Earthquake near Milpitas, CA

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 13 km (8 mi) from the epicentre. In Milpitas, 11 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: Milpitas 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 16 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 5.8 930,000× the energy of this one
2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
3. Around the size people start to feel M 3.0 59× the energy of this one
4. This earthquake M 1.8 about 16 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 4.3 on 2019-07-16 — about 5,400 times the energy of this one.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

1. 6.5 Near Morgan Hill, California · 46 km SSE of this epicentre Jul 1, 1911
2. 6.2 Near San Jose, California · 22 km S of this epicentre Aug 3, 1903
3. 6.2 The 1984 Morgan Hill, California Earthquake · 24 km SSE of this epicentre Apr 24, 1984
4. 6.1 Near San Jose, California · 33 km S of this epicentre Jun 11, 1903
5. 5.8 7 km NNW of Boulder Creek, California · 45 km SW of this epicentre Sep 5, 1955

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 37.4982, -121.8210. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.7 1km NE of Diablo, CA 12:01 UTC
2. 1.5 2km S of Dublin, CA 06:41 UTC
3. 1.8 9km NNE of Alum Rock, CA 01:05 UTC
4. 2.1 15km ENE of Seven Trees, CA 02:09 UTC
5. 1.8 6km SSE of Portola Valley, CA 14:40 UTC
6. 1.9 6km SSE of Portola Valley, CA 14:18 UTC
7. 2.1 2km NNE of San Leandro, CA 14:10 UTC
8. 1.7 4km WNW of Dublin, CA 08:57 UTC
9. 1.6 11km NE of Milpitas, CA 02:44 UTC
10. 2.2 10km SE of Sunol, CA 20:03 UTC
11. 2.1 10km ESE of Fremont, CA 18:40 UTC
12. 1.8 24km SSE of Livermore, CA 22:35 UTC
13. 1.9 8km WSW of Mountain House, CA 00:40 UTC
14. 1.8 2km WNW of Los Altos Hills, CA 18:44 UTC
15. 3.4 24km NE of Alum Rock, CA 17:02 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:42 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.