M4.7 Earthquake 43 km SSW of Adak, Alaska — May 5, 2022
2022-05-05 22:58:42 UTC (2022-05-05) · approx. 10:58 AM UTC-12 local
Felt by 1 person across nearby locations.
On May 5, 2022 at 22:58 UTC, a magnitude 4.7 shallow crustal earthquake struck 43 km SSW of Adak, Alaska, at a depth of 47.1 km and coordinates 51.4976°, -176.8011°. This earthquake was detected by 103 seismic stations with good location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
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
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
-176.8011°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake near Adak, Alaska?
The magnitude 4.7 earthquake that struck 43 km SSW of Adak, Alaska on May 5, 2022 at 22:58 UTC had a depth of 47.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 51.4976°, -176.8011°, which is 43 km SSW of Adak, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
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 4.7 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000h7ec). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, May 5, 2022). M4.7 Earthquake 43 km SSW of Adak, Alaska — May 5, 2022. Retrieved July 9, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000h7ec/