M5.1 Earthquake near Andreanof Islands, Aleutian Islands, Alaska — January 13, 2022
2022-01-13 05:47:12 UTC (2022-01-13) · approx. 5:47 PM UTC-12 local
Felt by 1 person across nearby locations. Aftershock of the M5.3 mainshock.
On January 13, 2022 at 05:47 UTC, a magnitude 5.1 shallow crustal earthquake struck near Andreanof Islands, Aleutian Islands, Alaska, at a depth of 46.5 km and coordinates 51.2863°, -179.1427°. The earthquake was reported felt by 1 personacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.0 (light).
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 km — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.3 mainshock that occurred 4 days ago 151 km WSW of Adak, Alaska. Since the mainshock, the USGS has recorded 28 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
The epicenter is located in Alaska, a region characterized by Pacific Plate subduction beneath the North American Plate, producing frequent megathrust and crustal earthquakes along the Aleutian arc. The nearest mapped fault system is the Aleutian megathrust. View all earthquakes in Alaska.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-179.1427°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.1 earthquake near Andreanof Islands, Aleutian Islands, Alaska?
The magnitude 5.1 earthquake that struck near Andreanof Islands, Aleutian Islands, Alaska on January 13, 2022 at 05:47 UTC had a depth of 46.5 km. It was felt by 1 person with maximum shaking intensity of MMI 4.0 (light). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 51.2863°, -179.1427°, which is near Andreanof Islands, Aleutian Islands, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M5.3 one earlier?
No. This magnitude 5.1 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier 151 km WSW of Adak, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has Alaska had earthquakes this big before?
The largest recorded earthquake in Alaska was the M9.2 Great Alaska earthquake of March 27, 1964. Today's magnitude 5.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000gbj9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, January 13, 2022). M5.1 Earthquake near Andreanof Islands, Aleutian Islands, Alaska — January 13, 2022. Retrieved December 30, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000gbj9/