Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Dublin, CA
No earthquake was likely felt in Dublin in the 24 hours to 3:06 am PST (11:06 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 1.7 earthquake was recorded 5 km (3 mi) west-northwest of Dublin, CA, at 5:01 pm PDT on 14 August 2021 (00:01 UTC), 5.8 km deep.
USGS: 5km WNW of Dublin, CA
6 km (4 mi) SW of San Ramon, CA · 39 km (24 mi) E of San Francisco, CA
- When
- 5:01 pm PDT on 14 August 2021 ()
- Where
- 5 km (3 mi) west-northwest of Dublin, CA · earthquakes near Dublin
- Magnitude
- M 1.7 (md)
- Depth
- 5.8 km below the surface
- Felt
- no reports yet
- Nearest
- Alameda County, 10 km SE
- Nearest mapped fault
- Calaveras fault, 3 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 1909 days ago
Earthquake alerts for Dublin, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 11 km (7 mi) from the epicentre. In Dublin, 5 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.
Likely felt in: Dublin 5 km, intensity II · San Ramon 6 km, intensity II · Castro Valley 10 km, intensity II · Hayward 11 km, intensity II · Danville 11 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 92× the energy of this one
- This earthquake M 1.7 about 10 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 4.5 on 2019-10-15 — about 14,000 times the energy of this one.
Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 Near San Jose, California · 50 km SSE of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 23 km NE of this epicentre
- 5.7 15 km NE of East Foothills, California · 38 km SE of this epicentre
- 5.5 6 km NNE of East Foothills, California · 37 km SSE of this epicentre
- 5.4 9 km NE of Livermore, California · 24 km E 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 37.7238, -121.9807. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Alameda County, CA | 10 km (6 mi) | SE | earthquakes near Alameda County |
| Contra Costa County, CA | 22 km (14 mi) | N | earthquakes near Contra Costa County |
| San Mateo County, CA | 49 km (30 mi) | SW | earthquakes near San Mateo County |
| Solano County, CA | 61 km (38 mi) | N | earthquakes near Solano County |
| Santa Clara County, CA | 61 km (38 mi) | SSE | earthquakes near Santa Clara County |
| San Joaquin County, CA | 67 km (41 mi) | ENE | earthquakes near San Joaquin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 2.8 4km ENE of El Sobrante, CA
- 2.1 4km ENE of El Sobrante, CA
- 1.6 10km NE of Milpitas, CA
- 1.5 3km SSW of Clayton, CA
- 1.9 1km S of San Ramon, CA
- 1.6 9km SE of Sunol, CA
- 1.6 5km SW of Clayton, CA
- 2.8 16km SSE of Livermore, CA
- 1.6 6km E of Vallejo, CA
- 2.1 3km WNW of Crockett, CA
- 1.6 3km W of Fruitdale, CA
- 1.6 4km SSW of San Francisco Zoo, CA
- 2.1 4km WSW of Alamo, CA
- 2.1 6km SSW of Moraga, CA
- 1.9 5km SW of Pacheco, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.