Earthquake · reviewed by a seismologist
M 3.3mw
Earthquake near Crockett, CA
No earthquake was likely felt in Crockett in the 24 hours to 3:19 am PST (11:19 UTC). The last one was M 1.8, 10 km (6 mi) NNE, at 11:09 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Crockett
This page: a magnitude 3.3 earthquake was recorded 2 km (1 mi) north-northwest of Crockett, CA, at 5:27 pm PDT on 1 September 2018 (00:27 UTC), 8.0 km deep. 1,197 people have reported feeling it to USGS.
USGS: 2km NNW of Crockett, CA
5 km (3 mi) SE of Vallejo, CA
- When
- 5:27 pm PDT on 1 September 2018 ()
- Where
- 2 km (1 mi) north-northwest of Crockett, CA · earthquakes near Crockett
- Magnitude
- M 3.3 (mw)
- Depth
- 8.0 km below the surface
- Felt
- 1,197 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Contra Costa County, 29 km SE
- Nearest mapped fault
- Green Valley fault, 11 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 1426 days ago
Earthquake alerts for Crockett, CA
Get a notification in this browser when USGS records an earthquake near Crockett, CA. No account or email needed.
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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 51 km (32 mi) from the epicentre. In Crockett, 2 km away, the estimate is intensity III (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.
Likely felt in: Crockett 2 km, intensity III · Vallejo 5 km, intensity III · Benicia 6 km, intensity III · Hercules 8 km, intensity III · Pinole 10 km, intensity III · Martinez 10 km, intensity III · San Pablo 16 km, intensity III · Pacheco 16 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 130,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 5,800× the energy of this one
- Magna, Utah 2020 M 5.7 4,100× the energy of this one
- This earthquake M 3.3 about 1.3 tons of TNT
- Around the size people start to feel M 3.0 this one released 2.7× more
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 2018-01-04 — about 43 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 46 km SW of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 18 km NNW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 48 km ESE of this epicentre
- 5.4 South of Elmira, California · 38 km NE of this epicentre
- 5.1 11 km E of Blackhawk, California · 49 km SE 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 38.0713, -122.2258. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 29 km (18 mi) | SE | earthquakes near Contra Costa County |
| Solano County, CA | 33 km (21 mi) | NE | earthquakes near Solano County |
| Marin County, CA | 46 km (28 mi) | W | earthquakes near Marin County |
| Napa County, CA | 49 km (31 mi) | N | earthquakes near Napa County |
| Alameda County, CA | 55 km (34 mi) | SSE | earthquakes near Alameda County |
| Yolo County, CA | 73 km (46 mi) | NNE | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 2.0 3km ENE of San Leandro, CA
- 1.6 5km E of San Ramon, CA
- 1.8 6km SSW of Yountville, CA
- 1.6 8km SW of Napa, CA
- 2.4 2km NW of Pittsburg, CA
- 1.5 2km ENE of Hayward, CA
- 2.5 1km WNW of Crockett, CA
- 2.4 4km WSW of Glen Ellen, CA
- 1.8 9km ENE of Napa, CA
- 2.3 3km E of Pacheco, CA
- 1.6 1km E of San Leandro, CA
- 2.3 3km ENE of Oakland, CA
- 1.6 1km ESE of East Richmond Heights, CA
- 2.5 3km ENE of Oakland, CA
- 1.7 2km NNW of Crockett, 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.