M4.8 Earthquake 152 km S of Hydaburg, Alaska — August 3, 2026
2026-08-03 09:17:46 UTC (58 min ago) · approx. 12:17 AM UTC-9 local
Felt by 1 person across nearby locations.
On August 3, 2026 at 09:17 UTC, a magnitude 4.8 shallow crustal earthquake struck 152 km S of Hydaburg, Alaska, at a depth of 15.0 km and coordinates 53.8370°, -132.9740°. This earthquake was detected by 12 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 355, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 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
-132.9740°E
Technical Information
Common Questions
How strong was the magnitude 4.8 earthquake near Hydaburg, Alaska?
The magnitude 4.8 earthquake that struck 152 km S of Hydaburg, Alaska on August 3, 2026 at 09:17 UTC had a depth of 15.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 53.8370°, -132.9740°, which is 152 km S of Hydaburg, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 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 4.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: attj6shm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 3, 2026). M4.8 Earthquake 152 km S of Hydaburg, Alaska — August 3, 2026. Retrieved August 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/attj6shm/