Earthquake · automatic estimate, may change
M 3.1ml
Earthquake near Gustine, CA
No earthquake was likely felt in Gustine in the 24 hours to 6:14 am PST (14:14 UTC). The last one was M 3.1, 23 km (14 mi) WSW, at 9:18 pm PDT on 21 October 2026, estimated intensity II (weak) in town; 9 felt reports to USGS. Every earthquake near Gustine
This page: a magnitude 3.1 earthquake was recorded 23 km (14 mi) west-southwest of Gustine, CA, at 9:18 pm PDT on 21 October 2026 (04:18 UTC), less than 1 km deep. 9 people have reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.
USGS: 23 km WSW of Gustine, CA
54 km (33 mi) ESE of San Jose, CA · 36 km (23 mi) ENE of Gilroy, CA
- When
- 9:18 pm PDT on 21 October 2026 ()
- Where
- 23 km (14 mi) west-southwest of Gustine, CA · earthquakes near Gustine
- Magnitude
- M 3.1 (ml)
- Depth
- -0.7 km below the surface
- Felt
- 9 reports · strongest reported intensity II
- Nearest
- Santa Clara County, 41 km W
- Nearest mapped fault
- Ortigalita fault, 2 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 21 days ago
Earthquake alerts for Gustine, CA
Get a notification in this browser when USGS records an earthquake near Gustine, 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 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 44 km (27 mi) from the epicentre. In Gustine, 23 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: Gustine 23 km, intensity II · Newman 24 km, intensity II · Patterson 35 km, intensity II · Gilroy 35 km, intensity II · Los Banos 36 km, intensity II · Morgan Hill 38 km, intensity II · Hollister 38 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 210,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
- Magna, Utah 2020 M 5.7 6,700× the energy of this one
- This earthquake M 3.1 about 1,600 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.7× 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 5.1 on 2022-10-25 — about 730 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 · 37 km W of this epicentre
- 6.2 The 1984 Morgan Hill, California Earthquake · 43 km WNW of this epicentre
- 5.9 10 km SE of Tres Pinos, California · 49 km S of this epicentre
- 5.8 Near Watsonville, California · 48 km WSW of this epicentre
- 5.8 The 1979 Coyote Lake, California Earthquake · 26 km WSW 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 37.1700, -121.2297. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Santa Clara County, CA | 41 km (26 mi) | W | earthquakes near Santa Clara County |
| Merced County, CA | 45 km (28 mi) | E | earthquakes near Merced County |
| Stanislaus County, CA | 48 km (30 mi) | NNE | earthquakes near Stanislaus County |
| San Benito County, CA | 63 km (39 mi) | SSE | earthquakes near San Benito County |
| Santa Cruz County, CA | 71 km (44 mi) | WSW | earthquakes near Santa Cruz County |
| Alameda County, CA | 80 km (50 mi) | NW | earthquakes near Alameda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.6 9 km E of Gilroy, CA
- 1.7 15 km E of Seven Trees, CA
- 1.4 15 km N of Morgan Hill, CA
- 2.0 4 km SSW of San Juan Bautista, CA
- 2.1 26 km SW of Gustine, CA
- 1.3 4 km N of Hollister, CA
- 1.0 4 km NNW of Hollister, CA
- 1.1 13 km ESE of Gilroy, CA
- 0.9 27 km SW of Westley, CA
- 1.2 15 km ENE of Alum Rock, CA
- 1.9 26 km SE of Livermore, CA
- 1.6 26 km WSW of Westley, CA
- 1.5 4 km NNW of Hollister, CA
- 1.1 27 km SW of Gustine, CA
- 1.7 5 km NNW of Hollister, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| felt reports | 8 | 9 | |
| felt reports | 7 | 8 | |
| felt reports | 6 | 7 | |
| felt reports | 5 | 6 | |
| felt reports | 4 | 5 | |
| felt reports | 3 | 4 | |
| reported intensity | 1 | 2.1 | |
| felt reports | 2 | 3 | |
| felt reports | 1 | 2 | |
| reported intensity | not reported | 1 | |
| felt reports | not reported | 1 |
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.