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Event status: unconfirmed [?]

Reported quake or seismic-like event: 4.5 mi west of Norwich, New London County, Connecticut, USA, Wednesday, Nov 17, 2021 at 10:07 pm (GMT -5)

Reported quake or seismic-like event: 4.5 mi west of Norwich, New London County, Connecticut, USA, Wednesday, Nov 17, 2021 at 10:07 pm (GMT -5) Reported quake or seismic-like event: 4.5 mi west of Norwich, New London County, Connecticut, USA, Wednesday, Nov 17, 2021 at 10:07 pm (GMT -5)
18 Nov 03:20 UTC: First to report: VolcanoDiscovery after 12 minutes.

Earthquake details

Date & timeNov 18, 2021 03:07:45 UTC
Local time at epicenterWednesday, Nov 17, 2021 at 10:07 pm (GMT -5)
Statusunconfirmed
Magnitudeunknown (3.8?)
Depth10.0 km
Epicenter latitude / longitude41.52997°N / 72.16165°W (New London, Connecticut, United States)
Antipode41.53°S / 107.838°E
Shaking intensityWeak shaking
Felt163 reports
Primary data sourceVolcanoDiscovery (User-reported shaking)
Nearby towns and cities7 km (4 mi) W of Norwich (pop: 39,900) | Show on map | Quakes nearby
19 km (12 mi) S of wyndham knktykt (pop: 23,100) | Show on map | Quakes nearby
20 km (12 mi) NNW of New London (pop: 27,200) | Show on map | Quakes nearby
20 km (13 mi) S of Willimantic (pop: 17,700) | Show on map | Quakes nearby
21 km (13 mi) N of Waterford (pop: 19,300) | Show on map | Quakes nearby
27 km (17 mi) SSE of Mansfield City (pop: 26,400) | Show on map | Quakes nearby
41 km (25 mi) E of Middletown (pop: 46,800) | Show on map | Quakes nearby
47 km (29 mi) SE of East Hartford (pop: 51,300) | Show on map | Quakes nearby
51 km (31 mi) ESE of Hartford (pop: 124,000) | Show on map | Quakes nearby
507 km (315 mi) NE of Washington (District of Columbia) (pop: 601,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 8.6°C (47 F), humidity: 76%, wind: 3 m/s (5 kts)
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User reports for this quake (218)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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From Bolton, MA near border with Stow, MA this doo (113.4 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / very short : From Bolton, MA near border with Stow, MA this doorbell video shows flash of light in sky at 10:07:51 PM then a loud boom 19-20 seconds later. Video in link: | 9 users found this interesting.  
  • Video please?!?! I saw a bright flash of light over Worcester Airport last week and want to see if it's similar.
  • Where is video!
  • Here’s a video that was posted on Nextdoor from someone in Bolton of a flash of light followed by the loud boom:
  • That earthquake was first listed as a 4.6! Just like the other ones listed in Tennessee and Missouri those were 5s at first and there was a 5 listed in Arkansas as well. They were all downgraded. USGS is lying to all of us.
  • Where can we see your video?
Maynard, ma (116.1 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / very short : I heard a loud boom and felt one minor rattle in the house. It felt like something big fell nearby. One and done, not sustained. | 8 users found this interesting.  
Stow Massachusetts / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Sounded like an explosion nearby and in our neighborhood. Shook the house. Called neighbors who all confirmed the same thing. We all look around our property to see if anything had literally blown up because it all felt so close. | 5 users found this interesting.  
Acton, MA / Very weak shaking (MMI II) / very short : Mostly acoustic. More like an intense clap of thunder from a distance. Seemed to have three peaks, of differing amplitude, in very rapid succession. You need to add "acoustic" to your list of what was felt. | 3 users found this interesting.  
Sudbury, Middlesex, Massachusetts (111.7 km NNE of epicenter) [Map] / not felt : Heard loud boom at 10:07. Looked out window facing south, expecting light or fire but all seemed normal | 2 users found this interesting.  
Stow MA (113.2 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / very short : I heard a loud explosion at 10:08pm. An observer in Bolton MA recorded a bright flash in the sky as well | 2 users found this interesting.  
Marlborough, MA (near Sudbury, MA, town line) / not felt : Standing outside after 10:00 PM. Object flew overhead, going rapidly northeast. Very brief, less than a second across sky but bright. What appeared to be "sparks" trailed off behind then burned out. Roughly 75 seconds later muffled boom between a "cannon | 2 users found this interesting.  
3 Taylor Rd Maynard,MA / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Heard a loud boom and the floor rattled. I thought a house was exploding again which happened 2 months ago. | 2 users found this interesting.  
Stow, MA (113.6 km NNE of epicenter) [Map] / not felt : Heard a muffled explosion coming from the East, which is the opposite direction from where sounds of explosions usually come from when Fort Devens is doing training activities. | One user found this interesting.  
