QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near El Cerrito, CA

No earthquake was likely felt in El Cerrito in the 24 hours to 4:01 am PST (12:01 UTC). The last one was M 2.6, 8 km (5 mi) SE, at 6:23 pm PST on 1 November 2026, estimated intensity II (weak) in town; 114 felt reports to USGS. Every earthquake near El Cerrito

This page: a magnitude 2.1 earthquake was recorded in El Cerrito, CA, at 4:37 am PST on 1 March 2023 (12:37 UTC), 3.8 km deep. 51 people have reported feeling it to USGS.

USGS: 1km N of El Cerrito, CA

19 km (12 mi) NNE of San Francisco, CA · 5 km (3 mi) SE of Richmond, CA

4:37 am PST, Mar 1, 2023 · · 3.8 km deep · released about 44 lb of TNT

Every earthquake near El Cerrito Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 32 kmMarin County 41 kmAlameda County 47 kmSolano County 50 kmSan Mateo County 57 kmNapa County 65 kmSan Francisco County 67 kmSonoma County 86 kmSan Joaquin County 91 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:37 am PST on 1 March 2023 ()
Where
in El Cerrito, CA · earthquakes near El Cerrito
Magnitude
M 2.1 (md)
Depth
3.8 km below the surface
Felt
51 reports · strongest reported intensity III
Nearest
Contra Costa County, 32 km E
Nearest mapped fault
Hayward fault, 8 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 1348 days ago

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 17 km (11 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: El Cerrito in town, intensity II · Richmond 3 km, intensity II · San Pablo 5 km, intensity II · Berkeley 7 km, intensity II · Pinole 9 km, intensity II · Hercules 10 km, intensity II · Orinda 13 km, intensity II · Oakland 14 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 44 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.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 3,300 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 7.9 The 1906 San Francisco, California Earthquake · 29 km SW of this epicentre
  2. 6.0 The 2014 South Napa, California Earthquake · 32 km N of this epicentre
  3. 5.8 The 1980 Livermore, California Earthquake · 49 km E of this epicentre
  4. 5.3 The 1957 San Francisco, California Earthquake · 32 km SSW of this epicentre
  5. 5.1 11 km E of Blackhawk, California · 49 km ESE 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 37.9247, -122.3108. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Contra Costa County, CA 32 km (20 mi) E earthquakes near Contra Costa County
Marin County, CA 41 km (25 mi) WNW earthquakes near Marin County
Alameda County, CA 47 km (29 mi) SE earthquakes near Alameda County
Solano County, CA 50 km (31 mi) NE earthquakes near Solano County
San Mateo County, CA 57 km (35 mi) S earthquakes near San Mateo County
Napa County, CA 65 km (40 mi) N earthquakes near Napa County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

56 earthquakes have been recorded within 50 km since this one.

  1. 2.2 5km WSW of San Francisco Zoo, CA
  2. 1.7 4km SW of Vallejo, CA
  3. 2.2 4km E of Walnut Creek, CA
  4. 1.7 5km E of Walnut Creek, CA
  5. 1.8 4km SSE of Highlands-Baywood Park, CA
  6. 2.1 6km NNE of San Leandro, CA
  7. 2.2 6km SSW of Antioch, CA
  8. 1.9 1km SSE of Diablo, CA
  9. 1.6 4km NNW of Diablo, CA
  10. 1.6 3km N of Danville, CA
  11. 1.6 2km E of Union City, CA
  12. 2.2 2km ENE of Union City, CA
  13. 1.5 8km SSW of Antioch, CA
  14. 1.6 2km S of Blackhawk, CA
  15. 2.0 2km S of Blackhawk, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.