Earthquake near San Jose, CA

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In San Jose, 24 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: Fremont, Pleasanton, Milpitas, Union City, Livermore, Newark.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
3. Around the size people start to feel M 3.0 65× the energy of this one
4. This earthquake M 1.8 about 15 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 5.1 on 2022-10-25 — about 80,000 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

1. 6.2 Near San Jose, California · 28 km S of this epicentre Aug 3, 1903
2. 6.2 The 1984 Morgan Hill, California Earthquake · 31 km SSE of this epicentre Apr 24, 1984
3. 6.1 Near San Jose, California · 39 km S of this epicentre Jun 11, 1903
4. 5.8 7 km NNW of Boulder Creek, California · 48 km SSW of this epicentre Sep 5, 1955
5. 5.8 The 1980 Livermore, California Earthquake · 33 km NNE of this epicentre Jan 24, 1980

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 37.5530, -121.8485. Map © OpenStreetMap contributors.

Nearby places

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.

1. 1.7 1 km WSW of San Ramon, CA 08:44 UTC
2. 2.0 1 km WSW of San Ramon, CA 17:05 UTC
3. 2.0 1 km WSW of San Ramon, CA 16:59 UTC
4. 1.9 5 km NNE of Castro Valley, CA 16:21 UTC
5. 2.4 10 km NE of Morgan Hill, CA 17:57 UTC
6. 1.6 4 km NNE of San Mateo, CA 21:56 UTC
7. 1.7 2 km NNW of Diablo, CA 09:56 UTC
8. 2.1 2 km SW of Alamo, CA 02:21 UTC
9. 2.4 5 km NE of Castro Valley, CA 13:05 UTC
10. 1.6 5 km NE of Castro Valley, CA 05:09 UTC
11. 1.9 4 km WNW of Los Altos Hills, CA 06:42 UTC
12. 2.5 9 km E of Alum Rock, CA 06:11 UTC
13. 1.6 0 km NW of Castro Valley, CA 00:42 UTC
14. 1.7 8 km N of Livermore, CA 17:28 UTC
15. 2.6 7 km SW of Brentwood, CA 07:40 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 03:16 UTC. 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.