Brookline, Norfolk, Massachusetts (125.1 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : weak to light shaking for about 2 minutes in small bursts of 15-20 seconds, horizontal swaying motion, lights and water glasses rattleing but no disturbance to furniture or dizziness. | One user found this interesting.  
73 Concord street Maynard, MA (117.4 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / very short : I heard more of an explosion than feeling shaking. I have felt earthquakes in OH and MA in my lifetime but this was less shaking. Surprised its a seismic event from geologic activity. | 3 users found this interesting.  
Harvard, MA / Light shaking (MMI IV) / single vertical bump / 1-2 s : Significant single boom, sounded like a single large explosion or ground impact, and felt a strong jolt. My dog was sleeping and jumped up, startled. | One user found this interesting.  
Stow, MA / Light shaking (MMI IV) / single vertical bump / very short : It felt like one big boom. Almost like a huge explosion that at first I thought happened in my own home. | One user found this interesting.  
Harvard, MA / Very weak shaking (MMI II) / rattling, vibrating / very short : We heard what sounded like an explosion which rattled the whole house. It was over in an instant. Did not feel like an earthquake to us. We originally thought it was ordinance at Ft Devens but the range report showing no activity on 11/17. | One user found this interesting.  
Stow / Light shaking (MMI IV) / single vertical bump / very short : It felt like a snap, like a door slammed shut, but the concussion was strong enough I knew it was an earthquake. It felt a lot like the jolts I remember from Washington State prior to Helen’s erupting. There was a rumble a millisecond after the jolt. We | One user found this interesting.  
Maynard, MA (115.5 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Very loud explosion that shook the house. Startled my wife and I. Was waiting for sirens afterward but they never came.  
Robert Road, Stow, MA (112.1 km NNE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Very loud boom/crash. Sounded like someone crashed through my garage or my roof slid off. House vibrated.  
Wayland, MA (117.1 km NE of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : I got an audio recording of the boom from my wildlife camera. No visible shaking of the picture. There were two short bursts and then a longer rumble starting at 10:08:28 local time.  
Lake Boon, Stow MA (111.4 km NNE of epicenter) [Map] / not felt / rattling, vibrating / 5-10 s : It sounded like there was an explosion next door. The house shook. Shortly before it, there was another much quieter bang that sent the dog running.  
North Sudbury, MA / not felt / very short : I didn’t feel any quake/shaking or vibrating—just an extremely loud/gigantic “boom!” | 2 users found this interesting.  
Acton, ma / not felt / 1-2 s : Heard muffled explosion, might have felt vibration. My dog barked like crazy. | 2 users found this interesting.  
170 N Shore Drive Stow MA / Weak shaking (MMI III) / single vertical bump / very short : Loud bang and house shook | 2 users found this interesting.  
Harvard ma / Light shaking (MMI IV) / 2-5 s : Sounded and felt like thunder but quicker. One jarring quick boom | 2 users found this interesting.  
Wayland, MA (115.3 km NE of epicenter) [Map] / Very weak shaking (MMI II) / very short : No shaking. I heard a “boom” type sound. My husband had dozed off and was woken up by this. | One user found this interesting.  
295 cox st, Hudson, ma (109.4 km NNE of epicenter) [Map] / not felt : Only heard it, sounded like an explosion. Others in area have security camera footage of a flash. | One user found this interesting.  
Stow, ma (117.3 km NNE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / very short : Loud boom! Sounded like an explosion. | One user found this interesting.  
Stow, ma (113 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 2-5 s : Like a large explosion in the air overhead, house shook slightly. Very brief. Saw nothing. | One user found this interesting.  
Stow Massachusetts, USA (111.9 km NNE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 s : From inside house: Heard a loud bang and house shook. | One user found this interesting.  
Mystic CT / Light shaking (MMI IV) / single lateral shake / 2-5 s : I live in mystic Connecticut 976 Noank ledger rbank ledgered broad. I have consistently for the last month have been logging the same Sonic Boom! The entire house shakes glasses dishes. No large trucks!! It's pretty scary. I've been here for 25 years and   
Maynard / not felt : Heard very loud boom that made me look up, heart pounding. I couldn’t imagine what could have caused the noise. Waited, but there was no further incident.  
Acton MA / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Sounded like thunder almost as if coming from above. Felt house shake/vibrate or about 1-3 seconds, as if a large truck drive by a rattled the house.  
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