QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11km NNW of Pittsburg, CA

· 19 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 16 kmContra Costa County 23 kmAlameda County 53 kmNapa County 56 kmSan Joaquin County 60 kmSacramento County 61 kmYolo County 62 kmMarin County 73 kmSan Mateo County 89 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
19 km below the surface
Felt
no reports yet
Nearest
Solano County, 16 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2312 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 38.1255, -121.9120. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 16 km (10 mi) S of here earthquakes near Solano County
Contra Costa County, CA 23 km (14 mi) N of here earthquakes near Contra Costa County
Alameda County, CA 53 km (33 mi) N of here earthquakes near Alameda County
Napa County, CA 56 km (35 mi) SE of here earthquakes near Napa County
San Joaquin County, CA 60 km (37 mi) WNW of here earthquakes near San Joaquin County
Sacramento County, CA 61 km (38 mi) SW of here earthquakes near Sacramento 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. 1.5 4km SSE of Brentwood, CA
  2. 1.7 2km SW of Clayton, CA
  3. 1.7 6km W of Brentwood, CA
  4. 2.3 3km ENE of San Ramon, CA
  5. 1.6 9km WSW of Mountain House, CA
  6. 2.5 2km ENE of San Leandro, CA
  7. 2.6 2km ENE of Pleasant Hill, CA
  8. 2.4 2km E of Berkeley, CA
  9. 2.6 4km ESE of Berkeley, CA
  10. 2.1 4km ESE of Berkeley, CA
  11. 1.7 1km SW of Diablo, CA
  12. 1.6 3km SW of Clayton, CA
  13. 2.1 8km WSW of Mountain House, CA
  14. 1.6 3km ENE of Oakland, CA
  15. 1.6 8km WSW of Mountain House, 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 9,800 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.