Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Crockett, CA
No earthquake was likely felt in Crockett in the 24 hours to 3:53 am PST (11:53 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 1.7 earthquake was recorded in Crockett, CA, at 2:34 am PST on 17 November 2018 (10:34 UTC), 10 km deep.
USGS: 2km NNW of Crockett, CA
6 km (4 mi) SE of Vallejo, CA · 36 km (23 mi) NNE of San Francisco, CA
- When
- 2:34 am PST on 17 November 2018 ()
- Where
- in Crockett, CA · earthquakes near Crockett
- Magnitude
- M 1.7 (md)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- 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 2915 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 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 7 km (4 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 II · Vallejo 5 km, intensity II · Benicia 6 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 9.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 99× the energy of this one
- This earthquake M 1.7 about 9.6 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 2018-01-04 — about 12,000 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 · 47 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 · 48 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 38.0672, -122.2205. 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 (29 mi) | W | earthquakes near Marin County |
| Napa County, CA | 50 km (31 mi) | N | earthquakes near Napa County |
| Alameda County, CA | 54 km (34 mi) | SSE | earthquakes near Alameda County |
| Yolo County, CA | 74 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
52 earthquakes have been recorded within 50 km since this one.
- 1.9 6km W of Yountville, CA
- 2.7 3km NNE of San Ramon, CA
- 2.4 1km N of Vine Hill, CA
- 2.8 3km NE of Oakland, CA
- 2.0 1km NNE of Pacheco, CA
- 1.5 3km ESE of Berkeley, CA
- 1.9 2km ENE of Berkeley, CA
- 2.0 12km NE of Napa, CA
- 2.0 10km ENE of Blackhawk, CA
- 1.9 10km ENE of Blackhawk, CA
- 2.2 10km ENE of Blackhawk, CA
- 1.8 8km W of Yountville, CA
- 3.7 6km SSW of Yountville, CA
- 2.1 1km N of Pacheco, CA
- 2.0 1km N of Pacheco, 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.