Loading seismic map...
A moderate magnitude 5.2 earthquake struck 25 km SW of Skwentna, United States on Saturday, October 13, 2007 at 03:15:20 PM UTC. This intermediate focal depth (96.1 km depth) released energy equivalent to approximately 951 tons of TNT. Here is the verified AK telemetry, live epicenter map, and ground shaking assessment.
(25 km SW of)5.2MB
Moderate Seismic Class
96.1km
Upper Mantle
61.831° N, 151.747° W
GPS Coordinates
951 tons
TNT Equivalent Power
AK
USGS Real-time Feed
A magnitude 5.2 event is classified as a moderate earthquake. Can cause slight to moderate damage to poorly constructed buildings. Felt widely across nearby communities within dozens of kilometers.
Felt by many indoors. Dishes, windows rattle; walls make creaking sound.
Help seismologists and community members map real-world ground shaking near United States.
Your immediate response verifies shaking boundaries and helps ground-truth instrumental models.
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Because seismic scales are logarithmic, each whole integer increase represents:
United States's seismicity is fundamentally governed by its tectonic setting: Pacific Plate sliding past North American Plate along San Andreas; Juan de Fuca subducting along Cascadia; Pacific subduction along the Aleutian Trench. Major regional fault structures include San Andreas Fault System, Cascadia Subduction Zone, Aleutian Megathrust, Hayward Fault, New Madrid Seismic Zone.
Originating at a depth of 96.1 km (Upper Mantle / Wadati-Benioff Zone (70–300 km)), this rupture occurred originated within the descending oceanic plate inside the upper mantle. shaking radiates over a wider geographic area with attenuated high frequencies.
Following an earthquake of magnitude 5.2, an active aftershock sequence is expected over the coming days and weeks. In accordance with Omori's Law and Båth's Law of seismology, secondary tremors decrease in frequency over time, with the largest expected aftershock historically averaging approximately 1.0 to 1.2 magnitude units below the mainshock. Local residents should remain vigilant for secondary shaking, particularly when inspecting older structures or unreinforced masonry.
Add Earthquake Today as a Preferred Source in Google to see real-time seismic alerts, epicenter maps, and aftershock telemetry highlighted in Top Stories & AI Overviews.
Monitor live earthquakes, historical magnitude leaders, and regional tectonic activity across the globe.