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Mag. 5.1 earthquake - 31 mi northwest of Kenai, Kenai Peninsula, Alaska, USA, on Saturday, Mar 12, 2022, at 10:59 am (Anchorage time)

A strong magnitude 5.1 earthquake hit 49 km (31 mi) away from Kenai, Alaska,  United States, in the morning of Saturday, Mar 12, 2022 at 10.59 am local time (America/Anchorage GMT -9). The quake had a moderate depth of 88 km (55 mi) and was felt widely in the area.

Mag. 5.1 earthquake - 31 mi northwest of Kenai, Kenai Peninsula, Alaska, USA, on Saturday, Mar 12, 2022, at 10:59 am (Anchorage time) Mag. 5.1 earthquake - 31 mi northwest of Kenai, Kenai Peninsula, Alaska, USA, on Saturday, Mar 12, 2022, at 10:59 am (Anchorage time)

Moderate magnitude 5.1 earthquake at 88 km depth

12 Mar 20:02 UTC: First to report: VolcanoDiscovery after 3 minutes.
12 Mar 20:04: Now using data updates from USGS
... [show all] ...
12 Mar 20:11: Magnitude recalculated from 4.8 to 5.1. Hypocenter depth recalculated from 92.7 to 88.4 km (from 58 to 55 mi). Epicenter location corrected by 4.7 km (2.9 mi) towards W.
Update Sat, 12 Mar 2022, 20:15

Significant 5.1 quake hits near Kenai, Kenai Peninsula, Alaska, USA

5.1 quake 12 Mar 10:59 am (GMT -9)
5.1 quake 12 Mar 10:59 am (GMT -9)
The United States Geological Survey reported a magnitude 5.1 quake in the United States near Kenai, Kenai Peninsula, Alaska, only 15 minutes ago. The earthquake hit in the morning on Saturday, March 12th, 2022, at 10:59 am local time at an intermediate depth of 55 miles. 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 France's Réseau National de Surveillance Sismique (RéNaSS) which listed the quake at magnitude 5.2. Other agencies reporting the same quake include the German Research Centre for Geosciences (GFZ) at magnitude 5.1, and the citizen-seismograph network of RaspberryShake at magnitude 5.1.
Generally quakes of this magnitude are recorded by more than one agency and the results can vary, with subsequent reports that come in after the first one often showing more accuracy.
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 Nikiski (pop. 4,500) located 26 miles from the epicenter, Kenai (pop. 7,700) 31 miles away, Kalifornsky (pop. 7,900) 36 miles away, Ridgeway (pop. 2,000) 36 miles away, Cohoe (pop. 1,400) 38 miles away, Soldotna (pop. 4,500) 39 miles away, and Sterling (pop. 5,600) 46 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Alaska City (pop. 298,700) located 78 miles from the epicenter.
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 & timeMar 12, 2022 19:59:48 UTC
Local time at epicenterSaturday, Mar 12, 2022, at 10:59 am (America/Anchorage GMT -9)
StatusConfirmed
Magnitude5.1
Depth88.4 km
Epicenter latitude / longitude60.7797°N / 152.0345°W Kenai Peninsula, Alaska, United States
Seismic antipode60.7797°S / 27.9655°E
Shaking intensityWeak shaking near epicenter
Felt32 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoRedoubt (51 km / 32 mi)
Weather at epicenter at time of quakeOvercast Clouds 1.6°C (35 F), humidity: 98%, wind: 2 m/s (3 kts) from N
Estimated seismic energy released2.8 x 1012 joules (783 megawatt hours, equivalent to 674 tons of TNT) | about seismic energy
Interactive map
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Nearby places

The closest larger town where the quake might have been felt is Kalifornsky, a town with 7,900 inhabitants in the United States, in 57 km (36 mi) distance southeast of the epicenter. People likely experienced weak shaking there. Several smaller towns and villages are located closer to the epicenter and might have experienced stronger shaking.
The following table shows some of the places that might have been affected (or not) by the shaking.
Distance Place Max. shaking intensity(*) Region Country
42 km (26 mi)
E of epicenter
Nikiski
(pop: 4,490)
III: Weak
Kenai Peninsula, Alaska
49 km (31 mi)
SE of epicenter
Kenai
(pop: 7,660)
III: Weak
Alaska
57 km (36 mi)
SE of epicenter
Kalifornsky
(pop: 7,850)
III: Weak
Kenai Peninsula, Alaska
62 km (39 mi)
SE of epicenter
Soldotna
(pop: 4,540)
III: Weak
Kenai Peninsula, Alaska
74 km (46 mi)
E of epicenter
Sterling
(pop: 5,620)
III: Weak
Kenai Peninsula, Alaska
125 km (78 mi)
NE of epicenter
Anchorage
(pop: 291,200)
III: Weak
Alaska
129 km (80 mi)
S of epicenter
Gomer
(pop: 5,520)
III: Weak
Kenai Peninsula, Alaska
146 km (91 mi)
NE of epicenter
Eagle River
(pop: 24,800)
III: Weak
Anchorage, Alaska
146 km (91 mi)
NE of epicenter
Eagle River
(pop: 24,800)
III: Weak
Anchorage Municipality, Alaska
154 km (96 mi)
NE of epicenter
Knik-Fairview
(pop: 14,900)
III: Weak
Matanuska-Susitna, Alaska
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake (34)

