QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

1km SSE of Pleasanton, CA

· 15 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 4 kmContra Costa County 31 kmSanta Clara County 50 kmSan Mateo County 52 kmSan Joaquin County 61 kmSolano County 69 kmSanta Cruz County 72 kmStanislaus County 77 kmMarin 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 1.5 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Alameda County, 4 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2274 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 5.7 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 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 37.6510, -121.8687. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alameda County, CA 4 km (2 mi) E of here earthquakes near Alameda County
Contra Costa County, CA 31 km (19 mi) SSE of here earthquakes near Contra Costa County
Santa Clara County, CA 50 km (31 mi) NNW of here earthquakes near Santa Clara County
San Mateo County, CA 52 km (32 mi) ENE of here earthquakes near San Mateo County
San Joaquin County, CA 61 km (38 mi) WSW of here earthquakes near San Joaquin County
Solano County, CA 69 km (43 mi) S of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 2.3 10km NE of Milpitas, CA
  2. 2.0 6km S of Livermore, CA
  3. 2.2 7km S of Livermore, CA
  4. 1.6 3km SW of Clayton, CA
  5. 2.1 8km WSW of Mountain House, CA
  6. 2.1 10km ESE of Livermore, CA
  7. 1.5 19km SSE of Livermore, CA
  8. 1.6 3km ENE of Oakland, CA
  9. 1.6 8km WSW of Mountain House, CA
  10. 2.2 3km ENE of Walnut Creek, CA
  11. 2.0 8km WSW of Mountain House, CA
  12. 1.5 10km NE of Milpitas, CA
  13. 1.5 12km ESE of Alum Rock, CA
  14. 3.2 3km ESE of San Leandro, CA
  15. 2.6 3km ESE 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 26,000 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.