Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Danville, CA
No earthquake was likely felt in Danville in the 24 hours to 4:24 am PST (12:24 UTC). The last one was M 2.6, 22 km (14 mi) WNW, at 6:23 pm PST on 1 November 2026, estimated intensity II (weak) in town; 114 felt reports to USGS. Every earthquake near Danville
This page: a magnitude 1.6 earthquake was recorded 5 km (3 mi) southwest of Danville, CA, at 10:20 pm PST on 24 February 2018 (06:20 UTC), 10 km deep. 3 people have reported feeling it to USGS.
USGS: 4km SW of Danville, CA
16 km (10 mi) E of Oakland, CA · 10 km (6 mi) WNW of San Ramon, CA
- When
- 10:20 pm PST on 24 February 2018 ()
- Where
- 5 km (3 mi) southwest of Danville, CA · earthquakes near Danville
- Magnitude
- M 1.6 (md)
- Depth
- 10 km below the surface
- Felt
- 3 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 16 km NNE
- 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 3179 days ago
Earthquake alerts for Danville, 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 6 km (4 mi) from the epicentre. In Danville, 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: Danville 5 km, intensity II · Alamo 6 km, intensity II · San Ramon 6 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 9 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.
- Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 9 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 4.4 on 2018-01-04 — about 12,000 times the energy of this one.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 7.9 The 1906 San Francisco, California Earthquake · 45 km W of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 25 km E of this epicentre
- 5.7 15 km NE of East Foothills, California · 47 km SE of this epicentre
- 5.5 6 km NNE of East Foothills, California · 47 km SSE of this epicentre
- 5.4 9 km NE of Livermore, California · 30 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 37.7978, -122.0420. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 16 km (10 mi) | NNE | earthquakes near Contra Costa County |
| Alameda County, CA | 20 km (13 mi) | SE | earthquakes near Alameda County |
| San Mateo County, CA | 52 km (32 mi) | SW | earthquakes near San Mateo County |
| Solano County, CA | 53 km (33 mi) | N | earthquakes near Solano County |
| Marin County, CA | 68 km (42 mi) | WNW | earthquakes near Marin County |
| San Joaquin County, CA | 69 km (43 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
59 earthquakes have been recorded within 50 km since this one.
- 2.6 5km NNW of Diablo, CA
- 3.3 5km NE of Alamo, CA
- 1.9 2km ENE of Danville, CA
- 2.9 2km E of Danville, CA
- 1.5 2km E of Danville, CA
- 2.4 2km ENE of Danville, CA
- 1.5 2km E of Danville, CA
- 2.7 2km NE of Danville, CA
- 1.9 2km E of Danville, CA
- 2.1 2km W of Diablo, CA
- 2.9 2km WSW of Diablo, CA
- 1.5 2km W of Diablo, CA
- 1.5 2km E of Danville, CA
- 1.7 4km ENE of Walnut Creek, CA
- 1.7 9km NE of Milpitas, 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.