A light magnitude 3.4 earthquake hit 58 km (36 mi) away from Anaheim, California, United States, in the afternoon of Tuesday, Aug 5, 2025 at 4.54 pm local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 6.7 km (4.1 mi) and was felt widely in the area.
Light magnitude 3.4 earthquake at 7 km depth
5 Aug 23:56 UTC: First to report: VolcanoDiscovery after 2 minutes.5 Aug 23:57: Now using data updates from USGS6 Aug 00:00: Magnitude recalculated from 3.6 to 3.4.6 Aug 01:08: Hypocenter depth recalculated from 5.80 to 6.66 km (from 3.6 to 4.1 mi). Epicenter location corrected by 0.6 km (0.4 mi) towards SSW.
Numerous people reported to have felt the quake. Attached is an updated map showing the shaking felt (and reported) by this earthquake.
Numerous people reported to have felt the quake. Attached is an updated map showing the shaking felt (and reported) by this earthquake.
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Earthquake details
Local time at epicenter | Tuesday, Aug 5, 2025, at 04:54 pm (America/Los Angeles GMT -7) |
Status | confirmed (manually revised) |
Magnitude | 3.4 |
Depth | 6.7 km |
Quality | 160 seismic stations |
Shaking intensity | IV Light shaking near epicenter |
Felt | 142 reports |
Weather at epicenter at time of quake | Smoke 32.9°C (91 F), humidity: 35%, wind: 7 m/s (14 kts) from W |
Estimated seismic energy released | 7.9 x 109 joules (2.21 megawatt hours, equivalent to 1.9 tons of TNT) | equivalent to ONE quake of magnitude 3.4 | about seismic energy |
Ground shaking from this quake
Nearby places
The closest larger town where the quake might have been felt is Riverside, a city with more than 320,000 inhabitants in the United States, in 21 km (13 mi) distance south of the epicenter. People likely experienced weak shaking there. Many smaller towns and villages are located closer to the epicenter and might have experienced stronger shaking.The following table shows some of the places that might have been affected (or not) by the shaking.
Place | Max. shaking intensity(*) | Country |
User-reports for this quake (149)
The first report about ground shaking reached us after only 2 minutes, before other agencies reported it. We received 149 reports for this quake from the United States. Out of these, 142 people indicated they felt it. The quake was reported to have been felt in up to approx. 30–80 km (18.6–50 mi) distance.
The majority of reports came from San Bernardino (27 reports), a city with more than 220,000 inhabitants in California in 12.2 km (8 mi) distance east of the epicenter, United States, Fontana (17 reports), a city with more than 210,000 inhabitants in 6.3 km (3.9 mi) distance south of the epicenter, and Riverside (14 reports) (21 km or 13 mi to the south). See the list of places where most people reported this quake further below.
Translate
Colton, San Bernardino, California (14.5 km SE of epicenter) [Map] / Light shaking (MMI IV) : Strong jolt then movement is lightly laterally, seemingly appearing to stop and then movement again lightly. Lasting seconds.My location is Colton , streets are Hunts Lane and Santa Fe Lane. | 2 users found this interesting.
Eastvale, California (24.9 km SW of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 5-10 s : Strong downward shake. | 2 users found this interesting. (reported through our app)
Colton, San Bernardino, California (9.7 km SE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 10-15 s : I was laying in bed and suddenly felt shaking. The bed was shaking and things were rattling around in the room.
Hesperia California (32.7 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / 2-5 s : I'fell one jump slow very slow and one sound like crack in side the house very very quiet and no other noise cuz I'm only person at home when happens!
2743 Reservoir Dr Norco CA 92860 (23.8 km S of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s : I was laying on my bed watching TV when a loud jolt or thump shook the whole house, like someone dropped something heavy against the wall. My cats instantly jolted alert watching the door thinking someone was trying to enter.
