M0.9 earthquake 36 km E of San Diego Country Estates, California, United States
A magnitude 0.9 earthquake struck 36 km E of San Diego Country Estates, California, United States at 23:53 local time (06:53 UTC) on 9 Oct 2026, at a depth of 10 km, according to USGS. The solution is preliminary and may be revised.
revised from M1.0
Data: USGS · updated 2026-10-10 06:56 UTC · automatic solution
- Magnitude
- 0.9micro
local magnitude (Richter) (ml)
revised from 1.0 - Depth
- 9.7 km
- Status
- Automatic
- Origin time
- 2026-10-10 06:53:19 UTC
- Local: 9 Oct 2026, 23:53:19 (America/Los Angeles)
- Epicentre
- 33.040° N, 116.394° W
Advertisement
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 |
|---|---|---|
| San Diego Country EstatesCalifornia, United States · pop. 10,109 | 36 km | INot felt |
| AlpineCalifornia, United States · pop. 14,236 | 42 km | INot felt |
| RamonaCalifornia, United States · pop. 20,292 | 44 km | INot felt |
| LakesideCalifornia, United States · pop. 20,648 | 53 km | INot felt |
| Winter GardensCalifornia, United States · pop. 20,631 | 55 km | INot felt |
| TecateBaja California, Mexico · pop. 64,764 | 57 km | INot felt |
| Chula VistaCalifornia, United States · pop. 265,757 | 78 km | INot felt |
| San DiegoCalifornia, United States · pop. 1,404,452 | 80 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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey | 0.9 mlwas 1.0 | 9.7 km | 33.04° N, 116.39° W | – | Automatic · 1 revision |
Advertisement
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 401 g 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 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.0 releases about 1.2× the energy of M0.9, and its waves are about 1.1× taller on a seismogram. Energy: 477 g of TNT vs 401 g of TNT.
Each square is the energy of one M0.9. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
2 later earthquakes within 30 km; the largest was M1.0 7 h ago. 18 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M0.9
2 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 0.36 | 1.0 | 12 |
| 4.44 | 0.3 | 6 |
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Advertisement
Event id ci41345959. First recorded here 10 Oct 2026, 06:56:33 UTC. Solutions: USGS · CI (usgs:ci41345959). Cite as: SeismoAtlas, “M0.9 earthquake 36 km E of San Diego Country Estates, California, United States”, https://seismoatlas.com/earthquake/ci41345959-m0-9-earthquake-36-km-e-of-san-diego-country-estates-california-united-states, data from USGS.
JSON: /api/v1/events/ci41345959. SeismoAtlas is not an official warning service.