Earthquake · reviewed by a seismologist
M 3.4mw
Earthquake near San Jose, CA
No earthquake was likely felt in San Jose in the 24 hours to 8:47 pm PST (04:47 UTC). The last one was M 2.6, 19 km (12 mi) E, at 12:38 pm PDT on 27 October 2026, estimated intensity II (weak) in town; 8 felt reports to USGS. Every earthquake near San Jose
This page: a magnitude 3.4 earthquake was recorded 30 km (19 mi) northeast of San Jose, CA, at 10:02 am PDT on 28 September 2022 (17:02 UTC), 7.6 km deep. 73 people have reported feeling it to USGS.
USGS: 24km NE of Alum Rock, CA
28 km (18 mi) NE of San Jose, CA · 24 km (15 mi) SSE of Livermore, CA
- When
- 10:02 am PDT on 28 September 2022 ()
- Where
- 30 km (19 mi) northeast of San Jose, CA · earthquakes near San Jose
- Magnitude
- M 3.4 (mw)
- Depth
- 7.6 km below the surface
- Felt
- 73 reports · strongest reported intensity III
- Nearest
- Alameda County, 30 km WNW
- Nearest mapped fault
- Greenville 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 1439 days ago
Earthquake alerts for San Jose, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 54 km (34 mi) from the epicentre. In San Jose, 30 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: Livermore 24 km, intensity II · Milpitas 26 km, intensity II · Pleasanton 29 km, intensity II · San Jose 30 km, intensity II · Tracy 32 km, intensity II · Fremont 33 km, intensity II · Santa Clara 34 km, intensity II · Dublin 36 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 110,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
- Magna, Utah 2020 M 5.7 3,300× the energy of this one
- This earthquake M 3.4 about 1.6 tons of TNT
- Around the size people start to feel M 3.0 this one released 3.3× more
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 28 times the energy of this one.
Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 Near Morgan Hill, California · 43 km S of this epicentre
- 6.2 Near San Jose, California · 27 km SW of this epicentre
- 6.2 The 1984 Morgan Hill, California Earthquake · 22 km SSW of this epicentre
- 6.1 Near San Jose, California · 37 km SSW of this epicentre
- 5.8 The 1979 Coyote Lake, California Earthquake · 45 km SSE 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 37.5000, -121.6207. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Alameda County, CA | 30 km (19 mi) | WNW | earthquakes near Alameda County |
| Santa Clara County, CA | 32 km (20 mi) | S | earthquakes near Santa Clara County |
| Stanislaus County, CA | 55 km (34 mi) | E | earthquakes near Stanislaus County |
| Contra Costa County, CA | 55 km (34 mi) | NNW | earthquakes near Contra Costa County |
| San Joaquin County, CA | 57 km (36 mi) | NNE | earthquakes near San Joaquin County |
| Santa Cruz County, CA | 64 km (40 mi) | SSW | earthquakes near Santa Cruz County |
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.
- 1.9 4km ENE of San Ramon, CA
- 2.1 16km N of Morgan Hill, CA
- 1.6 6km ESE of Pleasanton, CA
- 1.6 15km N of Morgan Hill, CA
- 1.8 7km SE of Pleasanton, CA
- 2.8 9km NE of Alum Rock, CA
- 2.8 15km E of Seven Trees, CA
- 2.0 7km ESE of Pleasanton, CA
- 1.7 7km SE of Pleasanton, CA
- 1.7 9km NE of Gilroy, CA
- 2.8 14km ESE of Alum Rock, CA
- 1.5 6km SE of Pleasanton, CA
- 1.8 6km SE of Pleasanton, CA
- 2.8 6km SE of Pleasanton, CA
- 2.4 6km ESE of Pleasanton, 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
- 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.