Quake status: unconfirmed
This record is considered not to be from an actual earthquake, because there is no officially confirmed quake that matches the user reports we received of the reported event closely enough.
In most cases, this event likely reflects something else that caused shaking, such as an explosion (typical for mining areas), a sonic boom, traffic, weather, or some other human or natural cause.
The initial report is below:

Sismo non confermato: Utah, USA, Wed, 3 Mar 2021 03:03 -

Our monitoring service AllQuakes received reports of an earthquake in or near Utah, USA at around 03:03 GMT. Unless confirmed by at least one national or international seismological agency, its status remains unconfirmed.
Sismo non confermato: Utah, USA, Wed, 3 Mar 2021 03:03
3 Mar 03:05 UTC: Primo a segnalare: VolcanoDiscovery dopo 2 minuti.
Data & ora: 3 Mar 2021 03:03:31 UTC -
Ora locale a epicentro: mercoledì, 3 mar 2021 03:03 (GMT +0)
Magnitudine: sconosciuto
Profondità: 10.0 km
Epicentro latitudine / longitudine: 39.25024°N / 111.75103°W (Stati Uniti)
Vulcano più vicino: Black Rock Desert (72 km / 45 mi)
Fonte dati primaria: VolcanoDiscovery
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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.
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User reports for this quake (88)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Cottonwood Heights Utah / Very weak shaking (MMI II) / very short : At 8:03 we heard two booms and slight shaking. | 4 users found this interesting.  
84092 / Very weak shaking (MMI II) / very short : The whole house made a large thud noise, the windows and house then made settling noises/creaks afterwards. | 2 users found this interesting.  
West Jordan / Very weak shaking (MMI II) / very short : We heard this more than felt it. No damage. | One user found this interesting.  
West Jordan / Light shaking (MMI IV) / horizontal (sideways) swinging / very short : Sounded like someone was running through the house at fast speed | One user found this interesting.  
Salt Lake City 84105 / Weak shaking (MMI III) / 1-2 s : Loud bang, slight shake | One user found this interesting.  
Murray, UT 84107 / not felt / complex motion difficult to describe
West Jordan 11:56pm 3/3/2021 / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s : West Jordan 11:56pm 3/3/2021 Felt shaking heard vibrations  
Stansbury Park / Light shaking (MMI IV) / rattling, vibrating / 10-15 s
Ogden UT / Very weak shaking (MMI II) / very short : It felt like a rattle... I just it was me at 3 in the morning feeling my body waking up but it wasn’t normal so I checked the hr went back to bed did not think much since it was quick  
Provo Utah / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s
Millcreek / Light shaking (MMI IV) / 1-2 s : House roof made loud creaking sound and door rattled.  
West jordan Utah / not felt
west jordan / Weak shaking (MMI III) / rattling, vibrating / very short
Taylorsville / Very weak shaking (MMI II)
Murray (157.7 km N of epicenter) [Map] / not felt
174.7 km N of epicenter [Map] / Moderate shaking (MMI V)
Murray / Very weak shaking (MMI II) / single lateral shake / very short : Very short shake. Heard something, almost sounded like someone fell against something. Dog freaked out.  
West Jordan / Very weak shaking (MMI II) / 1-2 s
Salt Lake City / Light shaking (MMI IV) / single lateral shake / very short
West Valley City / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s : I was trying to sleep when I felt my body and bed slightly shake.  
108.6 km N of epicenter [Map] / Light shaking (MMI IV)
SALT LAKE CITY / Moderate shaking (MMI V) : My dresser doors were opened and it woke me up!  
West Valley City (1.8 km N of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / very short
South Jordan Utah / Weak shaking (MMI III) / single lateral shake
149.7 km N of epicenter [Map] / Weak shaking (MMI III) : Two large thuds very short and close to6  
153.7 km N of epicenter [Map] / Light shaking (MMI IV) / vibration and rolling / 15-20 s
Draper, Utah / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : House shook for a short time  
Spanish Fork / Very weak shaking (MMI II) / rattling, vibrating / very short
Provo / Very weak shaking (MMI II) / 1-2 s
North SALT LAKE / Light shaking (MMI IV) / 2-5 s
Lehi, UT / not felt : I was driving. I did not feel anything, however my husband in Orem,UT did mention something.  
