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Event status: unconfirmed [?]

Reported quake or seismic-like event: 22 mi west of Nashua, Hillsborough County, New Hampshire, USA, Sunday, Oct 10, 2021 at 11:24 am (GMT -4) -

Reported quake or seismic-like event: 22 mi west of Nashua, Hillsborough County, New Hampshire, USA, Sunday, Oct 10, 2021 at 11:24 am (GMT -4) Reported quake or seismic-like event: 22 mi west of Nashua, Hillsborough County, New Hampshire, USA, Sunday, Oct 10, 2021 at 11:24 am (GMT -4)
10 Oct 15:35 UTC: First to report: VolcanoDiscovery after 11 minutes.

Earthquake details

Date & timeOct 10, 2021 15:24:21 UTC -
Local time at epicenterSunday, Oct 10, 2021 at 11:24 am (GMT -4)
Statusunconfirmed
Magnitudeunknown (3.8?)
Depth50.0 km
Epicenter latitude / longitude42.76524°N / 71.90485°W (Hillsborough, New Hampshire, United States)
Antipode42.765°S / 108.095°E
Shaking intensityVery weak shaking
Felt1032 reports
Primary data sourceVolcanoDiscovery (User-reported shaking)
Nearby towns and cities5 km (3 mi) WNW of Ipswich Canada (pop: 5,280) | Show on map | Quakes nearby
22 km (14 mi) NNW of Fitchburg (Massachusetts) (pop: 40,500) | Show on map | Quakes nearby
29 km (18 mi) NNW of Leominster (Massachusetts) (pop: 41,600) | Show on map | Quakes nearby
35 km (22 mi) WSW of Merrimack (pop: 26,700) | Show on map | Quakes nearby
36 km (22 mi) W of Nashua (pop: 88,000) | Show on map | Quakes nearby
36 km (22 mi) ESE of Keene (Cheshire County) (pop: 23,300) | Show on map | Quakes nearby
45 km (28 mi) SW of Manchester (pop: 110,200) | Show on map | Quakes nearby
50 km (31 mi) WNW of Lowell (Massachusetts) (pop: 110,700) | Show on map | Quakes nearby
58 km (36 mi) SSW of Concord (pop: 42,600) | Show on map | Quakes nearby
610 km (379 mi) NE of Washington (District of Columbia) (pop: 601,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 14.8°C (59 F), humidity: 83%, wind: 2 m/s (4 kts) from ESE
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Seismograms

