Earthquake · reviewed by a seismologist
M 2.5ml
16 km S of Santa Rosa Is., CA
Yes. A magnitude 2.5 earthquake was recorded 16 km S of Santa Rosa Is., CA, 91 km (57 mi) WSW of Oxnard, CA, at 5:14 pm PDT on 24 September 2025 (00:14 UTC), 2.6 km deep.
91 km (57 mi) WSW of Oxnard, CA
- When
- Magnitude
- M 2.5 (ml)
- Depth
- 2.6 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Barbara County, 82 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 70 days ago
Earthquake alerts for Isla Vista, CA
Get a notification in this browser when USGS records an earthquake near Isla Vista, 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 23 km (14 mi) from the epicentre. 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.
How big was it?
This earthquake released about 200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 75,000× the energy of this one
- Magna, Utah 2020 M 5.7 53,000× the energy of this one
- Around the size people start to feel M 3.0 4.7× the energy of this one
- This earthquake M 2.5 about 200 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 5.3 on 2018-04-05 — about 13,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 20km ENE of Santa Cruz Is. (NW end), CA · 50 km NE 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 33.8003, -120.0753. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Santa Barbara County, CA | 82 km (51 mi) | N | earthquakes near Santa Barbara County |
| Ventura County, CA | 107 km (66 mi) | NE | earthquakes near Ventura County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.8 14 km WSW of Santa Cruz Is. (E end), CA
- 1.6 24 km SSW of Santa Rosa Is., CA
- 1.8 15 km N of Santa Cruz Is. (NW end), CA
- 2.6 15 km S of Santa Rosa Is., 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.