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Weak mag. 3.1 earthquake - 0.9 mi northwest of Hemet, Riverside County, California, USA, on Wednesday, Aug 4, 2021 at 11:51 pm (GMT -7)

Weak mag. 3.1 earthquake - 0.9 mi northwest of Hemet, Riverside County, California, USA, on Wednesday, Aug 4, 2021 at 11:51 pm (GMT -7) Weak mag. 3.1 earthquake - 0.9 mi northwest of Hemet, Riverside County, California, USA, on Wednesday, Aug 4, 2021 at 11:51 pm (GMT -7)

Weak magnitude 3.1 earthquake at 17 km depth

5 Aug 06:23 UTC: First to report: VolcanoDiscovery after 30 seconds.
6 Aug 06:19: Now using data updates from USGS
Update Thu, 5 Aug 2021, 06:57

Small tremor of magnitude 3.5 just reported 1 miles northwest of Hemet, California, United States

3.5 quake 4 Aug 11:51 pm (GMT -7)
3.5 quake 4 Aug 11:51 pm (GMT -7)
Just 6 minutes ago, a 3.5-magnitude earthquake struck near Hemet, Riverside County, California, USA. The tremor was recorded late at night on Wednesday 4 August 2021 at 11:51 pm local time, at a shallow depth of 11 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.5 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Hemet (pop. 83,900) located 1 miles from the epicenter, San Jacinto (pop. 47,000) 2 miles away, East Hemet (pop. 17,400) 3 miles away, Menifee (pop. 87,200) 10 miles away, Beaumont (pop. 43,800) 12 miles away, Perris (pop. 75,000) 14 miles away, Moreno Valley (pop. 204,200) 19 miles away, and Murrieta (pop. 109,800) 19 miles away. In Anaheim (pop. 350,700, 54 miles away), the quake was probably not felt.

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Earthquake details

Date & timeAug 5, 2021 06:51:30 UTC
Local time at epicenterWednesday, Aug 4, 2021 at 11:51 pm (GMT -7)
StatusConfirmed
Magnitude3.1
Depth17.4 km
Epicenter latitude / longitude33.75533°N / 116.98533°W (Riverside, California, United States)
Antipode33.755°S / 63.015°E
Shaking intensityWeak shaking
Felt274 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoLavic Lake (96 km / 60 mi)
Nearby towns and cities1 km (1 mi) NW of Hemet (pop: 83,900) | Show on map | Quakes nearby
4 km (3 mi) SW of San Jacinto (pop: 47,000) | Show on map | Quakes nearby
5 km (3 mi) WNW of East Hemet (pop: 17,400) | Show on map | Quakes nearby
15 km (9 mi) ENE of Menifee (pop: 87,200) | Show on map | Quakes nearby
19 km (12 mi) S of Beaumont (pop: 43,800) | Show on map | Quakes nearby
23 km (14 mi) E of Perris (pop: 75,000) | Show on map | Quakes nearby
30 km (19 mi) SE of Moreno Valley (pop: 204,200) | Show on map | Quakes nearby
31 km (19 mi) NE of Murrieta (pop: 109,800) | Show on map | Quakes nearby
44 km (27 mi) ESE of Riverside (pop: 322,400) | Show on map | Quakes nearby
672 km (418 mi) SE of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 25.7°C (78 F), humidity: 52%, wind: 2 m/s (3 kts) from SW
Estimated seismic energy released2.8 x 109 joules (783 kilowatt hours, equivalent to 0.674 tons of TNT) | about seismic energy
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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
3.117 kmNear San Bernardino, California, USAUSGS
3.022 kmSOUTHERN CALIFORNIAEMSC

