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Moderate mag. 5.9 earthquake - 53 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Tuesday, Dec 21, 2021 at 12:42 pm (GMT -10) -

Moderate mag. 5.9 earthquake - 53 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Tuesday, Dec 21, 2021 at 12:42 pm (GMT -10) Moderate mag. 5.9 earthquake - 53 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Tuesday, Dec 21, 2021 at 12:42 pm (GMT -10)

Moderate magnitude 5.9 earthquake at 153 km depth

21 Dec 22:45 UTC: First to report: VolcanoDiscovery after 3 minutes.
21 Dec 22:47: Now using data updates from USGS
... [show all] ...
21 Dec 23:03: Magnitude recalculated from 6.0 to 5.9. Hypocenter depth recalculated from 114.3 to 152.6 km (from 71 to 95 mi). Epicenter location corrected by 7.3 km (4.6 mi) towards SE.
Update Tue, 21 Dec 2021, 22:51

Moderate yet deep earthquake of magnitude 5.7 just reported 31 miles east of Port Alsworth, Alaska, United States

5.7 quake 21 Dec 1:42 pm (GMT -9)
5.7 quake 21 Dec 1:42 pm (GMT -9)
United States was shaken near Port Alsworth, Lake and Peninsula, Alaska, by an earthquake of magnitude 5.7 only 9 minutes ago, the United States Geological Survey reported.
The quake hit at an intermediate depth of 89 miles beneath the epicenter near Port Alsworth, Lake and Peninsula, Alaska, USA, around noon on Tuesday, December 21st, 2021, at 1:42 pm local time. The strength of the earthquake may have been tempered by its relative great depth below the surface, which makes it feel weaker in absolute terms. 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 German Research Centre for Geosciences (GFZ) which listed the quake at magnitude 5.7 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 Port Alsworth (pop. 160) located 31 miles from the epicenter, Kalifornsky (pop. 7,900) 75 miles away, Homer (pop. 5,500) 76 miles away, Kenai (pop. 7,700) 78 miles away, Nikiski (pop. 4,500) 80 miles away, and Soldotna (pop. 4,500) 83 miles away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake details

Date & timeDec 21, 2021 22:42:14 UTC -
Local time at epicenterTuesday, Dec 21, 2021 at 12:42 pm (GMT -10)
StatusConfirmed
Magnitude5.9
Depth152.6 km
Epicenter latitude / longitude60.1218°N / 153.2117°W (Kenai Peninsula, Alaska, United States)
Antipode60.122°S / 26.788°E
Shaking intensityLight shaking
Felt276 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoIliamna (12 km / 7 mi)
Nearby towns and cities62 km (38 mi) E of Port Alsworth (pop: 159) | Show on map | Quakes nearby
86 km (53 mi) WNW of Anchor Point (pop: 1,930) | Show on map | Quakes nearby
107 km (66 mi) WNW of Homer (pop: 5,520) | Show on map | Quakes nearby
111 km (69 mi) WSW of Kalifornsky (pop: 7,850) | Show on map | Quakes nearby
118 km (73 mi) WSW of Kenai (pop: 7,660) | Show on map | Quakes nearby
123 km (76 mi) WSW of Nikiski (pop: 4,490) | Show on map | Quakes nearby
125 km (78 mi) WSW of Soldotna (pop: 4,540) | Show on map | Quakes nearby
218 km (135 mi) WSW of Alaska City (pop: 298,700) | Show on map | Quakes nearby
239 km (148 mi) WSW of Eagle River (pop: 24,800) | Show on map | Quakes nearby
239 km (148 mi) WSW of Eagle River (Anchorage) (pop: 24,800) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds -14.9°C (5 F), humidity: 97%, wind: 4 m/s (7 kts) from WNW
Estimated seismic energy released4.5 x 1013 joules (12.4 gigawatt hours, equivalent to 10676 tons of TNT or 0.7 atomic bombs!) | 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
5.9153 km61 Km E of Port Alsworth, AlaskaUSGS
5.9153 kmSouthern AlaskaRaspberryShake
5.9126 kmSouthern AlaskaGFZ
5.9146 kmSOUTHERN ALASKAEMSC
5.6132 kmNear AnchorageRENASS
6.0120 kmSouthern Alaska, United States [Land: United States]INGV
5.9129 kmSouthern AlaskaGeoAu