The first report about ground shaking reached us after only 5 minutes, before other agencies reported it. We received 34 reports for this quake.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
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Houston, Alaska / Light shaking (MMI IV) / horizontal (sideways) swinging / 20-30 s : At first I thought it was the dog, leaning against the bed scratching, but it wasn’t. I even heard the furniture and walls creek slightly. | One user found this interesting.  
Seward Alaska / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s : Just sitting then started shaking back and forth like someone grabbed bed sitting on and started shaking it. Was long enough to go get clothes to get dressed.  
Soldotna / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Just a little bump that made me stop and pause and then some pretty good shaking that rattled stuff in the cupboards  
Clam Gulch / Light shaking (MMI IV) / vibration and rolling / 30-60 s : Couch gently rocking east-west motion for over 30 seconds. Woke up from a light sleep Hardly noticed but it rocked long enough to go on your website and wonder  
Cook inlet, near refinery / not felt : Nothing was felt on the water. Aboard the titan | One user found this interesting.  
Peter's Creek, AK / Light shaking (MMI IV) / 10-15 s : One strong jolt then some rolling. | One user found this interesting.  
Kenai / Weak shaking (MMI III) / complex motion difficult to describe / 1-2 minutes
Anchorage Alaska / Very weak shaking (MMI II) / simple rolling (tilting sideways along one direction) / 2-5 s
Anchorage / not felt : I slept through it! Zzzzzzz (reported through our app)  
Sterling AK / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
Ridgeway, Alaska / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 s : Brief massage (reported through our app)  
Girdwood / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
Mile 14 Kalifornsky Beach / Very weak shaking (MMI II) / single lateral shake / very short : Slight move  
Anchorage / Weak shaking (MMI III) / horizontal (sideways) swinging / 15-20 s
Eagle River / Weak shaking (MMI III) / rattling, vibrating / 15-20 s (reported through our app)
Soldotna / Light shaking (MMI IV) : First it was a bump and then shaking. (reported through our app)  
Kenai / Light shaking (MMI IV) / rattling, vibrating / 20-30 s
Homer / Weak shaking (MMI III) / single vertical bump / very short (reported through our app)
Anchorage / Light shaking (MMI IV) / rattling, vibrating / 5-10 s (reported through our app)
anchorage ak / Very weak shaking (MMI II) / rattling, vibrating / 20-30 s
Anchorage / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Slow start very little movement. Some sound of stuff shaking on my desktop. (reported through our app)  
Anchorage / Light shaking (MMI IV) / complex rolling (tilting in multiple directions) / 5-10 s
Anchorage / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s (reported through our app)
Kenai ak / Weak shaking (MMI III) / 15-20 s
North kenia / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s (reported through our app)
Kenai / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s (reported through our app)
Nikiski, AK / Weak shaking (MMI III) / single vertical bump / 1-2 s : Little shake for a short time (reported through our app)  
Kenai / Light shaking (MMI IV) / single lateral shake / 1-2 s (reported through our app)
Waiting room / Light shaking (MMI IV) / single lateral shake / 5-10 s (reported through our app)
Anchorage; at Tudor and Boniface / Very weak shaking (MMI II) / single vertical bump / very short : Heard and felt short "pop". (reported through our app)  
Kasilof / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s (reported through our app)
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What is Intensity and the Mercalli Intensity Scale?


The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.
Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.
Read more about the MMI scale!

Compare Quake Data

Data for the same earthquake as reported by different agencies

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 Depth Time GMT
2022-03-12
Epicenter Agency
5.1 88 km
55 mi
19:59:48 41 Km WNW of Nikiski, Alaska USGS (United States Geological Survey)
5.1 88 km
55 mi
19:59:48 Southern Alaska
0 km (0 mi) epicenter difference with USGS
RaspberryShake (RaspberryShake)
4.8 88 km
55 mi
19:59:47 Southern Alaska
20 km (13 mi) epicenter difference with USGS
GFZ (German Research Centre for Geosciences)
5.1 10 km
6.2 mi
(*)
19:59:39 Near Anchorage
37 km (23 mi) epicenter difference with USGS
RENASS (Réseau National de Surveillance Sismique (RéNaSS))
4.8 100 km
62 mi
19:59:46 SOUTHERN ALASKA
5.3 km (3.3 mi) epicenter difference with USGS
EMSC (European-Mediterranean Seismological Centre)
Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Seismograms

Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 502 km / 312 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. Bandpass filter applied: 0.02-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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Aftershocks for this quake

No aftershocks have been recorded so far. When aftershocks are detected, we will update this section.

What are aftershocks?


Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.
[More info]

What about this quake?


Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface of approx. 13 km2 (=5 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 6 km (4 mi).
[More info]


Recorded aftershocks, latest first (0 quake)

Date and Time GMTMag
Depth
DistanceRegionDetails
Mar 12, 2022 10:59 am (Anchorage)
1 year 51 weeks ago - felt
5.1

88 km
0 km - This quake31 mi NW of Kenai, Kenai Peninsula, Alaska, USA
Main Shock (this quake)
More

Map of aftershocks

Earthquake statistics

Average number of earthquakes

Based on data from the past 10 years and our earthquake archive back to 1900, there are about 22,000 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 6 or higher: 0.1 quakes per year (or 1 quake every 10 years)
  • Mag. 5 or higher: 0.84 quakes per year (or 1 quake every 1.2 years)
  • Mag. 4 or higher: 7 quakes per year
  • Mag. 3 or higher: 37.6 quakes per year
  • Mag. 2 or higher: 546 quakes per year (or 45 quakes per month)
  • Mag. 1 or higher: 1,900 quakes per year (or 5.3 quakes per day)
The area where this quake occurred has a very high level of seismic activity. It has had at least 13 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 5 to 10 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

Map of earlier quakes in the area of this quake

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Map to embed or share

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