SANDY / Very weak shaking (MMI II) / very short
Taylorsville / Weak shaking (MMI III) / single vertical bump / 1-2 s
Riverton utah / not felt
South Jordan / Light shaking (MMI IV) / single lateral shake / 1-2 s
Taylorsville / not felt / very short : Nothing happened  
West Valley City / Very weak shaking (MMI II) / very short
Fair park, UT (170.9 km N of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / very short
West Valley City / Weak shaking (MMI III) / rattling, vibrating
182.7 km NNW of epicenter [Map] / Very weak shaking (MMI II) / very short : Quick shake and slight noise  
Draper / Weak shaking (MMI III) / 1-2 s : House shook  
Bountiful / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Wanship / Very weak shaking (MMI II) / 1-2 s : I called my friend to tell him that the mountain made a boom noise and the whole house shook.  
Draper / not felt / very short : House rumbled  
142.7 km N of epicenter [Map] / Light shaking (MMI IV) : Heard a loud noise and shaking. And right after another but stronger. Shook house  
Salt Lake City / Very weak shaking (MMI II) / single lateral shake : A sort of rumbling, and short boom maybe? . .creaking, and what sounded like pitbull sized squirrels running across the roof. . .and that "hairs standing on end" is this an earthquake? sensation.  
157 km N of epicenter [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
West Valley (160.1 km N of epicenter) [Map] / Very weak shaking (MMI II)
156.9 km N of epicenter [Map] / Light shaking (MMI IV) / single lateral shake / very short
West Jordan / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
Sandy, Utah / Very weak shaking (MMI II)
Draper, utah / Light shaking (MMI IV) / single vertical bump / 1-2 s : Noise like blasts from Camp Williams unusual for earthquake  
West jordan / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Cottonwood Heights / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s
Draper / Very weak shaking (MMI II) / very short : I live by a train and the train never NEVER shakes the doors and this did  
157.2 km N of epicenter [Map] / Weak shaking (MMI III) / single vertical bump / 1-2 s
Sandy, ut (146.2 km N of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / 1-2 s
SALT LAKE CITY / Very weak shaking (MMI II) / single vertical bump / very short
Sandy / Weak shaking (MMI III)
Taylorsville utah / Very weak shaking (MMI II) / single lateral shake / very short
84123 (11.9 km N of epicenter) [Map] / Light shaking (MMI IV)
Midvale / not felt
149.7 km N of epicenter [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s
164.6 km N of epicenter [Map] / Weak shaking (MMI III) / vibration and rolling / 2-5 s
Provo / Weak shaking (MMI III) / rattling, vibrating : Short shaking  
West jordan / not felt / very short
156 km N of epicenter [Map] / Light shaking (MMI IV)
Riverton / Very weak shaking (MMI II) / vibration and rolling : 2 separate rumblings. Sounded like an earthquake was surprised I didn’t feel much because it was loud.  
Salt lake city / Very weak shaking (MMI II) / single vertical bump / very short
Taylorsville utah / Very weak shaking (MMI II) : Daughter asked what was shaking & I thought it was a car stereo, then a friend nearby asked if I felt shaking  
Draper, UT / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
West Valley City, 84119 / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
T (157.8 km N of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short
West Jordan, UT / not felt / rattling, vibrating / very short : Heard a short rumble, didn't feel shaking.  
164.6 km N of epicenter [Map] / Light shaking (MMI IV)
Murray / Light shaking (MMI IV) / very short
West valley utah / Weak shaking (MMI III) / very short
Cottonwood heights, ut / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Taylorsville / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Thought I was crazy for a moment, then I got a few texts asking if I felt a shaking.  
Cedar Hills (128.3 km N of epicenter) [Map] / Weak shaking (MMI III)
Sandy, Utah / Weak shaking (MMI III)
South Jordan / Light shaking (MMI IV) / single vertical bump / 1-2 s
Salt Lake City / Very weak shaking (MMI II) / very short
Sandy / Light shaking (MMI IV) / vibration and rolling / 2-5 s
West Jordan / Very weak shaking (MMI II)
Salt Lake City / Very weak shaking (MMI II)
West Jordan, Utah / not felt / very short : Sounded like a stiff gust of wind creeking the house for a second.  
Herriman, Utah / Very weak shaking (MMI II) / single vertical bump / very short
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