Seismograms

Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 595 km / 370 mi | Show on map | Station Info
Seismic station College Outpost, Alaska, 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 (280)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Anchorage, AK, USA (217.2 km NE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 2-5 s : Cleaning my house when everything shifted at once. Nothing fell, but dishes and lights rattled. Very short and not strong at all, but still a bit frightening. | 16 users found this interesting. (reported through our app)  
Sterling, Alaska (130.6 km ENE of epicenter) [Map] / Moderate shaking (MMI V) / vibration and rolling / 10-15 s : It started real slow and gentle, I was in a quiet home and could hear it. I started to sway back and forth than bam! It hit and the house seemed to lift up and down and house was shaking. Than it ended. | 10 users found this interesting.  
Homer (109.1 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / vibration and rolling / 15-20 s : first a shake then some rolling then a vigorous shake that made the house make creaking noises then moderate rolling that diminishes over about 15 seconds | 8 users found this interesting.  
Eagle River, AK 99577 (241.4 km NE of epicenter) [Map] / Strong shaking (MMI VI) / vibration and rolling / 30-60 s : I was up on a six foot ladder decorating our twelve foot Christmas tree! It really shook so I jumped off and had trouble walking at first to find cover. I'm very lucky that it was short so I was not knocked off the ladder! After the very strong shaking ev | 7 users found this interesting.  
Clam Gulch (100.8 km E of epicenter) [Map] / Very strong shaking (MMI VII) / horizontal (sideways) swinging / 30-60 s : Second floor of building swayed so hard TV fell down, books and videos fell out of shelves, stuff fell off fireplace mantel, ceiling fan blades swayed so hard they hit the ceiling, occupants could not stand up for at least 20 seconds - knocked us off our | 6 users found this interesting.  
Soldotna / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : I thought my husband was moving the table while we were eating then I saw lights swinging and had nausea | 6 users found this interesting. (reported through our app)  
Anchorage, AK (East Side of town) (223.3 km NE of epicenter) [Map] / Moderate shaking (MMI V) / both vertical and horizontal swinging / 15-20 s : Large first jolt followed with moderate quick jolts(vertical), that quickly lessened into low swaying (horizontal) that lingered for about 15 seconds before drifting off. Scared the dog, kid, and myself - it definitely wasn’t something someone would say | 5 users found this interesting.  
Wasilla, Alaska (263.2 km NE of epicenter) [Map] / Weak shaking (MMI III) / both vertical and horizontal swinging / 10-15 s : I was working at my desk and it felt like I was in a moving vehicle. Just kind of rumbling along, swaying side to side. I could heat the floors creaking as well. It was not big so it was kind of relaxing. | 5 users found this interesting.  
Homer alaska (111.3 km ESE of epicenter) [Map] / Strong shaking (MMI VI) : Building jumped | 5 users found this interesting. (reported through our app)  
anchorage (216.1 km NE of epicenter) [Map] / Moderate shaking (MMI V) / complex motion difficult to describe / 20-30 s : Slow quiet start waiting to see if it got bigger then headed to safety as it did get bigger. Unusual for here it took long to build. | 3 users found this interesting.  
Anchorage AK (212.3 km ENE of epicenter) [Map] / Light shaking (MMI IV) / vibration and rolling / 5-10 s : Several seconds of barely perceptible vibration, followed by marked increase of vibration and some rolling for another 2-5 sec that set glass rattling, lamps gently swinging, and taller trees lightly swaying outside. | 3 users found this interesting.  
Anchorage Alaska (221.2 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 s : Tiny initial swaying before a audible frequency accompanied by a greater in force swaying motion and drop in Pressure. | 3 users found this interesting. (reported through our app)  
Butte Alaska (276.2 km NE of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s : Sitting in a chair at home. Sudden jolt then shaking for a couple of seconds. | 4 users found this interesting.  
Soldotna, Alaska (123.5 km ENE of epicenter) [Map] / Moderate shaking (MMI V) / simple rolling (tilting sideways along one direction) / 30-60 s : In my work van, shaking. Trees also swaying | 4 users found this interesting. (reported through our app)  
