Earthquake · automatic estimate, may change
M 2.4md
Earthquake near San Jose, CA
No earthquake was likely felt in San Jose in the 24 hours to 11:46 pm PST (07:46 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 2.4 earthquake was recorded 26 km (16 mi) west-southwest of San Jose, CA, at 8:21 am PST on 21 December 2024 (16:21 UTC), 11 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 11 km of Boulder Creek, CA
14 km (9 mi) SW of Cupertino, CA · 31 km (19 mi) WSW of San Jose, CA
- When
- 8:21 am PST on 21 December 2024 ()
- Where
- 26 km (16 mi) west-southwest of San Jose, CA · earthquakes near San Jose
- Magnitude
- M 2.4 (md)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Cruz County, 27 km SSE
- Nearest mapped fault
- Butano fault, 1 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 691 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 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 18 km (11 mi) from the epicentre. In San Jose, 26 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: Boulder Creek 11 km, intensity II · Saratoga 12 km, intensity II · Cupertino 15 km, intensity II · Los Gatos 16 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 120,000× the energy of this one
- Magna, Utah 2020 M 5.7 83,000× the energy of this one
- Around the size people start to feel M 3.0 7.4× the energy of this one
- This earthquake M 2.4 about 130 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 9,100 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 6.9 The 1989 Loma Prieta, California Earthquake · 32 km SE of this epicentre
- 6.5 Near Morgan Hill, California · 47 km ESE of this epicentre
- 6.3 22 km S of Davenport, California · 46 km S of this epicentre
- 6.3 16 km SW of Davenport, California · 37 km SSW of this epicentre
- 6.2 Near San Jose, California · 32 km ENE 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 37.2225, -122.1503. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Santa Cruz County, CA | 27 km (17 mi) | SSE | earthquakes near Santa Cruz County |
| San Mateo County, CA | 29 km (18 mi) | NW | earthquakes near San Mateo County |
| Santa Clara County, CA | 41 km (25 mi) | E | earthquakes near Santa Clara County |
| Alameda County, CA | 52 km (32 mi) | NNE | earthquakes near Alameda County |
| Contra Costa County, CA | 79 km (49 mi) | NNE | earthquakes near Contra Costa County |
| San Francisco County, CA | 96 km (60 mi) | NW | earthquakes near San Francisco County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
44 earthquakes have been recorded within 50 km since this one.
- 1.7 12 km W of Saratoga, CA
- 1.9 4 km WSW of Saratoga, CA
- 1.7 5 km S of Portola Valley, CA
- 1.7 16 km SW of Santa Cruz, CA
- 1.8 5 km S of Portola Valley, CA
- 1.7 15 km E of Seven Trees, CA
- 1.8 5 km S of Loyola, CA
- 1.7 9 km SW of La Selva Beach, CA
- 1.6 15 km E of Seven Trees, CA
- 1.7 3 km SSE of Pacifica, CA
- 2.0 3 km SSE of Pacifica, CA
- 1.6 10 km SSW of La Selva Beach, CA
- 2.1 12 km ENE of Milpitas, CA
- 1.8 15 km E of Seven Trees, CA
- 1.7 4 km WSW of Millbrae, 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.