Seismograms

Seismic station: Red Mountain, Riverside Co, CA, USA (RDM/AZ network) | Distance from quake: 19 km / 12 mi | Show on map | Station Info
Seismic station Red Mountain, Riverside Co, CA, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (289)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Menifee, Ca / Light shaking (MMI IV) / rattling, vibrating / very short : It was a very loud quick sound and jolt. I heard it from upstairs in my house and I thought someone was breaking in downstairs. | 3 users found this interesting.  
Menifee / Weak shaking (MMI III) / single vertical bump / 5-10 s : Heard vibration for a few seconds before feeling a single light jolt. Thought it might be a plane from March AFB flying over, until the jolt. Then knew it was an earthquake. | 2 users found this interesting.  
Hemet CA. / Light shaking (MMI IV) / vibration and rolling / 15-20 s : Jerk lcud noise almost like thunder. Then the windows were shaking slightly but I was sitting on the ground so I felt the whole thing. Well I felt the ground like a rolling towards the northwest direction My puppy was sleeping and he jumped up and was sca | 2 users found this interesting.  
  • We thought animals usually felt earthquakes before humans and reacted to them by behaving strangely or barking?
Hemet, CA / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : A low frequency rumble began on the west side of the house, around 23:55.. Approx 2 seconds after the rumbling began, the rumbling was stronger, as if it was building until “WHAM.” The single major “hit,” followed by another smaller, but very noti | 2 users found this interesting.  
  • Now we’re concerned; he hasn’t texted us back yet? That’s out of character for him not to respond. We pray that all is well?
  • We have a friend that happens to live in Hemet, CA! Will text him this morning to see if he felt anything?
Winches (26.8 km SSW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / very short : Single jolt felt as if quickly moving from approximately northeast to southwest at my location in Winchester. No residual shaking or movement. Noise similar to a loud bump from a heavy item dropped on the second floor above my position kn the first floor. | One user found this interesting.  
Winchester, CA. 92596 (10.9 km SW of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s : Felt a small jolt and the house creek a little bit. Followed 1.5 seconds later by a healthy, much stronger jolt that made a substantial boom in the walls of the house. Very quick jolt with no rolling characteristics. | One user found this interesting.  
31125 little Camille way (22.5 km WSW of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s : Slight shaking. I heard it more than anything, it sounded like a team I outside was going down my street really fast. | One user found this interesting.  
San Jacinto, Riverside, California (3.7 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / very short : Not bad | 2 users found this interesting.  
Temecula ca (25.6 km SSW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Woke me up from a sleep | 2 users found this interesting.  
Hemet, ca / Light shaking (MMI IV) / 1-2 s : Shook my bed while watching Clarkson's Farm. My wife felt it also as she closed the fridge thinking she slammed it. | One user found this interesting.  
Menifee, CA / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I thought it was the washing machine speeding up and giving a quick shake to my bed. Then realized the machine wasn’t on. | One user found this interesting.  
Perris California / Weak shaking (MMI III) / rattling, vibrating / very short : Light shaking with a low rumble noise all was very short maybe 2 seconds at the most | 2 users found this interesting.  
Hemet California / Very weak shaking (MMI II) / single vertical bump / 1-2 s : Felt a boom and a jerk. Fast | 2 users found this interesting.  
Hemet, Riverside, California (0.5 km SE of epicenter) [Map] / Very weak shaking (MMI II) / complex motion difficult to describe : There is more to come | One user found this interesting.  
Murrieta Hot Springs, Riverside, California (21.1 km SSW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : heard it before i felt it | One user found this interesting.  
Menifee (17.6 km SW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : Rumble | One user found this interesting.  
Temecula, Riverside, California (34.5 km SSW of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : Woke me up | One user found this interesting.  
Murrieta Hot Springs, Riverside, California (21.1 km SSW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : heard it before i felt it | One user found this interesting.  
Hemet (6.2 km SW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : I heard it before I felt it. | One user found this interesting.  
Riverside (42.8 km WNW of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / very short : Felt like a shock throughout the body | One user found this interesting.  
Elaine Blazek, West Hemet, CA 92545 / Light shaking (MMI IV) / vibration and rolling : Exactly 12:51pm I Heard and felt a loud thumping coming from West of my home. I was Sitting in a huge enclosing recliner that thumped up and down and vibrated. Sounded and felt like something huge hit my patio fence and West side of my living room! Knew i  
Jurupa valley / Moderate shaking (MMI V) / single vertical bump / very short : A strong jolt at my back..from a large living room Wall. Felt like coming from the south.im in juroy valley 1mile south of 60 frwy.  
Riverside, California / Light shaking (MMI IV) : I heard a weird noise then the house shook fast but it was short. I hope there isn’t any more earthquakes coming because they scare me a lot. Thank you for your time :)  
Hemet / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Heard a rattle coming then the house started to shake for a few seconds | One user found this interesting.  
Murrieta. CA / Very weak shaking (MMI II) : I was upstairs on 2nd floor in my bedroom on my chase lounge and my son was in his upper bunk bed. We felt an upward quick movement and as the movement came down you could feel an impact vibration with slight shift shake. In my opinion the quake was a lit | One user found this interesting.  
  • This is the first time we’ve heard a description of an earthquake such as yours. We hope that the seismologists are taking notes and will investigate these unusual earthquake tremors. Sounds very serious to us.
36175 alamar mesa dr, hemet, ca 92545 / Light shaking (MMI IV) / single vertical bump / 5-10 s : mild boom, then shaking that lasted for about 5-6 seconds | One user found this interesting.  
2197 larkspur ct San jacinto ca / Moderate shaking (MMI V) / single lateral shake / 2-5 s : Very loud hard shake. | One user found this interesting.  
WEST HEMET NEAR STETSON ANS SANDERSON / Very weak shaking (MMI II) / very short : A BUMP AND THEN ABOUT 5 QUICK SHAKES | One user found this interesting.  
Moreno Valley Ca / Moderate shaking (MMI V) / vertical swinging (up and down) / very short : Very short but powerful | One user found this interesting.  
Menifee CA / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : We heard it first then felt a light jolt. | One user found this interesting.  
Perris california / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : How strong it was because I felt 1 and a secons later i felt an other stronger than de firs one | One user found this interesting.  
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