Brea, CA 92821 (50.2 km WSW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : I heard the building make a small boom like a door slamming, followed by light creaking and vibrations. The time was | One user found this interesting. (reported through our app)
Norco California (27.2 km SSW of epicenter) [Map] / Weak shaking (MMI III)
Fontana (8.3 km SSW of epicenter) [Map] / Weak shaking (MMI III) / 1-2 s
Eastvale (23.8 km S of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Eastvale, Riverside, California (24.3 km SW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s
Jurupa valley (28.7 km SE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / very short
san Diego,ca (154.9 km S of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
near San Diego, California (151.9 km S of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 minutes (reported through our app)
West Hollywood, Los Angeles, California (83 km W of epicenter) [Map] / not felt (reported through our app)
Rialto (12.2 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / vibration and rolling / 5-10 s
Fountain Valley, Orange, California (67.4 km SW of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Ladera Ranch, Orange, California (69.7 km SSW of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Chino (36 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short
Los Serranos, San Bernardino, California (33.8 km SW of epicenter) [Map] / not felt (reported through our app)
Watching tv (29.7 km WSW of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s
Eastvale, Riverside, California (24.4 km SW of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Norco California (27.2 km SSW of epicenter) [Map] / Weak shaking (MMI III)
Place | Distance from epicenter | Average reported Shaking Intensity | Nr. of reports |
---|
San Bernardino, California, United States | 12.2 km (8 mi) | III: Weak shaking | 27 |
Rialto, California, United States | 6 km (3.7 mi) | III: Weak shaking | 6 |
Chino, California, United States | 29 km (18 mi) | III: Weak shaking | 5 |
Eastvale, California, United States | 24 km (15 mi) | III: Weak shaking | 4 |
The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.Read more about the MMI scale!
Shaking intensity | Number of reports | Min-Max distance from epicenter (*) | Average distance (*) |
---|
I: Not felt | 6 | 34–89 km (21–55 mi) | 61 km (38 mi) |
II: Very weak shaking | 43 | 2.9–81 km (1.8–51 mi) | 30 km (19 mi) |
III: Weak shaking | 50 | 2.1–44 km (1.3–27 mi) | 15.5 km (10 mi) |
IV: Light shaking | 26 | 3.2–29 km (2–17.8 mi) | 13.2 km (8 mi) |
V: Moderate shaking | 4 | 7.6–16.4 km (4.7–10.2 mi) | 12.1 km (7 mi) |
Compare Quake Data
The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag | Depth | Time GMT2025-08-5 | Epicenter | Agency |
3.48 | 6.7 km4.1 mi±0.3 km | 23:54:37.3 | 6 km NW of Rialto, CAEpicenter uncertainty: ± 0.1 km | USGS (United States Geological Survey) |
3.5 | 6.7 km4.2 mi | 23:54:36.48±0.43s | GREATER LOS ANGELES AREA, CALIF.0 km (0 mi) epicenter difference with USGS | EMSC (European-Mediterranean Seismological Centre) |
3.5 | 6.7 km4.1 mi | 23:54:37 | SOUTHERN CALIFORNIA0 km (0 mi) epicenter difference with USGS | IRIS (Incorporated Research Institutions for Seismology) |
Earthquake statistics
Based on data from the past 55 years and our earthquake archive back to 1900, there are about 7,500 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
The area where this quake occurred has a very high level of seismic activity. It has had at least 2 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 60 to 65 years.
Previous quakes in the same area of this earthquake
The earthquake occurred 5 days after a magnitude 4.3 earthquake had hit on Thursday, Jul 31, 2025, at 09:32 am local time (America/Los Angeles GMT -7) in 0.3 km (0.2 mi) distance to the north: The largest quake near the epicenter of this quake during the 10 years before was an event of magnitude 7.1. It had occurred 6 years earlier, on Friday, Jul 5, 2019, at 08:19 pm local time (America/Los Angeles GMT -7) in California, United States: The strongest-ever (since 1900) recorded quake in this area measured magnitude 7.5. It had occurred 73 years ago earlier, on Monday, Jul 21, 1952, at 04:52 am local time (America/Los Angeles GMT -7) in California, United States: Below is a list and map of larger or recent quakes that had occurred near the epicenter before this earthquake (within up to 100 km/61 mi distance, up to 300 km/183 mi for very large quakes above mag. 7). Filter and sort the list by magnitude or time.
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Oldest quakes are shown in yellow, most recent in red.
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