M4.6 Earthquake 159 km SE of Chignik, Alaska — April 19, 2024
2024-04-19 07:27:33 UTC (2024-04-19) · approx. 9:27 PM UTC-10 local
On April 19, 2024 at 07:27 UTC, a magnitude 4.6 shallow crustal earthquake struck 159 km SE of Chignik, Alaska, at a depth of 21.7 km and coordinates 55.1465°, -156.8911°.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — 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
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
Earthquake Details
-156.8911°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.6 earthquake near Chignik, Alaska?
The magnitude 4.6 earthquake that struck 159 km SE of Chignik, Alaska on April 19, 2024 at 07:27 UTC had a depth of 21.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 55.1465°, -156.8911°, which is 159 km SE of Chignik, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 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 4.6 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: ak024521g2jy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, April 19, 2024). M4.6 Earthquake 159 km SE of Chignik, Alaska — April 19, 2024. Retrieved June 25, 2024 from https://www.earthquaketracker.org/earthquakes/event/ak024521g2jy/