M2.4 earthquake 18 km E of Alpine, California, United States
A magnitude 2.4 earthquake struck 18 km E of Alpine, California, United States at 02:04 local time (10:04 UTC) on 4 Nov 2026, at a depth of 14 km, according to USGS.
revised from M2.8 · 14 reports to USGS “Did You Feel It?”
Data: USGS · updated 2026-11-04 15:10 UTC · reviewed
- Magnitude
- 2.4micro
local magnitude (Richter) (ml)
revised from 2.8 - Depth
- 14 km
- Status
- Reviewed
- Origin time
- 2026-11-04 10:04:59 UTC
- Local: 4 Nov 2026, 02:04:59 (America/Los Angeles)
- Epicentre
- 32.860° N, 116.578° W
Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| AlpineCalifornia, United States · pop. 14,236 | 18 km | INot felt |
| San Diego Country EstatesCalifornia, United States · pop. 10,109 | 25 km | INot felt |
| LakesideCalifornia, United States · pop. 20,648 | 32 km | INot felt |
| TecateBaja California, Mexico · pop. 64,764 | 33 km | INot felt |
| Winter GardensCalifornia, United States · pop. 20,631 | 33 km | INot felt |
| RamonaCalifornia, United States · pop. 20,292 | 34 km | INot felt |
| Chula VistaCalifornia, United States · pop. 265,757 | 53 km | INot felt |
| TijuanaBaja California, Mexico · pop. 1,922,523 | 56 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · CI, which has been reviewed by an analyst.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey | 2.4 mlwas 2.5 | 14 km | 32.86° N, 116.58° W | – | Reviewed · 2 revisions |
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 58 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 14 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M2.4 releases about 31× the energy of M1.4, and its waves are about 9.8× taller on a seismogram. Energy: 58 kg of TNT vs 2 kg of TNT.
Each square is the energy of one M1.4. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
9 later earthquakes within 30 km; the largest was M1.3 4 days ago. 16 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M2.4
9 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 69.03 | 0.9 | 13 |
| 74.97 | 1.1 | 14 |
| 88.62 | 1.3 | 9 |
| 93.23 | 0.9 | 10 |
| 93.74 | 0.8 | 9 |
| 95.22 | 1.0 | 9 |
| 157.29 | 0.6 | 9 |
| 188.50 | 1.0 | 9 |
| 188.94 | 0.7 | 12 |
- 1.330 km E of San Diego Country Estates, California, United States11-08 02:42
- 1.132 km E of San Diego Country Estates, California, United States11-07 13:03
- 1.017 km ENE of Alpine, California, United States11-12 06:34
- 1.030 km E of San Diego Country Estates, California, United States11-08 09:17
- 0.934 km E of San Diego Country Estates, California, United States11-07 07:06
- 0.920 km ENE of San Diego Country Estates, California, United States11-08 07:18
- 0.830 km E of San Diego Country Estates, California, United States11-08 07:49
- 0.726 km ENE of San Diego Country Estates, California, United States11-12 07:01
- 0.617 km ESE of Alpine, California, United States11-10 23:22
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Event id ci41572384. First recorded here 4 Nov 2026, 10:08:02 UTC. Solutions: USGS · CI (usgs:ci41572384). Cite as: SeismoAtlas, “M2.4 earthquake 18 km E of Alpine, California, United States”, https://seismoatlas.com/earthquake/ci41572384-m2-4-earthquake-18-km-e-of-alpine-california-united-states, data from USGS.
JSON: /api/v1/events/ci41572384. SeismoAtlas is not an official warning service.