M3.5 earthquake 9 km NNE of Delta, Baja California, Mexico

A magnitude 3.5 earthquake struck 9 km NNE of Delta, Baja California, Mexico at 10:17 local time (18:17 UTC) on 3 Nov 2026, at a depth of 16 km, according to USGS.

revised from M3.8 · 2 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-11-04 18:53 UTC · reviewed

Magnitude: 3.5minor
local magnitude (Richter) (ml)
revised from 3.8
Depth: 16.5 km
Status: Reviewed
Origin time: 2026-11-03 18:17:13 UTC; Local: 3 Nov 2026, 10:17:13 (America/Tijuana)
Epicentre: 32.421° N, 115.165° 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
DeltaBaja California, Mexico · pop. 5,180	9 km	IIIWeak
Ciudad Guadalupe VictoriaBaja California, Mexico · pop. 17,119	16 km	IIIWeak
MexicaliBaja California, Mexico · pop. 1,032,686	35 km	IIWeak
San LuisArizona, United States · pop. 31,520	37 km	IIWeak
San Luis Río ColoradoSonora, Mexico · pop. 176,685	37 km	IIWeak
CalexicoCalifornia, United States · pop. 40,053	43 km	IIWeak
EnsenadaBaja California, Mexico · pop. 443,807	148 km	INot felt
TijuanaBaja California, Mexico · pop. 1,922,523	172 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. Likely felt out to about 19 km.

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	3.5 mlwas 3.4	16.5 km	32.42° N, 115.16° W	–	Reviewed · 4 revisions

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 2.4 t 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 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M3.5 with M2.5

M3.5 releases about 29× the energy of M2.5, and its waves are about 9.3× taller on a seismogram. Energy: 2.4 t of TNT vs 85 kg of TNT.

Each square is the energy of one M2.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

19 later earthquakes within 30 km; the largest was M4.9 9 days ago. 19 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.5

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

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
0.17	4.9	16
0.42	2.2	16
0.42	2.2	12
0.50	1.8	13
1.02	3.0	16
1.08	1.9	19
1.30	2.1	16
1.31	2.5	15
1.53	1.3	15
1.54	2.0	12
1.99	2.2	14
2.01	2.0	12
3.57	2.1	15
4.29	2.1	20
6.56	1.6	11
7.92	1.8	13
52.38	2.3	11
187.10	1.8	20
187.69	2.0	19

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.

USGS “Did You Feel It?” has 2 reports: add yours at USGS.

Event id ew1793729840. First recorded here 3 Nov 2026, 18:18:21 UTC. Solutions: USGS · CI (usgs:ci41572056). Cite as: SeismoAtlas, “M3.5 earthquake 9 km NNE of Delta, Baja California, Mexico”, https://seismoatlas.com/earthquake/ew1793729840-m3-5-earthquake-9-km-nne-of-delta-baja-california-mexico, data from USGS.

JSON: /api/v1/events/ew1793729840. SeismoAtlas is not an official warning service.