QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near San Leandro, CA

No earthquake was likely felt in San Leandro in the 24 hours to 10:13 am PST (18:13 UTC). The last one was M 2.6, 18 km (11 mi) NNW, at 6:23 pm PST on 1 November 2026, estimated intensity II (weak) in town; 114 felt reports to USGS. Every earthquake near San Leandro

This page: a magnitude 1.6 earthquake was recorded 6 km (4 mi) north of San Leandro, CA, at 4:12 pm PST on 23 February 2026 (00:12 UTC), 10 km deep. 2 people have reported feeling it to USGS.

USGS: 6 km N of San Leandro, CA

6 km (4 mi) E of Oakland, CA

4:12 pm PST, Feb 23, 2026 · · 10 km deep · released about 7.8 lb of TNT

Every earthquake near San Leandro Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 24 kmAlameda County 26 kmSan Mateo County 45 kmSolano County 58 kmMarin County 60 kmSanta Clara County 74 kmSan Francisco County 77 kmSan Joaquin County 80 kmNapa County 82 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
4:12 pm PST on 23 February 2026 ()
Where
6 km (4 mi) north of San Leandro, CA · earthquakes near San Leandro
Magnitude
M 1.6 (md)
Depth
10 km below the surface
Felt
2 reports · strongest reported intensity I
Nearest
Contra Costa County, 24 km NE
Nearest mapped fault
Hayward fault, 2 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 253 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 5 km (3 mi) from the epicentre. In San Leandro, 6 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: Moraga, Piedmont, Alameda, Ashland, Oakland, Castro Valley.

How big was it?

This earthquake released about 7.8 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 1,400,000× 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 7.8 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 19,000 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 7.9 The 1906 San Francisco, California Earthquake · 35 km W of this epicentre
  2. 5.8 The 1980 Livermore, California Earthquake · 35 km ENE of this epicentre
  3. 5.4 9 km NE of Livermore, California · 40 km E of this epicentre
  4. 5.3 The 1957 San Francisco, California Earthquake · 31 km WSW of this epicentre
  5. 5.1 11 km E of Blackhawk, California · 34 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 37.7778, -122.1562. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Contra Costa County, CA 24 km (15 mi) NE earthquakes near Contra Costa County
Alameda County, CA 26 km (16 mi) SE earthquakes near Alameda County
San Mateo County, CA 45 km (28 mi) SSW earthquakes near San Mateo County
Solano County, CA 58 km (36 mi) NNE earthquakes near Solano County
Marin County, CA 60 km (37 mi) WNW earthquakes near Marin County
Santa Clara County, CA 74 km (46 mi) SE earthquakes near Santa Clara 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. 1.7 5 km SE of San Ramon, CA
  2. 1.7 5 km SE of San Ramon, CA
  3. 2.0 8 km SSW of Brentwood, CA
  4. 2.5 4 km SE of San Ramon, CA
  5. 2.0 9 km SW of Brentwood, CA
  6. 1.5 3 km ESE of San Ramon, CA
  7. 1.7 2 km SE of Pacifica, CA
  8. 1.8 3 km SE of Pacifica, CA
  9. 1.8 3 km SE of Pacifica, CA
  10. 1.6 2 km SE of Pacifica, CA
  11. 1.6 4 km SE of San Ramon, CA
  12. 1.6 3 km ESE of San Ramon, CA
  13. 2.8 3 km ESE of San Ramon, CA
  14. 1.9 3 km ESE of San Ramon, CA
  15. 1.9 3 km SE of Pacifica, 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.