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Light mag. 3.7 earthquake - 21 mi northeast of Casper, Natrona County, Wyoming, USA, on Sunday, Aug 1, 2021 at 9:50 pm (GMT -6) -

Light mag. 3.7 earthquake - 21 mi northeast of Casper, Natrona County, Wyoming, USA, on Sunday, Aug 1, 2021 at 9:50 pm (GMT -6) Light mag. 3.7 earthquake - 21 mi northeast of Casper, Natrona County, Wyoming, USA, on Sunday, Aug 1, 2021 at 9:50 pm (GMT -6)

Light magnitude 3.7 earthquake at 11 km depth

2 Aug 03:56 UTC: First to report: VolcanoDiscovery after 6 minutes.
2 Aug 04:06: Now using data updates from USGS
Update Mon, 2 Aug 2021, 04:12
Small 3.7 quake hits near Casper, Natrona County, Wyoming, USA
3.7 quake 1 Aug 9:50 pm (GMT -6)
3.7 quake 1 Aug 9:50 pm (GMT -6)
The United States Geological Survey reported a magnitude 3.7 quake in the United States near Casper, Natrona County, Wyoming, only 21 minutes ago. The earthquake hit in the evening on Sunday 1 August 2021 at 9:50 pm local time at a shallow depth of 7 miles. 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 3.7 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 Rolling Hills (pop. 440) located 7 miles from the epicenter, and Mercedes (pop. 2,600) 9 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Evansville (pop. 2,900) located 19 miles from the epicenter, Casper (pop. 60,300) 21 miles away, and Douglas (pop. 6,500) 32 miles away.

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Earthquake data

Date & time: Aug 2, 2021 03:50:46 UTC -
Local time at epicenter: Sunday, Aug 1, 2021 at 9:50 pm (GMT -6)
Magnitude: 3.7
Depth: 11.3 km
Epicenter latitude / longitude: 42.991°N / 105.9277°W (Converse, Wyoming, United States)
Antipode: 42.991°S / 74.072°E
Nearby towns and cities:
12 km (7 mi) NW of Rolling Hills (pop: 442) --> See nearby quakes!
34 km (21 mi) ESE of Antelope Hills (pop: 97) --> See nearby quakes!
34 km (21 mi) ENE of Casper (pop: 60,300) --> See nearby quakes!
43 km (27 mi) NE of Casper Mountain (pop: 401) --> See nearby quakes!
51 km (32 mi) WNW of Douglas (pop: 6,530) --> See nearby quakes!
92 km (57 mi) SSW of Wright (pop: 1,860) --> See nearby quakes!
131 km (82 mi) NW of Wheatland (pop: 3,660) --> See nearby quakes!
149 km (92 mi) SSW of Gillette (pop: 32,600) --> See nearby quakes!
171 km (107 mi) NE of Rawlins (Carbon County) (pop: 9,040) --> See nearby quakes!
189 km (117 mi) N of Laramie (pop: 32,200) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.2 x 1010 joules (6.22 megawatt hours, equivalent to 5.35 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
3.711 km11 Km NW of Rolling Hills, WyomingUSGS
3.711 kmWYOMINGEMSC

