M4.1 Earthquake 53 km SSE of Adak, Alaska — July 14, 2024
2024-07-14 14:21:21 UTC (2024-07-14) · approx. 2:21 AM UTC-12 local
On July 14, 2024 at 14:21 UTC, a magnitude 4.1 shallow crustal earthquake struck 53 km SSE of Adak, Alaska, at a depth of 43.9 km and coordinates 51.4381°, -176.3085°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — 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 5.0 mainshock that occurred 18 days ago 94 km SSE of Adak, Alaska. Since the mainshock, the USGS has recorded 8 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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
-176.3085°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Adak, Alaska?
The magnitude 4.1 earthquake that struck 53 km SSE of Adak, Alaska on July 14, 2024 at 14:21 UTC had a depth of 43.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.1 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.1 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 94 km SSE of Adak, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000mz7a). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, July 14, 2024). M4.1 Earthquake 53 km SSE of Adak, Alaska — July 14, 2024. Retrieved September 20, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000mz7a/