QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near Lafayette, CA

No earthquake was likely felt in Lafayette in the 24 hours to 9:54 pm PST (05:54 UTC). The last one was M 2.1, 8 km (5 mi) NE, at 4:05 am PST on 8 November 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Lafayette

This page: a magnitude 1.7 earthquake was recorded 2 km (1 mi) northeast of Lafayette, CA, at 6:52 pm PDT on 24 March 2025 (01:52 UTC), 8.6 km deep.

USGS: 2 km ENE of Lafayette, CA

5 km (3 mi) W of Walnut Creek, CA · 31 km (19 mi) ENE of San Francisco, CA

6:52 pm PDT, Mar 24, 2025 · · 8.6 km deep · released about 9.6 lb of TNT

Every earthquake near Lafayette Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 13 kmAlameda County 33 kmSolano County 43 kmSan Mateo County 59 kmMarin County 59 kmNapa County 70 kmSan Joaquin County 73 kmSanta Clara County 84 kmSan Francisco 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
6:52 pm PDT on 24 March 2025 ()
Where
2 km (1 mi) northeast of Lafayette, CA · earthquakes near Lafayette
Magnitude
M 1.7 (md)
Depth
8.6 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 13 km E
Nearest mapped fault
Calaveras fault, 9 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 587 days ago

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 8 km (5 mi) from the epicentre. In Lafayette, 2 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: Lafayette 2 km, intensity II · Walnut Creek 3 km, intensity II · Pleasant Hill 6 km, intensity II · Orinda 8 km, intensity II · Alamo 8 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 9.6 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.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 15,000 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.9 The 1906 San Francisco, California Earthquake · 43 km WSW of this epicentre
  2. 6.0 The 2014 South Napa, California Earthquake · 40 km NNW of this epicentre
  3. 5.8 The 1980 Livermore, California Earthquake · 30 km ESE of this epicentre
  4. 5.4 South of Elmira, California · 48 km NNE of this epicentre
  5. 5.4 9 km NE of Livermore, California · 38 km ESE 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 37.9002, -122.0978. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Contra Costa County, CA 13 km (8 mi) E earthquakes near Contra Costa County
Alameda County, CA 33 km (20 mi) SSE earthquakes near Alameda County
Solano County, CA 43 km (27 mi) NNE earthquakes near Solano County
San Mateo County, CA 59 km (37 mi) SSW earthquakes near San Mateo County
Marin County, CA 59 km (37 mi) WNW earthquakes near Marin County
Napa County, CA 70 km (44 mi) NNW earthquakes near Napa 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.

  1. 1.5 3 km WSW of San Ramon, CA
  2. 1.7 2 km SSE of Danville, CA
  3. 1.8 1 km WSW of Concord, CA
  4. 1.9 2 km ESE of Piedmont, CA
  5. 1.5 1 km E of Union City, CA
  6. 1.9 1 km NE of Rodeo, CA
  7. 1.7 5 km SSE of Napa, CA
  8. 1.9 14 km SE of Suisun City, CA
  9. 2.5 3 km of Piedmont, CA
  10. 1.5 3 km N of Piedmont, CA
  11. 2.3 3 km of Piedmont, CA
  12. 1.8 11 km NNE of Pittsburg, CA
  13. 2.1 11 km of Pittsburg, CA
  14. 2.0 1 km WNW of Walnut Creek, CA
  15. 2.3 3 km W of Orinda, 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.