M0.4 earthquake 34 km ENE of San Diego Country Estates, California, United States

A magnitude 0.4 earthquake struck 34 km ENE of San Diego Country Estates, California, United States at 22:35 local time (05:35 UTC) on 29 Oct 2026, at a depth of 12 km, according to USGS.

Data: USGS · updated 2026-10-30 12:42 UTC · reviewed

Magnitude: 0.4micro
local magnitude (Richter) (ml)
Depth: 12.4 km
Status: Reviewed
Origin time: 2026-10-30 05:35:40 UTC; Local: 29 Oct 2026, 22:35:40 (America/Los Angeles)
Epicentre: 33.103° N, 116.436° 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

Distance and estimated shaking at nearby places
Place	Distance	Est. shaking
San Diego Country EstatesCalifornia, United States · pop. 10,109	34 km	INot felt
RamonaCalifornia, United States · pop. 20,292	41 km	INot felt
LakesideCalifornia, United States · pop. 20,648	53 km	INot felt
Winter GardensCalifornia, United States · pop. 20,631	55 km	INot felt
SanteeCalifornia, United States · pop. 57,787	58 km	INot felt
Chula VistaCalifornia, United States · pop. 265,757	79 km	INot felt
San DiegoCalifornia, United States · pop. 1,404,452	80 km	INot felt
TijuanaBaja California, Mexico · pop. 1,922,523	85 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	0.4 ml	12.4 km	33.10° N, 116.44° W	–	Reviewed · 1 revision

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 64 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 12 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M0.4 with M1.0

M1.0 releases about 7.4× the energy of M0.4, and its waves are about 3.8× taller on a seismogram. Energy: 477 g of TNT vs 64 g of TNT.

Each square is the energy of one M0.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

37 later earthquakes within 30 km; the largest was M1.9 12 days ago. 33 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.4

37 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
0.30	0.6	7
22.42	0.8	11
28.15	1.9	7
30.13	0.2	9
40.11	0.8	12
40.29	1.1	10
51.64	0.7	17
77.59	1.2	8
85.07	0.8	9
85.31	1.1	9
86.68	0.8	9
96.04	0.9	10
98.22	1.4	11
101.63	0.2	14
112.30	0.7	13
125.20	0.8	9
136.85	0.7	13
165.73	1.1	11
173.16	0.4	11
178.85	0.9	14
193.52	0.9	13
199.46	1.1	14
213.11	1.3	9
217.72	0.9	10
218.23	0.8	9
219.70	1.0	9
249.19	0.6	5
259.94	0.4	11
263.12	1.2	12
276.25	1.0	11
277.72	0.4	11
305.17	1.4	2
305.79	0.9	10
312.78	0.4	12
312.98	1.0	9
313.43	0.7	12
314.13	0.6	17

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.

Event id ci41569400. First recorded here 30 Oct 2026, 05:39:58 UTC. Solutions: USGS · CI (usgs:ci41569400). Cite as: SeismoAtlas, “M0.4 earthquake 34 km ENE of San Diego Country Estates, California, United States”, https://seismoatlas.com/earthquake/ci41569400-m0-4-earthquake-34-km-ene-of-san-diego-country-estates-california-united-states, data from USGS.

JSON: /api/v1/events/ci41569400. SeismoAtlas is not an official warning service.