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.

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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
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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.
Mag.DepthLocationSource
3.116 kmSOUTHERN CALIFORNIAEMSC
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.
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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
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