Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near San Jose, CA
No earthquake was likely felt in San Jose in the 24 hours to 1:34 pm PST (21:34 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 1.7 earthquake was recorded 15 km (9 mi) east-northeast of San Jose, CA, at 2:30 pm PDT on 18 April 2023 (21:30 UTC), 7.4 km deep.
USGS: 9km E of Alum Rock, CA
12 km (7 mi) NE of San Jose, CA
- When
- 2:30 pm PDT on 18 April 2023 ()
- Where
- 15 km (9 mi) east-northeast of San Jose, CA · earthquakes near San Jose
- Magnitude
- M 1.7 (md)
- Depth
- 7.4 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Clara County, 17 km SSE
- Nearest mapped fault
- Calaveras 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 1301 days ago
Earthquake alerts for San Jose, CA
Get a notification in this browser when USGS records an earthquake near San Jose, CA. No account or email needed.
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 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 10 km (6 mi) from the epicentre. In San Jose, 15 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: East Foothills, Milpitas, Santa Clara, Campbell, Sunnyvale, Los Gatos.
How big was it?
This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 930,000× the energy of this one
- Around the size people start to feel M 3.0 83× the energy of this one
- This earthquake M 1.7 about 11 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 100,000 times the energy of this one.
Before 2016, the USGS record lists 24 earthquakes of M5 or more within 50 km; the five largest:
- 6.9 The 1989 Loma Prieta, California Earthquake · 40 km SSW of this epicentre
- 6.5 Near Morgan Hill, California · 30 km SSE of this epicentre
- 6.2 Near San Jose, California · 11 km SW of this epicentre
- 6.2 The 1984 Morgan Hill, California Earthquake · 8 km SSE of this epicentre
- 6.1 Near San Jose, California · 21 km SSW 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 37.3753, -121.7282. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Santa Clara County, CA | 17 km (11 mi) | SSE | earthquakes near Santa Clara County |
| Alameda County, CA | 34 km (21 mi) | NNW | earthquakes near Alameda County |
| Santa Cruz County, CA | 47 km (29 mi) | SSW | earthquakes near Santa Cruz County |
| San Mateo County, CA | 57 km (35 mi) | W | earthquakes near San Mateo County |
| Contra Costa County, CA | 64 km (40 mi) | NNW | earthquakes near Contra Costa County |
| Stanislaus County, CA | 67 km (42 mi) | ENE | earthquakes near Stanislaus County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.9 24 km NE of Alum Rock, CA
- 1.6 6km SW of Gilroy, CA
- 1.5 3km SSW of Cupertino, CA
- 3.0 8km NE of Gilroy, CA
- 1.9 8km NE of Gilroy, CA
- 2.0 7km SSE of Portola Valley, CA
- 1.6 7km WSW of Gilroy, CA
- 2.0 2km SE of Portola Valley, CA
- 1.9 7km SSE of Portola Valley, CA
- 2.1 7km SSE of Portola Valley, CA
- 1.8 6km E of Milpitas, CA
- 2.4 8km NE of Gilroy, CA
- 1.6 10km NE of Morgan Hill, CA
- 1.9 13km NNE of Morgan Hill, CA
- 2.6 7km WSW of Gilroy, 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.