Homer, AK 99603 / Light shaking (MMI IV) / single lateral shake / 10-15 s : Light shaking for 10ish seconds then a pause followed by another set of light shaking for 10ish seconds | 3 users found this interesting.  
Sitting in a chair, stayed put. / Moderate shaking (MMI V) / horizontal (sideways) swinging : Was concerned it would ramp up. It did not. Picture and fireplace cover fell over. It was noisy. I turned the tv off and waited until it stopped. There was still some slight movement. | 3 users found this interesting.  
Soldotna (130.5 km ENE of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 10-15 s : Heard something crash like a shovel or something fell over then about 10-15 seconds of chandelier swinging and shaking on 2nd floor. Plaster may have cracked but pictures not off set. Just before it happened like 3-4 seconds birds abandoned the feeder sud | 2 users found this interesting.  
Homer, Kenai Peninsula, Alaska (108.5 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / complex motion difficult to describe / 30-60 s : Big jerking motion, my computer screens were swaying, so was the hanging lamp. Slowed down then got intense and shook for a while! | 2 users found this interesting.  
Anchorage (215.6 km NE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 10-15 s : The parked car we were sitting in rocked sideways. People who were walking didn’t feel the earthquake. | 2 users found this interesting.  
Homer, alaska (118.3 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / both vertical and horizontal swinging / 20-30 s : shake pretty good started slow and then built up to make me wonder if this was going to be the big one | 2 users found this interesting.  
Eagle River (241.9 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 15-20 s : Long low rumble for first part. Kept going, so we were on alert to see if it was going to get bigger. Larger rattling at the end right before it stopped. | 2 users found this interesting. (reported through our app)  
Soldotna (117.8 km ENE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : My house started to shake for about 5 seconds then started swaying for about 12 seconds after the shaking stopped | 2 users found this interesting.  
kenai alaska (128.9 km ENE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : bouncing changed to sideways movement and bouncing, swaying trees outside, lasted about a minute or so | 2 users found this interesting.  
near Big Lake, Matanuska-Susitna, Alaska (217.8 km NE of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / several minutes : 1:43 pm Was laying in bed The bed moved side to side Was not knocked outa bed About 3 minutes , for the whole. Shaking incident | 2 users found this interesting.  
Anchorage (217.2 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : I was in my apartment on the 3rd floor and putting up dishes. It shook enough to get both me and my dogs attention and make me want to sit down | 2 users found this interesting.  
Alaska City, Anchorage (217.1 km NE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 15-20 s : Lying down in bed on the second floor of an apartment complex. Motion was obvious to my body and shook my TV. | 2 users found this interesting.  
Ninilchik / Light shaking (MMI IV) : Sudden shaking of house, rattling and creaking. | 4 users found this interesting.  
Anchor Point Beach Halibut Campground (84.3 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / complex motion difficult to describe / 15-20 s : Sitting in truck at AP beach and thought ground would collapse into Cook Inlet, very long duration | 3 users found this interesting.  
Soldotna / Moderate shaking (MMI V) / 1-2 minutes : I was eating lunch in my truck. Truck started shaking weirdly, like the engine was having serious trouble, so I shut it off, and saw the snow falling off the spruce trees beside me in large chunks. I figured out that it was an earthquake. I knew it had to | 2 users found this interesting.  
Homer / Moderate shaking (MMI V) / complex motion difficult to describe / 15-20 s : 1st jolt was mild and resonated for 2-3 seconds side to side. 5-7 more seconds of slight sway then heavy 2 second sideways jolt followed by 8-10 seconds of decreasing sway. | 2 users found this interesting. (reported through our app)  
ANCHORAGE / Moderate shaking (MMI V) / complex motion difficult to describe / 20-30 s : Started as buzzing and very fast shaking. Then a boom accompanied by tremendous movement. Fixture were swinging for a long time as well as the chair I was sitting in. It was unlike any quake I've ever felt. | 2 users found this interesting. (reported through our app)  
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Aftershocks

