Light mag. 4.0 earthquake - 4.7 mi south of Big Lake, Alaska, USA, on Thursday, September 10, 2020 at 02:18 (GMT) -

Light mag. 4.0 earthquake - 4.7 mi south of Big Lake, Alaska, USA, on Thursday, September 10, 2020 at 02:18 (GMT)

Light magnitude 4.0 earthquake at 28 km depth

10 Sep 02:21 UTC: First to report: USGS after 4 minutes.
10 Sep 02:25: Magnitude recalculated from 4.1 to 4.2. Hypocenter depth recalculated from 17.0 to 18.4 km (from 10.6 to 11.4 mi). Epicenter location corrected by 3 km (1.8 mi) towards SSW.
10 Sep 02:28: Hypocenter depth recalculated from 18.4 to 19.1 km (from 11.4 to 11.9 mi). Epicenter location corrected by 1.9 km (1.2 mi) towards SSE.
10 Sep 02:32: Hypocenter depth recalculated from 19.1 to 19.2 km (from 11.9 to 11.9 mi).
10 Sep 02:37: Magnitude recalculated from 4.2 to 4.0. Hypocenter depth recalculated from 19.2 to 27.5 km (from 11.9 to 17.1 mi). Epicenter location corrected by 6.1 km (3.8 mi) towards N.
Date & time: Sep 10, 2020 02:18:00 UTC -
Magnitude: 4
Depth: 27.5 km
Epicenter latitude / longitude: 61.4538°N / 149.9464°W (Matanuska-Susitna, Alaska, United States)
Antipode: 61.454°S / 30.054°E
Nearest volcano: Spurr (124 km / 77 mi)
Nearby towns and cities:
8 km (5 mi) S of Big Lake (pop: 3,350) --> See nearby quakes!
20 km (12 mi) WSW of Knik-Fairview (pop: 14,900) --> See nearby quakes!
21 km (13 mi) SSW of Houston (pop: 2,210) --> See nearby quakes!
25 km (16 mi) NW of Eagle River (pop: 24,800) --> See nearby quakes!
25 km (16 mi) NW of Eagle River (Anchorage) (pop: 24,800) --> See nearby quakes!
26 km (16 mi) N of Alaska City (pop: 298,700) --> See nearby quakes!
30 km (19 mi) WSW of Wasilla (pop: 9,280) --> See nearby quakes!
40 km (25 mi) WSW of Gateway (pop: 5,550) --> See nearby quakes!
50 km (31 mi) SW of Fishhook (pop: 4,680) --> See nearby quakes!
932 km (579 mi) WNW of Juneau (pop: 32,800) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) More info
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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
4.028 km7 km S of Big Lake, Alaska (USA)USGS
4.334 kmSouthern Alaska (USA)EMSC