User reports for this quake (268)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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ROLLING HILLS, WYOMING / Light shaking (MMI IV) / 1-2 s : Felt like something ran into the side of house and made the house move with a loud thud | 7 users found this interesting.  
Evansville, Natrona, Wyoming (21.9 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : Our house shook enough to rock our couch and various other furniture. A side to side motion. As far as we know, there was only one. | 4 users found this interesting.  
Casper, Wyoming (37.9 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short : Weak | 3 users found this interesting.  
  • Casper,Wyoming single lateral shake, 5 sec. Rocked the recliner side to side and house made a cracking sound.
Casper (38.5 km WSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : Felt like a vehicle hit my house | 3 users found this interesting.  
CASPER (39.5 km WSW of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 2-5 s : No rolling. Short uptick vibration into a loud slam shake. Fort Casper by Fairground, Casper. Experienced Californian 4.0 with pre and post quakes under 3.0 | 3 users found this interesting.  
Casper, Natrona, Wyoming (35.6 km WSW of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s : It was shaking my truck | 2 users found this interesting.  
Casper,Wy / Weak shaking (MMI III) / single lateral shake / 1-2 s : A loud boom and the house shook once. I thought something had fallen on the roof. I went outside to check the house and the neighbors were all out checking their homes also. | One user found this interesting.  
Casper / Very weak shaking (MMI II) / rattling, vibrating / very short : Very slightly shook my house, only reason I prowling noticed was because a come hanging on a lampshade in my living room jingled | 2 users found this interesting.  
Shady lane, Evansville, Wyoming (23.8 km SW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Freaked the cat. We both felt it. Husband thought something hit the house. | 2 users found this interesting.  
Casper / Weak shaking (MMI III) / single vertical bump / 2-5 s : Felt like someone jumped on my house, maybe 2-3 seconds total | 2 users found this interesting.  
Glenrock, Wyo / Light shaking (MMI IV) / single vertical bump / 2-5 s : The whole house felt like it shifted in slow motion and was hit with something large. | 2 users found this interesting.  
Rolling Hills Wyoming / Weak shaking (MMI III) / very short : My daughter and I were downstairs watching tv/TikTok..the tv flickered and our furniture vibrated briefly. We both looked at each other and was like what the heck was that?!?! Really weird for sure!! | 2 users found this interesting.  
glenrock wyoming / Weak shaking (MMI III) / single lateral shake / 1-2 s : the house swug side to side for 2 seconds | 2 users found this interesting.  
Mercedes, Converse, Wyoming (16 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 2-5 s : Felt my hole house shake. I thought someone hit my house woke my daughter and her boyfriend up. | One user found this interesting.  
Evansville (31.7 km WSW of epicenter) [Map] / Weak shaking (MMI III) : Little shake and some objects moving in the house | One user found this interesting.  
near Evansville, Natrona, Wyoming (23.1 km SW of epicenter) [Map] / Light shaking (MMI IV) / complex motion difficult to describe / very short : Like being on a boat and a wave came underneath us. | One user found this interesting.  
Evansville, Natrona, Wyoming (32.8 km WSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / very short : Noise, brief shaking. | One user found this interesting.  
Casper, Natrona, Wyoming (43 km WSW of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s : Thought somebody hit the house | One user found this interesting.  
Mercedes, Converse, Wyoming (14.6 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : Heard it and felt it at the same time | One user found this interesting. (reported through our app)  
Casper, Natrona, Wyoming (43.8 km WSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Felt the whole house shake | One user found this interesting.  
Casper, WY / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Small shaking/vibrating with one large jolt (almost like something hit the building) then back to some small vibrations that faded away  
Casper, WY (38.5 km WSW of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short : The floor of the house shook briefly, like a sonic boom | One user found this interesting.  
casper wyoming / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : just a little shake | One user found this interesting.  
828 Sally Ln, Casper, Wyoming / Very weak shaking (MMI II) / single vertical bump / very short : It felt like something hit our house. | One user found this interesting.  
Evansville, Wy (23.6 km WSW of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s : Felt the bed jolt like someone hit it from the south end. Wasnt quite sure what it was until this morning. It was very brief. | One user found this interesting.  
Casper, Wy / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : We were in the basement. Sounded like a boom and then we felt shaking...we dismissed it as a big truck with the bass on very loud on their stereo. | One user found this interesting.  
Natrona County 12th and CY / Weak shaking (MMI III) / rattling, vibrating / very short : My whole house shook. Everyone in the house felt it. | One user found this interesting.  
Casper / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : I was very surprised by the shaking of the whole house. I went outside because I thought something hit the house. | One user found this interesting.  
Casper / Very weak shaking (MMI II) / very short : Just felt a shift | One user found this interesting.  
2130 Glendale ave casper wy (35.9 km WSW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s : Laying in bed felt like wave passed through the house. We got up, neighbors said they felt it to. Wife became nausea afterwards. | One user found this interesting.  
Casper, Wyoming / Light shaking (MMI IV) / single lateral shake / 2-5 s : A sudden intense jolt, and then a very short duration of rattling furniture. | One user found this interesting.  
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