Earthquake Details

Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM

Central Alaska Earthquake

The USGS has reported a 4.9 magnitude earthquake has struck Central Alaska on Sep. 13 2021, 9:56:36 PM. ...at a depth of 3.9 km. There were no significant injuries or damage reported at this point, Friendly Forecast will update this report as events unfold.

Fore and Aftershocks

There has been other seismic activity around the 4.9 Central Alaska earthquake. Below you will find the fore and after shocks associated with it.

Quake Type Magnitude Location Time Date
Aftershock 2.8 8 km WNW of Harding-Birch Lakes, Alaska 6:33:21 PM Sep. 14 2021
Aftershock 3.1 8 km NW of Harding-Birch Lakes, Alaska 3:33:19 PM Sep. 17 2021

Did you feel it?

1047 others have felt the Central Alaska earthquake and have since reported it. See below for the response locations and intensities.

Community Internet Intensity Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Community Internet Intensity Map

Responses Location Shaking Distance
1 Anchorage, AK 99515 LIGHT 403 km
1 Anchorage, AK 99516 NO 404 km
1 Chignik, AK 99564 NO 1112 km
1 Chugiak, AK 99567 WEAK 356 km
1 Homer, AK 99603 WEAK 594 km
1 Skwentna, AK 99667 WEAK 411 km
67 Fairbanks, AK 99701 LIGHT 45 km
34 Eielson AFB, AK 99702 LIGHT 31 km
25 Fort Wainwright, AK 99703 LIGHT 61 km
151 North Pole, AK 99705 LIGHT 45 km
174 Fairbanks, AK 99709 LIGHT 91 km
118 Fairbanks, AK 99712 LIGHT 78 km
2 Salcha, AK 99714 MODERATE 63 km
2 Cantwell, AK 99729 LIGHT 146 km
26 Delta Junction, AK 99737 LIGHT 94 km
4 Healy, AK 99743 LIGHT 100 km
1 Denali National Park, AK 99755 WEAK 219 km
2 Nenana, AK 99760 LIGHT 113 km
1 Victoria, Victoria, British Columbia, Canada WEAK 2292 km

Did you feel the 4.9 Central Alaska earthquake? If you felt the quake you can report it here to the USGS.

Other Imagery and Data

GEO Community Internet Intensity Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
GEO Community Internet Intensity Map

Intensity vs Distance Plot for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Intensity vs Distance Plot

Responses vs Time Plot for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Responses vs Time Plot

Macroseismic Intensity Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Macroseismic Intensity Map

Peak Ground Acceleration Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Peak Ground Acceleration Map

Peak Ground Velocity Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
Peak Ground Velocity Map

0.3 Second Peak Spectral Acceleration Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
0.3 Second Peak Spectral Acceleration Map

1 Second Peak Spectral Acceleration Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
1 Second Peak Spectral Acceleration Map

3 Second Peak Spectral Acceleration Map for the Central Alaska 4.9m Earthquake, Monday Sep. 13 2021, 9:56:36 PM
3 Second Peak Spectral Acceleration Map


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