[More info]

Recorded aftershocks, latest first (68 quakes)

Date and timeMag
Depth
LocationDetails
Feb 15, 2022 01:01
43 weeks ago
2.2

139 km
37 Km E of Pedro Bay, AlaskaMore
Feb 14, 2022 03:04
43 weeks ago
2.7

101 km
56 mi W of Homer, Kenai Peninsula, Alaska, USAMore
Feb 14, 2022 02:53
43 weeks ago
2.3

121 km
34 Km ESE of Pedro Bay, AlaskaMore
Feb 14, 2022 02:03
43 weeks ago
2.1

136 km
35 Km E of Pedro Bay, AlaskaMore
Feb 13, 2022 05:44
43 weeks ago
2.1

195 km
26 Km E of Port Alsworth, AlaskaMore
Feb 12, 2022 03:15
43 weeks ago
2.1

102 km
56 Km WNW of Ninilchik, AlaskaMore
Feb 11, 2022 19:15
43 weeks ago
2.4

128 km
64 Km WNW of Happy Valley, AlaskaMore
Feb 11, 2022 12:13
43 weeks ago
2.7

116 km
27 mi NW of Anchor Point, Kenai Peninsula, Alaska, USAMore
Feb 10, 2022 21:25
43 weeks ago
2.5

95 km
59 Km W of Anchor Point, AlaskaMore
Feb 9, 2022 13:00
43 weeks ago
2.5

174 km
18 Km E of Pedro Bay, AlaskaMore
Feb 9, 2022 05:45
43 weeks ago
2.1

136 km
Southern AlaskaMore
Feb 8, 2022 21:47
43 weeks ago
2.3

97 km
Southern AlaskaMore
Feb 8, 2022 07:46
44 weeks ago
2.7

84 km
50 mi SW of Kalifornsky, Kenai Peninsula, Alaska, USAMore
Feb 7, 2022 10:54
44 weeks ago
2.2

160 km
47 Km ESE of Port Alsworth, AlaskaMore
Feb 7, 2022 05:09
44 weeks ago
2.0

105 km
64 Km WNW of Happy Valley, AlaskaMore
Feb 5, 2022 06:12
44 weeks ago
4.0

99 km
36 mi W of Anchor Point, Kenai Peninsula, Alaska, USAMore
Feb 5, 2022 00:57
44 weeks ago
2.5

114 km
66 Km W of Happy Valley, AlaskaMore
Feb 3, 2022 18:24
44 weeks ago
2.4

161 km
Southern AlaskaMore
Feb 2, 2022 07:18
44 weeks ago
3.1

101 km
55 mi W of Homer, Kenai Peninsula, Alaska, USAMore
Feb 1, 2022 20:24
44 weeks ago
2.1

101 km
47 Km WNW of Ninilchik, AlaskaMore
Feb 1, 2022 15:08
44 weeks ago
3.7

130 km
60 mi W of Anchor Point, Kenai Peninsula, Alaska, USAMore
Feb 1, 2022 13:34
45 weeks ago
3.1

106 km
61 mi SW of Kalifornsky, Kenai Peninsula, Alaska, USAMore
Jan 31, 2022 20:43
45 weeks ago
2.1

192 km
27 Km ESE of Port Alsworth, AlaskaMore
Jan 29, 2022 12:40
45 weeks ago
2.5

