M2.5 earthquake 76 km WSW of Richfield, Utah, United States

Name: M2.5 earthquake 76 km WSW of Richfield, Utah, United States
Start: 2026-09-03T18:07:08.670Z
End: 2026-09-03T18:07:08.670Z
Location: 76 km WSW of Richfield, Utah, United States

A magnitude 2.5 earthquake struck 76 km WSW of Richfield, Utah, United States at 12:07 local time (18:07 UTC) on 3 Sept 2026, at a depth of 1 km, according to USGS.

Data: USGS · updated 2026-09-15 17:33 UTC · reviewed

Magnitude: 2.5micro
local magnitude (Richter) (ml)
Depth: 1.4 km
Status: Reviewed
Origin time: 2026-09-03 18:07:08 UTC; Local: 3 Sept 2026, 12:07:08 (America/Denver)
Epicentre: 38.525° N, 112.898° 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
RichfieldUtah, United States · pop. 7,592	76 km	INot felt
EnochUtah, United States · pop. 6,265	85 km	INot felt
Cedar CityUtah, United States · pop. 30,184	95 km	INot felt
Las VegasNevada, United States · pop. 641,903	328 km	INot felt
HendersonNevada, United States · pop. 285,667	332 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 10 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 · UU, which has been reviewed by an analyst.

Agency	Magnitude	Depth	Epicentre	Time offset	Status
USGS · UUheadlineUniversity of Utah Seismograph Stations via U.S. Geological Survey	2.5 ml	1.4 km	38.52° N, 112.90° W	–	Reviewed

How big was it?

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

It released roughly the energy of 91 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 1 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M2.5 with M1.5

M2.5 releases about 34× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 91 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

26 later earthquakes within 30 km; the largest was M3.1 16 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
130.84	2.5	2
220.76	3.1	4
289.28	2.6	3
438.17	0.4	2
438.96	1.4	3
439.67	1.4	3
439.88	1.3	3
441.87	1.1	3
442.15	1.2	3
443.64	1.1	3
445.97	1.9	2
446.79	1.0	1
446.90	1.6	2
447.65	1.8	3
448.90	1.3	3
449.95	1.8	2
452.11	1.0	3
452.57	1.0	2
460.63	0.9	1
494.00	2.1	3
498.49	1.5	4
500.03	1.8	5
507.22	1.9	3
526.44	1.1	4
528.49	1.3	2
592.14	1.2	4

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id uu80153911. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · UU (usgs:uu80153911). Cite as: SeismoAtlas, “M2.5 earthquake 76 km WSW of Richfield, Utah, United States”, https://seismoatlas.com/earthquake/uu80153911-m2-5-earthquake-76-km-wsw-of-richfield-utah-united-states, data from USGS.

JSON: /api/v1/events/uu80153911. SeismoAtlas is not an official warning service.