QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

2km E of Berkeley, CA

· 9.0 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 27 kmAlameda County 39 kmMarin County 48 kmSolano County 51 kmSan Mateo County 52 kmSan Francisco County 71 kmNapa County 71 kmSan Joaquin County 86 kmSanta Clara County 88 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
Magnitude
M 1.8 (md)
Depth
9.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Contra Costa County, 27 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2752 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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.

Where

Epicentre 37.8750, -122.2510. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 27 km (17 mi) W of here earthquakes near Contra Costa County
Alameda County, CA 39 km (24 mi) NW of here earthquakes near Alameda County
Marin County, CA 48 km (30 mi) ESE of here earthquakes near Marin County
Solano County, CA 51 km (32 mi) SSW of here earthquakes near Solano County
San Mateo County, CA 52 km (32 mi) NNE of here earthquakes near San Mateo County
San Francisco County, CA 71 km (44 mi) ENE of here earthquakes near San Francisco County

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

Aftershocks so far

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

  1. 1.8 11km N of Bay Point, CA
  2. 1.5 2km SW of Clayton, CA
  3. 1.6 1km W of Concord, CA
  4. 1.6 13km SW of Byron, CA
  5. 1.8 2km SSW of Diablo, CA
  6. 1.5 2km SSW of Diablo, CA
  7. 2.1 13km WSW of Byron, CA
  8. 3.2 12km WSW of Byron, CA
  9. 4.3 12km WSW of Byron, CA
  10. 2.3 3km ESE of Berkeley, CA
  11. 1.5 3km ESE of Berkeley, CA
  12. 2.1 2km NNE of Pacifica, CA
  13. 1.9 2km SSE of Crockett, CA
  14. 1.6 4km NNW of Pacifica, CA
  15. 1.8 2km ENE of Pleasant Hill, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2018-01-04 — it released about 8,800 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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