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Mag. 5.1 earthquake - 54 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Sunday, Nov 5, 2017, at 08:03 am (Anchorage time)

A strong magnitude 5.1 earthquake hit 87 km (54 mi) away from Anchor Point, Alaska,  United States, in the morning of Sunday, Nov 5, 2017 at 8.03 am local time (America/Anchorage GMT -9). The quake had a moderate depth of 138 km (86 mi) and was not felt (or at least not reported so).

Mag. 5.1 earthquake - 54 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Sunday, Nov 5, 2017, at 08:03 am (Anchorage time) Mag. 5.1 earthquake - 54 mi northwest of Anchor Point, Kenai Peninsula, Alaska, USA, on Sunday, Nov 5, 2017, at 08:03 am (Anchorage time)

Moderate magnitude 5.1 earthquake at 138 km depth

5 Nov 17:07 UTC: First to report: EMSC after 5 minutes.
Nov 5 17:08: Magnitude recalculated from 4.6 to 5.2.
Hypocenter depth recalculated from 140.0 to 136.0 km.
Nov 5 17:10: Magnitude recalculated from 5.2 to 5.3.
Hypocenter depth recalculated from 136.0 to 129.0 km.
Hypocenter depth recalculated from 129.0 to 126.0 km.
Nov 5 17:25: Magnitude recalculated from 5.3 to 4.8.
Nov 5 17:28: Magnitude recalculated from 4.8 to 5.1.
Hypocenter depth recalculated from 126.0 to 138.0 km.

Earthquake details

Date & timeNov 5, 2017 17:03:02 UTC
Local time at epicenterSunday, Nov 5, 2017, at 08:03 am (America/Anchorage GMT -9)
StatusPreliminary (automatic detection)
Depth138.0 km
Epicenter latitude / longitude60.25°N / 153.08°W Kenai Peninsula, Alaska, United States
Seismic antipode60.25°S / 26.92°E
Shaking intensityWeak shaking near epicenter
Felt0 reports
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearest volcanoRedoubt (28 km / 17 mi)
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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Ground shaking from this quake

shake map
Map of estimated ground shaking (source:USGS)

Nearby places

The closest larger town where the quake might have been felt is Anchor Point, a town with 1,900 inhabitants in the United States, in 87 km (54 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
68 km (43 mi)
W of epicenter
Port Alsworth
(pop: 159)
III: Weak
Lake and Peninsula, Alaska
87 km (54 mi)
SE of epicenter
Anchor Point
(pop: 1,930)
III: Weak
Kenai Peninsula, Alaska
99 km (61 mi)
E of epicenter
(pop: 1,360)
III: Weak
Kenai Peninsula, Alaska
106 km (66 mi)
E of epicenter
(pop: 7,660)
III: Weak
109 km (68 mi)
SE of epicenter
(pop: 5,520)
III: Weak
Kenai Peninsula, Alaska
110 km (68 mi)
NE of epicenter
(pop: 4,490)
III: Weak
Kenai Peninsula, Alaska
114 km (71 mi)
E of epicenter
(pop: 4,540)
III: Weak
Kenai Peninsula, Alaska
204 km (127 mi)
NE of epicenter
(pop: 291,200)
II: Very weak
225 km (140 mi)
NE of epicenter
Eagle River
(pop: 24,800)
II: Very weak
Anchorage, Alaska
225 km (140 mi)
NE of epicenter
Eagle River
(pop: 24,800)
II: Very weak
Anchorage Municipality, Alaska
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake (4)

There are no user reports for this quake yet.

If you felt it, be the first to report it!
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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!
Anchorage (United States, 235 km NE of epicenter) : Very slight tremor, with faintly audible rumble (reported through EMSC)  
Homer (United States, 116 km SE of epicenter) : It was a roller. (reported through EMSC)  
Wasilla (United States, 246 km NE of epicenter) : Thought someone had slammed a door. (reported through EMSC)  
Homer (United States, 135 km SE of epicenter) : It had a rolling motion..west to east. (reported through EMSC)  

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
Epicenter Agency
5.1 138 km
86 mi
17:03:02 SOUTHERN ALASKA EMSC (European-Mediterranean Seismological Centre)
5.1 138 km
86 mi
17:03:02 - 27km SW of Redoubt Volcano, Alaska
0.6 km (0.3 mi) epicenter difference with EMSC
USGS (United States Geological Survey)
5.1 115 km
71 mi
17:03:00 Southern Alaska
24 km (15 mi) epicenter difference with EMSC
GFZ (German Research Centre for Geosciences)


Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 579 km / 360 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

So far, only one aftershock has been recorded. It hit 4 weeks after the mainshock in 6.4 km (4 mi) distance. When more 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 (1 quake)

Date and Time GMTMag
Nov 30, 2017 11:17 pm (Anchorage)
6 years ago
4 weeks after main shock

129 km
6.4 km (4 mi)
SW of main shock
40 mi E of Port Alsworth, Lake and Peninsula, Alaska, USAMore
Nov 5, 2017 08:03 am (Anchorage)
6 years ago - felt

138 km
0 km - This quake54 mi NW of Anchor Point, Kenai Peninsula, Alaska, USA
Main Shock (this quake)

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 19,000 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 6 or higher: 0.08 quakes per year (or 1 quake every 12.3 years)
  • Mag. 5 or higher: 0.93 quakes per year (or 1 quake every 1.1 years)
  • Mag. 4 or higher: 10.2 quakes per year
  • Mag. 3 or higher: 50 quakes per year
  • Mag. 2 or higher: 663 quakes per year (or 55 quakes per month)
  • Mag. 1 or higher: 1,700 quakes per year (or 4.7 quakes per day)
The area where this quake occurred has a high level of seismic activity. It has had at least 10 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 10 to 15 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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