, 10 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: Lake Arrowhead, Big Bear Lake, Lucerne Valley, Big Bear City, Crestline, Highland.
How big was it?
This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 810,000× the energy of this one
- Around the size people start to feel M 3.0 72× the energy of this one
- This earthquake M 1.8 about 13 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 4.4 on 2016-01-06 — about 8,800 times the energy of this one.
Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 The 1992 Big Bear, California Earthquake · 23 km ESE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 29 km SW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 5 km SSE of this epicentre
- 5.5 11km SSE of Big Bear Lake, California · 23 km SE of this epicentre
- 5.3 Near San Bernardino, California · 10 km SSW 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 34.2872, -117.0565. 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 |
| Los Angeles County, CA | 111 km (69 mi) | W | earthquakes near Los Angeles County |
| Riverside County, CA | 115 km (72 mi) | ESE | earthquakes near Riverside County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.8 16km NW of Morongo Valley, CA
- 1.8 6km ENE of Yucaipa, CA
- 1.9 3km NNW of Beaumont, CA
- 1.8 11km ENE of Yucaipa, CA
- 1.8 5km SSE of Banning, CA
- 1.6 2km SE of Fontana, CA
- 1.6 7km S of Redlands, CA
- 1.7 4km ESE of Loma Linda, CA
- 1.8 5km S of Redlands, CA
- 1.6 2km N of Colton, CA
- 1.9 13km NNE of Banning, CA
- 2.0 5km SSW of Lytle Creek, CA
- 1.6 3km S of Mentone, CA
- 1.5 4km N of Cabazon, CA
- 1.6 7km SSW of Lytle Creek, 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.