QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

1km NNW of Pleasant Hill, CA

· 11 km deep · released about 32 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 11 kmSolano County 36 kmAlameda County 37 kmMarin County 60 kmNapa County 65 kmSan Mateo County 66 kmSan Joaquin County 70 kmYolo County 81 kmSacramento County 84 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 2.0 (md)
Depth
11 km below the surface
Felt
12 reports · strongest reported intensity III
Nearest
Contra Costa County, 11 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1866 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 32 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 470,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 330,000× the energy of this one
  3. Around the size people start to feel M 3.0 30× the energy of this one
  4. This earthquake M 2.0 about 32 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 37.9590, -122.0680. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 11 km (7 mi) WNW of here earthquakes near Contra Costa County
Solano County, CA 36 km (22 mi) SSW of here earthquakes near Solano County
Alameda County, CA 37 km (23 mi) NNW of here earthquakes near Alameda County
Marin County, CA 60 km (37 mi) E of here earthquakes near Marin County
Napa County, CA 65 km (40 mi) SSE of here earthquakes near Napa County
San Mateo County, CA 66 km (41 mi) NNE of here earthquakes near San Mateo 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. 1.6 1km SSE of San Ramon, CA
  2. 1.5 2km SW of San Francisco Zoo, CA
  3. 2.0 9km SW of Brentwood, CA
  4. 1.6 4km ENE of Burlingame, CA
  5. 1.6 1km SW of Alamo, CA
  6. 2.0 4km ENE of El Sobrante, CA
  7. 2.8 4km ENE of El Sobrante, CA
  8. 2.1 4km ENE of El Sobrante, CA
  9. 1.5 3km SSW of Clayton, CA
  10. 1.9 1km S of San Ramon, CA
  11. 1.6 5km SW of Clayton, CA
  12. 1.6 6km E of Vallejo, CA
  13. 2.1 3km WNW of Crockett, CA
  14. 1.6 4km SSW of San Francisco Zoo, CA
  15. 2.1 4km WSW of Alamo, 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 4.5 on 2019-10-15 — it released about 4,600 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.