Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Brentwood, CA
No earthquake was likely felt in Brentwood in the 24 hours to 9:54 pm PST (05:54 UTC). The last one was M 3.0, 12 km (7 mi) WSW, at 6:47 am PDT on 14 September 2026, estimated intensity II (weak) in town; 52 felt reports to USGS. Every earthquake near Brentwood
This page: a magnitude 2.1 earthquake was recorded 11 km (7 mi) southwest of Brentwood, CA, at 9:30 pm PDT on 29 October 2022 (04:30 UTC), 17 km deep. 1 person has reported feeling it to USGS.
USGS: 9km SSW of Brentwood, CA
10 km (6 mi) SSW of Brentwood, CA · 62 km (39 mi) N of San Jose, CA
- When
- 9:30 pm PDT on 29 October 2022 ()
- Where
- 11 km (7 mi) southwest of Brentwood, CA · earthquakes near Brentwood
- Magnitude
- M 2.1 (md)
- Depth
- 17 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Contra Costa County, 18 km WNW
- Nearest mapped fault
- Greenville fault, 4 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 1468 days ago
Earthquake alerts for Brentwood, 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 4 km (2 mi) from the epicentre. In Brentwood, 11 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: Byron, Blackhawk, Knightsen, Discovery Bay, Oakley, Diablo.
How big was it?
This earthquake released about 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
- Magna, Utah 2020 M 5.7 260,000× the energy of this one
- Around the size people start to feel M 3.0 23× the energy of this one
- This earthquake M 2.1 about 41 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 2019-10-15 — about 3,600 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 5.8 The 1980 Livermore, California Earthquake · 2 km S of this epicentre
- 5.7 15 km NE of East Foothills, California · 42 km S of this epicentre
- 5.5 6 km NNE of East Foothills, California · 47 km S of this epicentre
- 5.4 9 km NE of Livermore, California · 13 km SSE of this epicentre
- 5.1 11 km E of Blackhawk, California · 5 km S 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 37.8552, -121.7677. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 18 km (11 mi) | WNW | earthquakes near Contra Costa County |
| Alameda County, CA | 26 km (16 mi) | SSW | earthquakes near Alameda County |
| San Joaquin County, CA | 44 km (28 mi) | ENE | earthquakes near San Joaquin County |
| Solano County, CA | 48 km (30 mi) | NNW | earthquakes near Solano County |
| Santa Clara County, CA | 71 km (44 mi) | S | earthquakes near Santa Clara County |
| San Mateo County, CA | 72 km (45 mi) | SW | earthquakes near San Mateo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.6 8km SE of Sunol, CA
- 1.7 2km N of San Leandro, CA
- 1.5 8km SSW of Livermore, CA
- 1.5 8km SSW of Brentwood, CA
- 2.0 2km NE of Danville, CA
- 1.9 2km W of Diablo, CA
- 1.9 2km NE of Danville, CA
- 1.7 9km NE of Blackhawk, CA
- 1.5 3km ESE of San Ramon, CA
- 2.7 3km NE of San Leandro, CA
- 1.5 3km E of Oakland, CA
- 2.5 8km NNE of Alum Rock, CA
- 2.0 3km NNE of Fremont, CA
- 1.5 2km NNE of Pleasant Hill, CA
- 1.7 7km SSW of Antioch, 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.