4km WSW of Brentwood, CA

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

How big was it?

This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
3. Around the size people start to feel M 3.0 160× the energy of this one
4. This earthquake M 1.5 about 5.9 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.

Where

Epicentre 37.9098, -121.7630. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.6 10km NNE of Milpitas, CA 08:38 UTC
2. 2.0 7km S of Livermore, CA 17:06 UTC
3. 1.9 7km S of Livermore, CA 16:52 UTC
4. 3.3 10km NE of Milpitas, CA 16:02 UTC
5. 2.9 10km NE of Milpitas, CA 15:36 UTC
6. 2.7 10km NE of Milpitas, CA 15:16 UTC
7. 2.1 4km ESE of Berkeley, CA 18:49 UTC
8. 1.7 1km SW of Diablo, CA 11:25 UTC
9. 1.9 10km NE of Milpitas, CA 08:15 UTC
10. 1.6 10km NE of Milpitas, CA 07:14 UTC
11. 1.8 10km NE of Milpitas, CA 06:05 UTC
12. 2.1 10km NE of Milpitas, CA 06:03 UTC
13. 2.0 10km NE of Milpitas, CA 05:24 UTC
14. 3.5 10km NE of Milpitas, CA 05:16 UTC
15. 2.0 10km NE of Milpitas, CA 22:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:05 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2019-10-15 — it released about 25,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.