QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Dublin, CA

No earthquake was likely felt in Dublin in the 24 hours to 10:54 pm PST (06:54 UTC). The last one was M 1.9, 5 km (3 mi) SW, at 10:32 am PST on 2 November 2026, estimated intensity II (weak) in town. Every earthquake near Dublin

This page: a magnitude 1.6 earthquake was recorded 4 km (3 mi) east-northeast of Dublin, CA, at 10:35 pm PDT on 16 August 2023 (05:35 UTC), 15 km deep.

USGS: 4 km ENE of Dublin, CA

in Dublin, CA · 46 km (29 mi) N of San Jose, CA

10:35 pm PDT, Aug 16, 2023 · · 15 km deep · released about 8.1 lb of TNT

Every earthquake near Dublin Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alameda County 7 kmContra Costa County 24 kmSan Mateo County 54 kmSanta Clara County 57 kmSan Joaquin County 60 kmSolano County 62 kmSanta Cruz County 78 kmStanislaus County 80 kmMarin 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
10:35 pm PDT on 16 August 2023 ()
Where
4 km (3 mi) east-northeast of Dublin, CA · earthquakes near Dublin
Magnitude
M 1.6 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Alameda County, 7 km SSW
Nearest mapped fault
Pleasanton fault, 1 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1183 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Dublin, 4 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Pleasanton, San Ramon, Livermore, Blackhawk, Fairview, Diablo.

How big was it?

This earthquake released about 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.1 on 2022-10-25 — about 140,000 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 Near San Jose, California · 46 km S of this epicentre
  2. 6.2 The 1984 Morgan Hill, California Earthquake · 48 km SSE of this epicentre
  3. 5.8 The 1980 Livermore, California Earthquake · 18 km NE of this epicentre
  4. 5.7 15 km NE of East Foothills, California · 31 km SE of this epicentre
  5. 5.5 6 km NNE of East Foothills, California · 32 km SSE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 37.7098, -121.8890. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Alameda County, CA 7 km (5 mi) SSW earthquakes near Alameda County
Contra Costa County, CA 24 km (15 mi) NNW earthquakes near Contra Costa County
San Mateo County, CA 54 km (33 mi) SW earthquakes near San Mateo County
Santa Clara County, CA 57 km (35 mi) SSE earthquakes near Santa Clara County
San Joaquin County, CA 60 km (37 mi) ENE earthquakes near San Joaquin County
Solano County, CA 62 km (39 mi) N earthquakes near Solano County

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

Aftershocks so far

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

  1. 2.2 2 km NNE of Millbrae, CA
  2. 2.8 11 km ESE of Alum Rock, CA
  3. 3.7 2 km NNE of Millbrae, CA
  4. 1.8 2 km ENE of Berkeley, CA
  5. 2.5 2 km ENE of Berkeley, CA
  6. 2.1 2 km E of Pacheco, CA
  7. 1.6 6 km E of Fremont, CA
  8. 2.6 8 km ENE of Alum Rock, CA
  9. 2.1 1 km E of Pinole, CA
  10. 1.8 2 km NNE of Millbrae, CA
  11. 1.9 24 km ENE of Alum Rock, CA
  12. 1.6 3 km SW of San Ramon, CA
  13. 2.4 8 km E of Fremont, CA
  14. 2.0 1 km E of Pacheco, CA
  15. 2.0 2 km N of San Ramon, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.