User reports for this quake (63)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Knik-Fairview, Matanuska-Susitna, Alaska (19.8 km ENE of epicenter) [Map] / Light shaking (MMI IV) / complex motion difficult to describe / 2-5 s : There was a minor bump and two seconds later there was a significantly stronger bump | One user found this interesting. (reported through our app)  
Anchorage (27.3 km SSE of epicenter) [Map] / Light shaking (MMI IV) / both vertical and horizontal swinging / 2-5 s
Nikiski,AK (112 km SW of epicenter) [Map] / not felt : Didn't feel anything here (reported through our app)  
Eagle River, Alaska (26 km SE of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s (reported through our app)
Eagle River, Anchorage, Alaska (24.6 km ESE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Peter's Creek (25.9 km SE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s (reported through our app)
Meadow Lakes (25.3 km NE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s
Alaska City, Anchorage (31.4 km SSE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Knik-Fairview, Matanuska-Susitna, Alaska (23.7 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / very short (reported through our app)
Wasilla, AK (15.8 km ENE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short
Lakes, Matanuska-Susitna, Alaska (35.3 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short
Eagle River, Anchorage, Alaska (24.2 km SE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s (reported through our app)
Midtown, Anchorage, Tudor & Boniface (32.4 km SSE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Anchorage, AK (32.4 km SSE of epicenter) [Map] / Light shaking (MMI IV) : It was very loud. Heard it coming for 4-5 seconds (reported through our app)  
wasilla (20.8 km ENE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
wasilla (30.8 km NE of epicenter) [Map] / Light shaking (MMI IV) / very short (reported through our app)
Alaska City, Anchorage (29 km SSE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : sounded like 3 or 4 frond doors being slammed shut, very hard .5-1 sec apart (reported through our app)  
Alaska City, Anchorage (31.8 km S of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Girdwood, Anchorage, Alaska (71 km SE of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s (reported through our app)
Houston, Matanuska-Susitna, Alaska (15.3 km NE of epicenter) [Map] / Very weak shaking (MMI II) : Quick hard jolt (reported through our app)  
Eagle River, Anchorage, Alaska (27.6 km ESE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Alaska City, Anchorage (26.6 km SSE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Eagle River / Light shaking (MMI IV) / 5-10 s : felt very light shaking for about 5 seconds and it became a more moderate shaking for about 2-3 seconds after | 3 users found this interesting.  
Wasilla / Weak shaking (MMI III) / 2-5 s
Anchorage / Light shaking (MMI IV)
4333 Butte Cir Anchorage, AK 99504 / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Heard jolt felt 5 sec later  
2955 S Big Lake Rd. / Strong shaking (MMI VI) / very short : was like a big thump, as if someone w=had come up and shoved you.  
Anchorage / Weak shaking (MMI III) / 5-10 s
Anchorage / Very weak shaking (MMI II)
Big Lake / not felt / very short : Felt like someone picked up cabin and dropped it back down not very hard just real quick.  
Wasilla / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
3440 Rosella Street, Anchorage / Light shaking (MMI IV) / single lateral shake / 1-2 s
Houston (United States, 21 km N of epicenter) : Nice bump, good roll... Overall a nice experience | One user found this interesting. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : I was in the bathroom and it sounded like something banged the outside of the house. I didn’t hear furniture creak or anything rattle, though the dogs barked. Very brief, but noticeable. (reported through EMSC)  
Butte (United States, 49 km E of epicenter) : Fast shake, not bad. (reported through EMSC)  
Palmer (United States, 46 km E of epicenter) : Couch barely shook. Wouldn't have noticed except I was reading. (reported through EMSC)  
Anchorage (United States of America, 26 km S of epicenter) : it rolled North to South (reported through EMSC)  
Anchorage (United States of America, 26 km S of epicenter) : maybe a 4.0? (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Was strong an short scared meq (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Thought it was a big truck rumbling by (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : It was a jolt (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Heard it then felt it. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Little quiver (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Quick abrupt shake (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : I felt a couple of soft jolts enough to frighten me (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Thought it was maybe a sonic boom. Guess not. Dog looked around then laid back down. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : Shaking from north to south. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : I took a nap didn't feel a thing (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : It was super quick jerk. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : A rumble, a small lurch, and a brief rattle. But real movement. (reported through EMSC)  
Anchorage (United States, 26 km S of epicenter) : First floor at the desk at work, scared me it was loud big jolt shook walls once! Shutter and my heart speed up, grabbed my desk wait for quiet again (reported through EMSC)  
Eagle River (United States of America, 24 km SE of epicenter) : Felt the shaking for five seconds (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Heard it coming. When we felt it, it was just a couple good shakes. Nothing too bad. (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Slow build up. Short shake. (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Quick... Like a hard wind gust (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Heard a thud then movement lasting ~7 sec. Then I felt dizzy for about 30 sec. (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Heard a big boom , thought it was the military doing training (reported through EMSC)  
Eagle River (United States, 24 km SE of epicenter) : Heard iy. Then it began to shake and build. Thought it was going to be a good sized quake - and then it stopped. (reported through EMSC)  
Knik-Fairview (United States of America, 19 km E of epicenter) : Strong jolt KGB (reported through EMSC)  
Knik-Fairview (United States of America, 19 km E of epicenter) : Felt the floor shake (reported through EMSC)  
Knik-Fairview (United States of America, 19 km E of epicenter) : Cracking sound and small shake (reported through EMSC)  
Knik-Fairview (United States of America, 19 km E of epicenter) : Dog was whimpering about 30 seconds prior, than a big jolt. (reported through EMSC)  
Knik-Fairview (United States of America, 19 km E of epicenter) : Uggg.... there went my ❤ (reported through EMSC)  
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