Earthquake · reviewed by a seismologist
M 2.7md
Earthquake near Crockett, CA
No earthquake was likely felt in Crockett in the 24 hours to 6:00 am PST (14:00 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 2.7 earthquake was recorded in Crockett, CA, at 12:17 am PDT on 5 September 2020 (07:17 UTC), 10 km deep. 611 people have reported feeling it to USGS.
USGS: 2km SSE of Crockett, CA
9 km (6 mi) SE of Vallejo, CA · 35 km (21 mi) NNE of San Francisco, CA
- When
- 12:17 am PDT on 5 September 2020 ()
- Where
- in Crockett, CA · earthquakes near Crockett
- Magnitude
- M 2.7 (md)
- Depth
- 10 km below the surface
- Felt
- 611 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 26 km ESE
- Nearest mapped fault
- Concord fault, 12 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 1872 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 23 km (14 mi) from the epicentre. 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 in town, intensity III · Benicia 4 km, intensity III · Martinez 7 km, intensity III · Hercules 8 km, intensity III · Vallejo 9 km, intensity III · Pinole 9 km, intensity III · Pacheco 13 km, intensity II · San Pablo 15 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 390 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 39,000× the energy of this one
- Magna, Utah 2020 M 5.7 28,000× the energy of this one
- Around the size people start to feel M 3.0 2.5× the energy of this one
- This earthquake M 2.7 about 390 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 380 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 7.9 The 1906 San Francisco, California Earthquake · 44 km SW of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 22 km NNW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 44 km ESE of this epicentre
- 5.4 South of Elmira, California · 39 km NE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 48 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 38.0395, -122.2047. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 26 km (16 mi) | ESE | earthquakes near Contra Costa County |
| Solano County, CA | 34 km (21 mi) | NE | earthquakes near Solano County |
| Marin County, CA | 47 km (29 mi) | W | earthquakes near Marin County |
| Alameda County, CA | 51 km (31 mi) | SSE | earthquakes near Alameda County |
| Napa County, CA | 53 km (33 mi) | NNW | earthquakes near Napa County |
| San Mateo County, CA | 71 km (44 mi) | SSW | earthquakes near San Mateo 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.
- 3.3 7km S of Muir Beach, CA
- 2.6 0km E of San Pablo, CA
- 2.6 1km WNW of Bay Point, CA
- 1.9 2km NNE of San Leandro, CA
- 1.6 2km NW of Bay Point, CA
- 1.7 2km E of Berkeley, CA
- 1.8 2km SE of Pacheco, CA
- 1.6 3km ESE of Pacheco, CA
- 2.5 0km SE of Rollingwood, CA
- 1.6 0km SE of Rollingwood, CA
- 2.1 4km ESE of Hayward, CA
- 2.1 4km WNW of Dublin, CA
- 1.7 4km WNW of Dublin, CA
- 1.7 4km WNW of Dublin, CA
- 2.3 4km WNW of Dublin, 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.