Seismic station: Adam Dziewonski Observatory (Oak Ridge), Massachusetts, USA (HRV/IU network) | Distance from quake: 40 km / 25 mi | Show on map | Station Info
Seismic station Adam Dziewonski Observatory (Oak Ridge), Massachusetts, 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. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (1623)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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New Ipswich / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Heard a loud bang, like an explosion which reverberated around the woods. Slight shaking - almost like the sound waves from the noise were hitting the house. | 31 users found this interesting.  
  • Baldwinville, ma- was in our sunroom at the time and definitely heard a loud bang-almost like a Canon shot-felt nothing though! Wow!
  • Was putting on the third hole at Candia Woods and heard a loud, deep explosion off in the distance. Seemed west of Manchester. No shaking felt. Missed the putt.
Manchester / not felt : The ground did not shake. It sounded like a huge explosion from far away. You could feel it deep inside your chest. Almost like a huge bomb going off. It scared the hell out of us. This was a meteor shower weekend. Maybe one got through. Just a thought. B | 21 users found this interesting.  
  • Someone on a different thread suggested maybe a bolide. Possible given the large area that heard/felt this.
Weare, nh / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Mostly sound: a sharp and very loud cracking explosion sound followed by thunder like rumbling. The sound was very much like a cannon echoing off the hills. | 13 users found this interesting.  
  • Exactly! Here in Weare as well
  • Exactly! Here in Weare as well
Weare, nh / not felt : Was outside heard loud crack and then rumble like thunder. Lasted about 20 seconds | 14 users found this interesting.  
  • Was on my camper heard a bang than felt a shake
  • It did not last 20 seconds
Rindge nh / Light shaking (MMI IV) / single vertical bump / 1-2 s : Sounded like some one hit my house and the house shook alittle. Husband heard it outside | 13 users found this interesting.  
New Boston / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Loud bang and then 2 seconds of rumbling. Thought a tree had fallen on my house, but them shaking lasted a bit to long for just an impact. | 11 users found this interesting.  
  • Sorry to be piggybacking here. I became interested in this incident in NH from the NYT article yesterday Oct 11, 2021. I'm adding more to what I added about the mid-October 2020 incident in Minneapolis. After looking at a text msg that I sent a friend about this last year and looking at dates, the incident occurred Sunday Oct 11, 2020. According to what I relayed in the text msg, after I asked if it was thunder and said it sounded like a bomb, my husband said, that's strange that there wasn't any lightning. The tree branch that split and the top of it that fell had downed a telephone line. Consequently, the landline phone didn't work, but the base station for the wireless handsets no longer worked, that is, no longer was able to get power from the outlet and any other other outlet in the house, which makes me assume there was an electrical surge that damaged the base station ... caused by lighting? No other electrical items plugged in outlets in our house were damaged. Talking to my husband about this just no
  • Just want to share experience from mid-October last year (2020) in Minneapolis MN. Around midnight there was a thunderstorm, thunder and lighting, and then a deep loud boom. I turned to my husband and asked if that was thunder. Then I said, "That didn't sound like thunder, it sounded like a bomb." And it sounded like it came from the street at the nearest intersection in front of our house. The next day we discover a very large branch from a tree in our backyard cracked/split and the top of the branch hit the ground, luckily not our house. The entire tree did not fall and the large branch itself did not fall to the ground. So I can't imagine that the top of the branch hitting the ground would have created that loud deep sonic boom. I suppose it was a lightning strike that created that deep loud boom sound.
Phillipston, MA / Light shaking (MMI IV) / single lateral shake / 2-5 s : Felt like a boom | 12 users found this interesting.  
  • Heard a loud boom. Didn’t feel any shaking. Was outside in apple orchard.
Barnstead NH / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Loud “explosion “ sound followed immed by smaller booms | 12 users found this interesting.  
  • Barnstead Parade, shook house and windows, loud , vibrating boom.
Keene / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Not sure what it was, but heard what sounded like a big explosion - really deep boom type noise. The sound vibrated for a while and our dog started barking. My husband asked neighbors and they all heard and felt it too. My sister, in Brattleboro, Vermont | 11 users found this interesting.  
  • In Rowe Ma we also heard a loud explosion???
Baldwinville, MA / Light shaking (MMI IV) / 5-10 s : Loud explosion noise shook the house and rattled things on the walls. Dog was pacing before sound and after. | 8 users found this interesting. (reported through our app)  
  • Thank you for recognizing your doggies abilities and reporting them to us !!
New Boston, NH / Light shaking (MMI IV) / 2-5 s : Felt like someone set off a canon nearby (they do that here). Shook the walls and widows as well as the desk and chair where I was working. | 7 users found this interesting.  
03461 / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s : Sounded like a gun shot then a huge boom of thunder that shook the ground | 8 users found this interesting.  
Concord, NH at home sitting at dining table. Husba / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Light shaking. Sitting at dining table with husband. Thought perhaps a large tree had fallen. A muffled boom, then rattling. We both got up, he went out the black door and. I went out the front. We both came back inside with nothing to report. | 6 users found this interesting.  
New Boston / Moderate shaking (MMI V) / single vertical bump / very short : We experienced a single loud “boom”. Our house shook. I thought something upstairs fell, in what felt to be a vertical ceiling to floor motion. | 6 users found this interesting.  
Winchendon, MA / Light shaking (MMI IV) / 1-2 s : It sounded like a huge explosion and "Boom!" It felt like a car had hit the house. It was sudden, loud, and then nothing. Went outside to check property for accident. Nothing. Social media has lit up all over Northern Worcester County and Western Mass, an | 6 users found this interesting.  
  • Heard at Hyde Park Drive.
Bow, nh / Light shaking (MMI IV) / 1-2 s : Felt like an explosion or a sonic boom, not an earthquake | 7 users found this interesting.  
  • Wondering what the heck would of done that a Comet.?
Milford NH (21.2 km ENE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s : As if a very large tree impacted the ground. | 6 users found this interesting.  
  • I heard a loud boom like something blowing up
Deeding nh / not felt : At approximately 1130 am I heard a thundering sound in the sky . It sounded like a thunder clap that lasted approximately 15 seconds. It also sounded like a jet plane low in the sky, but it started suddenly and ended abruptly after approximately 150 secon | 5 users found this interesting.  
Weare, NH (34.7 km NNE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s : Sounded/felt almost like a cannon. One loud boom and another smaller one a few seconds later. Security cameras shook. | 4 users found this interesting.  
Mason, Hillsborough, New Hampshire (14.7 km SE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Like a shotgun, but longer and deeper, like you could feel a low frequency rumble through your body. Nothing shook, but we were at the falls and discussed that maybe ahuge boulder fell, or jokingly an earthquake. | 4 users found this interesting.  
  • Yes, heard it in Lyndborough
Athol Ma / Very weak shaking (MMI II) : We heard what sounded like thunder | 7 users found this interesting.  
winchendon, ma / Weak shaking (MMI III) / rattling, vibrating : Mainly loud boom with a little shaking. Enough to check house if something hit it | 6 users found this interesting.  
Peterborough / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Very loud explosion type noise and small shock wave | 6 users found this interesting.  
Temple, nh / Weak shaking (MMI III) / 5-10 s : Large sound like a propane tank explosion. | 6 users found this interesting.  
  • Fact: I live in temple and there was not 5-10 seconds. 1-2 seconds is the reality you failed to divulge.
Amherst / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : I was outside. I thought it was somebody setting off a large explosion that then lingered for several seconds | 4 users found this interesting.  
Chester NH (64.2 km ENE of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 2-5 s : Heard a low rumbling and then a loud sound like an explosion. We also felt mild shaking in the house for a few seconds. | 3 users found this interesting.  
Nashua NH (33.4 km E of epicenter) [Map] / not felt / 2-5 s : We heard a loud boom. Didn't feel any shaking. We hear rumblings every now and then. I would describe it like thunder in the distance or like when they use explosives when blasting ledge for construction. It's been happening for a few years every now and | 3 users found this interesting.  
Jaffrey, Cheshire, New Hampshire (11 km WNW of epicenter) [Map] / Weak shaking (MMI III) / 1-2 s : I was working in the driveway heard what sounded like a very large explosion with ground rumble as well. | 3 users found this interesting.  
Hubbardston Mass. / Very weak shaking (MMI II) / single vertical bump / very short : Was in my house heard a fast boom and doors rattled | 5 users found this interesting.  
  • Hubbardston, same report ,but more like sonic boom ,no rumble
Dunbarton nh / not felt : Loud boom but did not feel any shaking | 5 users found this interesting.  
Bow, NH / Very weak shaking (MMI II) / single vertical bump / very short : Heard loud boom and mild shake. | 5 users found this interesting.  
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