96 km
53 Km NW of Ninilchik, AlaskaMore
Jan 28, 2022 12:17
45 weeks ago
2.9

75 km
Alaska, USAMore
Jan 28, 2022 12:11
45 weeks ago
2.1

86 km
56 Km WNW of Anchor Point, AlaskaMore
Jan 27, 2022 02:57
45 weeks ago
2.1

163 km
Southern AlaskaMore
Jan 25, 2022 05:15
46 weeks ago
2.6

126 km
Alaska, USAMore
Jan 23, 2022 22:22
46 weeks ago
2.4

100 km
54 Km WNW of Anchor Point, AlaskaMore
Jan 21, 2022 22:20
46 weeks ago
3.8

115 km
Alaska, USAMore
Jan 21, 2022 05:18
46 weeks ago - felt
5.1

117 km
Alaska, USAMore
Jan 20, 2022 17:26
46 weeks ago
2.6

4.7 km
45 Km WNW of Anchor Point, AlaskaMore
Jan 19, 2022 18:35
46 weeks ago
2.4

121 km
70 Km ENE of Pedro Bay, AlaskaMore
Jan 16, 2022 18:05
47 weeks ago
2.2

122 km
55 Km ENE of Pedro Bay, AlaskaMore
Jan 16, 2022 15:24
47 weeks ago
2.1

144 km
57 Km E of Port Alsworth, AlaskaMore
Jan 16, 2022 13:29
47 weeks ago
2.0

62 km
41 Km WNW of Anchor Point, AlaskaMore
Jan 14, 2022 21:05
47 weeks ago
2.1

108 km
59 Km WNW of Ninilchik, AlaskaMore
Jan 14, 2022 17:22
47 weeks ago
2.0

100 km
24 Km NW of Pedro Bay, AlaskaMore
Jan 12, 2022 21:47
47 weeks ago
2.3

1.2 km
63 Km ENE of Pedro Bay, AlaskaMore
Jan 12, 2022 12:42
47 weeks ago
3.1

122 km
Alaska, USAMore
Jan 12, 2022 12:23
47 weeks ago
2.6

2.5 km
60 Km ENE of Pedro Bay, AlaskaMore
Jan 12, 2022 02:26
47 weeks ago
2.0

92 km
60 Km E of Pedro Bay, AlaskaMore
Jan 11, 2022 12:05
48 weeks ago
2.3

90 km
64 Km NW of Ninilchik, AlaskaMore
Jan 10, 2022 17:45
48 weeks ago
2.0

108 km
43 Km ESE of Pedro Bay, AlaskaMore
Jan 10, 2022 17:14
48 weeks ago
2.0

138 km
38 Km ENE of Pedro Bay, AlaskaMore
Jan 10, 2022 08:35
48 weeks ago
2.0

101 km
61 Km E of Pedro Bay, AlaskaMore
Jan 10, 2022 07:43
48 weeks ago
2.1

101 km
54 Km WNW of Happy Valley, AlaskaMore
Jan 9, 2022 15:49
48 weeks ago
2.2

114 km
53 Km E of Pedro Bay, AlaskaMore
Jan 8, 2022 12:44
48 weeks ago
2.3

110 km
62 Km WNW of Anchor Point, AlaskaMore
Jan 7, 2022 09:44
48 weeks ago
2.0

92 km
63 Km W of Anchor Point, AlaskaMore
Jan 7, 2022 04:57
48 weeks ago
2.0

99 km
56 Km WNW of Anchor Point, AlaskaMore
Jan 6, 2022 16:24
48 weeks ago
2.2

117 km
73 Km WNW of Happy Valley, AlaskaMore
Jan 6, 2022 13:46
48 weeks ago
2.0

99 km
55 Km WNW of Anchor Point, AlaskaMore
Jan 5, 2022 14:06
48 weeks ago
2.2

138 km
43 Km ENE of Pedro Bay, AlaskaMore
Jan 3, 2022 22:00
49 weeks ago
2.0

89 km
39 Km WNW of Ninilchik, AlaskaMore
Jan 3, 2022 08:54
49 weeks ago
2.6

86 km
52 Km WNW of Ninilchik, AlaskaMore
Jan 2, 2022 09:07
49 weeks ago
2.4

159 km
50 Km ESE of Port Alsworth, AlaskaMore
Jan 1, 2022 22:55
49 weeks ago
2.1

79 km
41 Km W of Happy Valley, AlaskaMore
Dec 31, 2021 23:47
49 weeks ago
2.7

130 km
Alaska, USAMore
Dec 31, 2021 21:45
49 weeks ago
2.2

137 km
Alaska, USAMore
Dec 31, 2021 15:39
49 weeks ago
2.1

100 km
52 Km W of Happy Valley, AlaskaMore
Dec 30, 2021 18:28
49 weeks ago
2.2

112 km
59 Km WNW of Happy Valley, AlaskaMore
Dec 30, 2021 04:47
49 weeks ago
2.2

146 km
74 Km ENE of Port Alsworth, AlaskaMore
Dec 26, 2021 19:10
50 weeks ago
2.1

88 km
39 Km WNW of Anchor Point, AlaskaMore
Dec 26, 2021 11:21
50 weeks ago
2.1

114 km
64 Km WNW of Happy Valley, AlaskaMore
Dec 25, 2021 02:36
50 weeks ago
3.0

123 km
56 mi NW of Anchor Point, Kenai Peninsula, Alaska, USAMore
Dec 24, 2021 09:24
50 weeks ago
2.4

87 km
33 Km WNW of Anchor Point, AlaskaMore
Dec 22, 2021 12:14
50 weeks ago
2.4

136 km
Southern AlaskaMore
Show all

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