QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

1 km ENE of Pittsburg, CA

· 19 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 14 kmSolano County 27 kmAlameda County 43 kmSan Joaquin County 54 kmNapa County 66 kmSacramento County 66 kmYolo County 72 kmMarin County 76 kmSan Mateo County 81 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
1 report · strongest reported intensity I
Nearest
Contra Costa County, 14 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1126 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× 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 38.0298, -121.8780. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 14 km (9 mi) NNE of here earthquakes near Contra Costa County
Solano County, CA 27 km (17 mi) SSE of here earthquakes near Solano County
Alameda County, CA 43 km (27 mi) N of here earthquakes near Alameda County
San Joaquin County, CA 54 km (34 mi) WNW of here earthquakes near San Joaquin County
Napa County, CA 66 km (41 mi) SE of here earthquakes near Napa County
Sacramento County, CA 66 km (41 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

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

  1. 1.5 5 km E of Vallejo, CA
  2. 1.7 2 km ESE of Oakland, CA
  3. 1.6 6 km S of Isleton, CA
  4. 1.7 5 km S of San Ramon, CA
  5. 1.8 5 km S of San Ramon, CA
  6. 1.5 5 km S of San Ramon, CA
  7. 1.7 8 km SSW of Martinez, CA
  8. 2.2 5 km S of San Ramon, CA
  9. 1.7 4 km ENE of Discovery Bay, CA
  10. 1.7 5 km WNW of Byron, CA
  11. 2.1 3 km N of San Lorenzo, CA
  12. 1.5 8 km SSW of Livermore, CA
  13. 2.0 2 km NNE of Pleasant Hill, CA
  14. 1.6 2 km ENE of San Leandro, CA
  15. 1.8 1 km E of San Leandro, 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 11,000 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.