M5.2 Earthquake 52 km WNW of Adak, Alaska — July 15, 2020
2020-07-15 08:59:54 UTC (2020-07-15) · approx. 8:59 PM UTC-12 local
Felt by 2 people across nearby locations.
On July 15, 2020 at 08:59 UTC, a magnitude 5.2 shallow crustal earthquake struck 52 km WNW of Adak, Alaska, at a depth of 11.8 km and coordinates 51.9791°, -177.3768°.
Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 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 2 citizen responses 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
-177.3768°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.2 earthquake near Adak, Alaska?
The magnitude 5.2 earthquake that struck 52 km WNW of Adak, Alaska on July 15, 2020 at 08:59 UTC had a depth of 11.8 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 51.9791°, -177.3768°, which is 52 km WNW of Adak, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.2 earthquakes can continue for days to weeks 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 5.2 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000antd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 15, 2020). M5.2 Earthquake 52 km WNW of Adak, Alaska — July 15, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000antd/