QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

11km SW of Mountain House, CA

· 17 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 27 kmContra Costa County 38 kmSan Joaquin County 40 kmSanta Clara County 54 kmStanislaus County 56 kmSolano County 69 kmSan Mateo County 74 kmSanta Cruz County 84 kmSacramento County 87 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 1.5 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Alameda County, 27 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1781 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 37.7017, -121.6163. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 27 km (17 mi) ENE of here earthquakes near Alameda County
Contra Costa County, CA 38 km (24 mi) SE of here earthquakes near Contra Costa County
San Joaquin County, CA 40 km (25 mi) SW of here earthquakes near San Joaquin County
Santa Clara County, CA 54 km (33 mi) N of here earthquakes near Santa Clara County
Stanislaus County, CA 56 km (35 mi) WNW of here earthquakes near Stanislaus County
Solano County, CA 69 km (43 mi) SSE of here earthquakes near Solano 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. 1.8 5km NW of Pittsburg, CA
  2. 3.1 2km ENE of San Leandro, CA
  3. 2.2 3km NNW of Diablo, CA
  4. 1.9 16km E of Seven Trees, CA
  5. 1.5 12km SW of Mountain House, CA
  6. 1.6 12km SW of Mountain House, CA
  7. 1.6 1km NE of Byron, CA
  8. 1.9 6km WNW of Dublin, CA
  9. 2.2 5km WNW of Dublin, CA
  10. 1.9 8km E of Fremont, CA
  11. 1.6 2km NNE of San Ramon, CA
  12. 2.4 6km N of Diablo, CA
  13. 2.1 11km SSW of Brentwood, CA
  14. 1.6 1km NE of San Ramon, CA
  15. 1.5 2km NE of Union City, 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 24,000 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.