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Event status: unconfirmed [?]

Reported quake or seismic-like event: 3.6 mi east of Murrieta, Riverside County, California, USA, Thursday, Aug 5, 2021 at 12:07 pm (GMT -7)

Reported quake or seismic-like event: 3.6 mi east of Murrieta, Riverside County, California, USA, Thursday, Aug 5, 2021 at 12:07 pm (GMT -7) Reported quake or seismic-like event: 3.6 mi east of Murrieta, Riverside County, California, USA, Thursday, Aug 5, 2021 at 12:07 pm (GMT -7)
5 Aug 19:15 UTC: First to report: VolcanoDiscovery after 8 minutes.

Earthquake details

Date & timeAug 5, 2021 19:07:18 UTC
Local time at epicenterThursday, Aug 5, 2021 at 12:07 pm (GMT -7)
Statusunconfirmed
Magnitudeunknown (3.2?)
Depth10.0 km
Epicenter latitude / longitude33.56851°N / 117.15401°W (Riverside, California, United States)
Antipode33.569°S / 62.846°E
Shaking intensityWeak shaking
Felt37 reports
Primary data sourceVolcanoDiscovery (User-reported shaking)
Nearest volcanoLavic Lake (141 km / 88 mi)
Nearby towns and cities1 km (1 mi) NNE of Murrieta Hot Springs (pop: 3,640) | Show on map | Quakes nearby
6 km (4 mi) ENE of Murrieta (pop: 109,800) | Show on map | Quakes nearby
8 km (5 mi) N of Temecula (pop: 112,000) | Show on map | Quakes nearby
12 km (8 mi) ESE of Wildomar (Riverside County) (pop: 35,600) | Show on map | Quakes nearby
18 km (11 mi) S of Menifee (pop: 87,200) | Show on map | Quakes nearby
19 km (12 mi) SE of Lake Elsinore (pop: 62,000) | Show on map | Quakes nearby
25 km (15 mi) SSE of Perris (pop: 75,000) | Show on map | Quakes nearby
26 km (16 mi) SW of Hemet (pop: 83,900) | Show on map | Quakes nearby
76 km (47 mi) ESE of Anaheim (pop: 350,700) | Show on map | Quakes nearby
680 km (423 mi) SE of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 31.2°C (88 F), humidity: 31%, wind: 2 m/s (3 kts) from SSW
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Seismograms

Seismic station: Murrieta (MUR/CI network) | Distance from quake: 5 km / 3 mi | Show on map | Station Info
Seismic station Murrieta: 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 (40)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Murrieta / Light shaking (MMI IV) : Heard loud boom, as if something heavy fell on house roof | 2 users found this interesting.  
Murrieta, Ca (3.9 km W of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short : One single lateral jolt, just strong enough to know it wasn’t me moving around. | 2 users found this interesting.  
Stanford Drive Temecula CA / Very weak shaking (MMI II) / single vertical bump / 1-2 s : Loud noise | One user found this interesting.  
Murrieta CA / Very weak shaking (MMI II) / single vertical bump / 1-2 s : It sounded like a somewhat close explosion and/or car hitting our home. It was loud and no shaking. | One user found this interesting.  
Murrieta ca / Light shaking (MMI IV) / single vertical bump / 1-2 s : It was like a jolt. Sounded like a BANG! | One user found this interesting.  
House (5 km SE of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / 1-2 s : It was a quick loud noise. I didn’t really feel it only heard it. It sounded like a door being slammed shut. | One user found this interesting.  
Murrieta / Very weak shaking (MMI II) / single vertical bump / very short : 1 single thump | One user found this interesting.  
Murrieta / Light shaking (MMI IV) : Heard loud boom, as if something heavy fell on house roof | One user found this interesting.  
Murrieta / Light shaking (MMI IV) : Heard loud boom, as if something heavy fell on house roof | One user found this interesting.  
Temecula / Light shaking (MMI IV) / single vertical bump / very short : Felt like someone picked up house and dropped it! | One user found this interesting.  
BANNING / not felt : my sister lives in Murrieta, she thinks since theres a boom involved it might be something from camp pendleton, maybe a sonic boom of some sort | One user found this interesting.  
Murrieta, ca / Very weak shaking (MMI II) / single vertical bump / very short : Heard loud boom and brief/strong bump. | One user found this interesting.  
Murrieta, CA / Light shaking (MMI IV) / single lateral shake / 1-2 s : It felt like a quick, strong jolt, with rumbling sound, almost like thunder | One user found this interesting.  
Temecula / Weak shaking (MMI III) / single lateral shake / very short : Short burst of shaking | One user found this interesting.  
MURRIETA / Moderate shaking (MMI V) / single lateral shake / 1-2 s : One large boom or jolt with noise | One user found this interesting.  
Home (4.6 km NW of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / very short : Endow rattle. Quick jolt | One user found this interesting.  
Murrieta (1.1 km E of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / very short : Felt and sounded almost like a sonic boom or explosion. | One user found this interesting.  
Murrieta, Riverside, California (6.2 km WNW of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / 1-2 s
Menifee / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Heard it, felt slight shake  
Murrieta / Weak shaking (MMI III) / single lateral shake / very short
Temecula California / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Rumbling sound and shaking while I was lying in bed. And a loud booms all at the same time. And it felt like it was in a straight line. I’ve lived in California all my life lm now 69 and this one was the strangest earthquake ever!!  
House cleaning / Light shaking (MMI IV) / single vertical bump
92592 / not felt
Menifee / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Heard it, felt slight shake  
Murrieta / Weak shaking (MMI III) / single lateral shake / 1-2 s
Temecula / Very weak shaking (MMI II) / single vertical bump / very short : One single boom and jolt. Shook my house like a big slamming door sound.  
Murrieta / not felt : Loud boom  
Murrieta, ca / Very weak shaking (MMI II) / single vertical bump / very short : Heard loud boom and brief/strong bump.  
33444 Alagon street Temecula / Very weak shaking (MMI II) / single vertical bump / very short
Murrieta / Very weak shaking (MMI II) / single vertical bump / very short : Felt like explosion  
Temecula, ca / Very weak shaking (MMI II) / very short : Felt like a loud boom, like camp Pendleton training exercises  
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