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Weak mag. 2.1 earthquake - 2 Km W of Sinking Spring, Pennsylvania, on Friday, Nov 12, 2021 at 10:47 pm (GMT -5) -

Weak mag. 2.1 earthquake - 2 Km W of Sinking Spring, Pennsylvania, on Friday, Nov 12, 2021 at 10:47 pm (GMT -5) Weak mag. 2.1 earthquake - 2 Km W of Sinking Spring, Pennsylvania, on Friday, Nov 12, 2021 at 10:47 pm (GMT -5)

Weak magnitude 2.1 earthquake at 3 km depth

13 Nov 03:54 UTC: First to report: VolcanoDiscovery after 7 minutes.
13 Nov 04:58: Now using data updates from USGS
13 Nov 05:44: Hypocenter depth recalculated from 1.8 to 2.9 km (from 1.1 to 1.8 mi). Epicenter location corrected by 1.1 km (0.7 mi) towards NNW.

Earthquake details

Date & timeNov 13, 2021 03:47:21 UTC -
Local time at epicenterFriday, Nov 12, 2021 at 10:47 pm (GMT -5)
StatusConfirmed
Magnitude2.1
Depth2.9 km
Epicenter latitude / longitude40.3262°N / 76.0375°W (Pennsylvania, United States)
Antipode40.326°S / 103.963°E
Shaking intensityWeak shaking
Felt210 reports
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities6 km (4 mi) W of Wyomissing (pop: 10,500) | Show on map | Quakes nearby
9 km (6 mi) W of Reading (pop: 87,900) | Show on map | Quakes nearby
18 km (11 mi) SW of Blandon (pop: 7,150) | Show on map | Quakes nearby
20 km (13 mi) NE of Ephrata (pop: 13,900) | Show on map | Quakes nearby
21 km (13 mi) WNW of Birdsboro (pop: 5,160) | Show on map | Quakes nearby
32 km (20 mi) E of Lebanon (pop: 25,500) | Show on map | Quakes nearby
34 km (21 mi) WNW of Pottstown (pop: 22,700) | Show on map | Quakes nearby
39 km (24 mi) NE of Lancaster (pop: 59,300) | Show on map | Quakes nearby
45 km (28 mi) WNW of Limerick (pop: 18,100) | Show on map | Quakes nearby
181 km (112 mi) NNE of Washington (District of Columbia) (pop: 601,700) | Show on map | Quakes nearby
Estimated seismic energy released8.9 x 107 joules (24.8 kilowatt hours) | 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
2.12.9 km2 Km W of Sinking Spring, PennsylvaniaUSGS
2.13 kmPENNSYLVANIAEMSC

Seismograms

Seismic station: Greenville, DE, USA (GEDE/LD network) | Distance from quake: 67 km / 41 mi | Show on map | Station Info
Seismic station Greenville, DE, 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 (234)

