Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near French Camp, CA
No earthquake was likely felt in French Camp in the 24 hours to 9:24 pm PST (05:24 UTC). The last one was M 3.5, 54 km (34 mi) SSW, at 7:21 am PDT on 27 September 2026, estimated intensity II (weak) in town; 8 felt reports to USGS. Every earthquake near French Camp
This page: a magnitude 1.8 earthquake was recorded 6 km (4 mi) west of French Camp, CA, at 7:25 am PST on 4 February 2018 (15:25 UTC), 20 km deep.
USGS: 6km W of French Camp, CA
12 km (7 mi) SSW of Stockton, CA
- When
- 7:25 am PST on 4 February 2018 ()
- Where
- 6 km (4 mi) west of French Camp, CA · earthquakes near French Camp
- Magnitude
- M 1.8 (md)
- Depth
- 20 km below the surface
- Felt
- no reports yet
- Nearest
- San Joaquin County, 9 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3201 days ago
Earthquake alerts for French Camp, CA
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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. In French Camp, 6 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: Lathrop, Kennedy, Stockton, August, Garden Acres, Manteca.
How big was it?
This earthquake released about 16 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 5.8 930,000× the energy of this one
- Magna, Utah 2020 M 5.7 660,000× the energy of this one
- Around the size people start to feel M 3.0 59× the energy of this one
- This earthquake M 1.8 about 16 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 5.8 The 1980 Livermore, California Earthquake · 38 km W of this epicentre
- 5.4 9 km NE of Livermore, California · 35 km WSW of this epicentre
- 5.1 11 km E of Blackhawk, California · 39 km W 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 37.8765, -121.3430. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Joaquin County, CA | 9 km (6 mi) | NE | earthquakes near San Joaquin County |
| Stanislaus County, CA | 46 km (29 mi) | SE | earthquakes near Stanislaus County |
| Contra Costa County, CA | 54 km (33 mi) | W | earthquakes near Contra Costa County |
| Alameda County, CA | 56 km (35 mi) | WSW | earthquakes near Alameda County |
| Sacramento County, CA | 64 km (40 mi) | N | earthquakes near Sacramento County |
| Solano County, CA | 68 km (42 mi) | NW | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
34 earthquakes have been recorded within 50 km since this one.
- 2.0 2km S of Discovery Bay, CA
- 2.1 17km ESE of Livermore, CA
- 1.9 18km SE of Livermore, CA
- 1.7 6km NE of Blackhawk, CA
- 1.6 6km WNW of Mountain House, CA
- 2.8 6km WNW of Mountain House, CA
- 1.5 16km SSE of Livermore, CA
- 2.3 16km SSE of Livermore, CA
- 1.9 18km SSE of Livermore, CA
- 1.6 9km WSW of Brentwood, CA
- 1.9 8km SE of Livermore, CA
- 1.7 17km SE of Livermore, CA
- 1.6 9km ENE of Blackhawk, CA
- 2.3 5km ESE of Blackhawk, CA
- 2.2 10km NNE of Livermore, 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.