Light mag. 3.3 earthquake - 17 mi southeast of Hemet, Riverside County, California, USA, on Tuesday, Sep 21, 2021 3:57 pm (GMT -7) -

Light mag. 3.3 earthquake - 17 mi southeast of Hemet, Riverside County, California, USA, on Tuesday, Sep 21, 2021 3:57 pm (GMT -7)

Light magnitude 3.3 earthquake at 13 km depth

21 Sep 23:00 UTC: First to report: USGS after 3 minutes.
21 Sep 23:41: Magnitude recalculated from 3.5 to 3.3. Hypocenter depth recalculated from 13.5 to 13.4 km (from 8.4 to 8.3 mi).
Update Tue, 21 Sep 2021, 23:09
Small 3.5 quake hits near Hemet, Riverside County, California, USA
3.5 quake 21 Sep 3:57 pm (GMT -7)
3.5 quake 21 Sep 3:57 pm (GMT -7)
A magnitude 3.5 earthquake near Hemet, Riverside County, California, USA, was reported only 12 minutes ago by the United States Geological Survey, considered the key international and national agency that monitors seismic activity in the US. The earthquake occurred at a shallow depth of 8.4 miles beneath the epicenter early afternoon on Tuesday, September 21st, 2021, at 3:57 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.5 as well.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Mountain Center (pop. 63) located 5 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Palm Springs (pop. 47,400) located 17 miles from the epicenter, Hemet (pop. 83,900) 17 miles away, Cathedral City (pop. 53,800) 17 miles away, San Jacinto (pop. 47,000) 18 miles away, Palm Desert (pop. 51,900) 20 miles away, Menifee (pop. 87,200) 26 miles away, and Temecula (pop. 112,000) 27 miles away. In Riverside (pop. 322,400, 45 miles away), the quake was probably not felt.

Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online:
Android | iOS

Earthquake data

Date & time: Sep 21, 2021 22:57:32 UTC -
Local time at epicenter: Tuesday, Sep 21, 2021 3:57 pm (GMT -7)
Magnitude: 3.3
Depth: 13.4 km
Epicenter latitude / longitude: 33.63467°N / 116.71083°W (Riverside, California, United States)
Antipode: 33.635°S / 63.289°E
Nearest volcano: Salton Buttes (112 km / 70 mi)
Nearby towns and cities:
8 km (5 mi) S of Mountain Center (pop: 63) --> See nearby quakes!
24 km (15 mi) ESE of East Hemet (pop: 17,400) --> See nearby quakes!
27 km (17 mi) SW of Palm Springs (pop: 47,400) --> See nearby quakes!
27 km (17 mi) ESE of Hemet (pop: 83,900) --> See nearby quakes!
28 km (17 mi) SW of Cathedral City (pop: 53,800) --> See nearby quakes!
28 km (18 mi) SE of San Jacinto (pop: 47,000) --> See nearby quakes!
32 km (20 mi) WSW of Palm Desert (pop: 51,900) --> See nearby quakes!
37 km (23 mi) W of La Quinta (pop: 40,500) --> See nearby quakes!
73 km (45 mi) ESE of Riverside (pop: 322,400) --> See nearby quakes!
698 km (434 mi) SE of Sacramento (pop: 490,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 28.6°C (83 F), humidity: 21%, wind: 1 m/s (2 kts) from WSW
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5.6 x 109 joules (1.56 megawatt hours, equivalent to 1.34 tons of TNT) More info
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
If you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable to earthquake science, seismic hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: 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.
3.313 km9km NNW of Anza, CAUSGS

User reports for this quake (9)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
escondido (64.1 km SSW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 1-2 s
4s ranch (78.7 km SSW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s
Oceanside / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Oceanside / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Hemet / Very weak shaking (MMI II) (reported through our app)
Idyllwild / Light shaking (MMI IV) / rattling, vibrating / very short : It felt like something heavy fell in the house.  
Murrieta / Weak shaking (MMI III) / very short (reported through our app)
ANAHEIM / not felt
Winchester,CA / Weak shaking (MMI III) / rattling, vibrating / very short
Volcanoes & Earthquakes - new app for Android

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.