At magnitude 2.1, such a quake wouldn't normally be felt by people except under very favorable conditions.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Wyomissing / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Weak shaking and a loud banging noise, similar to nearby car crash. There was no damage or other impact. | 2 users found this interesting.  
Catasauqua, Pa (60 km NE of epicenter) [Map] / Very weak shaking (MMI II) / complex motion difficult to describe : I was sitting at my kitchen table and was not sure of what I felt. It felt like small vibrations and slight rolling. I put my hand out to make sure it vibrated slight with the movement.  
Watching television (3.1 km E of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 2-5 s : Single upwards bump with a crack then then a boom to finish. Felt and sounded like it was right under my feet. Both wife and I stopped what we were doing and felt it Definitively was a crack/boom sound with single upward motion  
Joshua drive, sinking spring (3.3 km ESE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 2-5 s : Heard a loud boom than the entire house shook for approx 3 seconds. I thought there was some sort of explosion near our house. More than light shaking but only for 2-3 seconds. I got up and checked to see if something blew up in the basement.  
wyomissing hills, pa (5 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Heard the roof rattling and vibrating on the second floor. I thought a tree had fall on the roof. Loud band. Very quick. Probably 1 second.  
Whitfield, PA 19609-1231 (3.7 km ENE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : It felt like something ran in to the house, but nothing was damaged and nothing struck the house. Pretty significant light shaking that last about30 seconds. This occurred at 512 Snyder Road, Reading, PA 19509-1231 (near Wilson HS)  
Sinking Spring, Pa (1.8 km E of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 2-5 s : Woke me from a deep sleep. Very loud sounding considering the quietness of silent household. All members of household were asleep at the time.  
Shillington (5.6 km ESE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Laying in bed and the bedroom door rattled, which happens when it isn’t latched and the front door opens or closes, so we thought someone had come in the house. Didn’t find anything when we checked though.  
Lower Heidelberg township (0.7 km NNE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 2-5 s : Felt & sounded like a large explosion just outside the house. Pictures on walls & Knick knacks on shelves rattled. Lasted a few seconds.  
Reading (3.6 km ENE of epicenter) [Map] / Weak shaking (MMI III) / complex motion difficult to describe / 2-5 s : Felt like someone was smoothly swinging my bed. Lasted for a couple of seconds both times. One after the other. Reading PA  
Sinking Spring, Berks, Pennsylvania (2.4 km SE of epicenter) [Map] / not felt / single vertical bump / 1-2 s : I was in the basement and heard a loud boom, one big adjustment then brief shaking for a few seconds.  
Wernersville Pa (3 km W of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Was standing in basement, hear thunder loud 'ka-boom' that was about a second and then rumbling for about 4 seconds and felt vibrations the whole time.  
Spring twp pa (3.5 km ESE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : It sounded like an explosion happened some where near by and the house shook or vibrated for 3 seconds.  
Reading (10.4 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Sitting in a chair in my Great Room at my home. There was a rumbling noise & house shook 5-10 seconds.  
Wyomissing,PA (5.9 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Siting in bed. Heard rumbling, then house started rattling. It moved from outside left side of house to underneath house.  
Wyomissing, Berks, Pennsylvania (5.2 km NE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / very short : The house rocked forward and back. Heard a snap sound and thud.. loud enough that my son thought my wife fell  
Sinking spring pa (1.2 km ESE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / very short : One hard slam I thought something fell in my house | One user found this interesting.  
Wernesville pa. / not felt : The boom was more like a blast. You could hear it in the air. Outside walking toward house from car. The sky and the house vibrated but the ground I was walking on did not vibrate.  
East Gaul Street / Light shaking (MMI IV) / both vertical and horizontal swinging / 10-15 s : There was a loud boom that shook my chair. My ring doorbell recorded the loud boom in my backyard followed by a bright light and a plume of dense smoke  
SINKING SPRING / not felt : I heard a very loud noise that sounded like an explosion. I assumed it was an earthquake because we've had a couple of others in the area this week.  
Colony Park, Wyomissing, Pa / Light shaking (MMI IV) / 10-15 s : Sounded light grumbling sound. Didn't feel shaking or rattling. Was on 1st level. Hubby in basement didn't notice.  
Kempton / Very weak shaking (MMI II) / single lateral shake / very short : I was on the second floor of my home and was bent over and felt a forward motion. I noticed the hangers in the closet moving side to side. I tried to recreate this by jumping and moving and could not.  
Wernersville, Pennsylvania / not felt / single vertical bump / very short : As if someone or some object forcefully fell to floor next door. also could be felt as if something exploded - one loud boom.  
West Lawn, PA / Light shaking (MMI IV) / vibration and rolling / 2-5 s : I heard an extremely loud boom, then the house shook, and I could feel my bed shake, and then a rumble vibration went through the house.  
Spring township 19608 / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Heard a noise that sounded like a freight train and momentarily felt movement like I had become dizzy. Lasted only a second or 2.  
In my home in Wyomissing, PA / Light shaking (MMI IV) / complex motion difficult to describe / 2-5 s : Our house is solid, stone & slate. Like a roar or thunder, mixed with rattling windows & shaking unlike other sounds/feelings.  
Wernersville, PA / Light shaking (MMI IV) / 2-5 s : woke me up - cared my wife who was in bed reading at the time... we have 1930s construction home... so it rattled a bit...  
Robesonia, PA / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : House shook. Loud rumble. Felt it was an earthquake or explosion/implosion (I have experienced all 3 in my life).  
Drexelwood, Spring Twp, near Wyomissing / Light shaking (MMI IV) / simple rolling (tilting sideways along one direction) / 2-5 s : Deep rumbling that went off into the distance after a few seconds. Awoke me from sleep, caused rattling in thr house.  
Middletown, NY / Light shaking (MMI IV) / rattling, vibrating / very short : It was odd like a rumbling vibrating feeling followed by dogs crying and freaking out. It was different something I haven't really felt before.  
Sinking spring / Weak shaking (MMI III) / single vertical bump / 1-2 s : Woke me out of sound sleep thought something hit the house. At first I thought it was a tree that had fallen close to the house.  
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