Magnitude 6.4 - 55 miles SW of Kaktovik

August 12, 2018 06:58:53 AKDT (August 12, 2018 14:58:53 UTC)
69.5762°N 145.291°W    Depth 9.8 miles (15 km)





Tectonic Setting of the Brooks Range

Seismicity in the Brooks Range is characterized by intraplate earthquakes associated with mountain building and crustal reorganization. A broad earthquake band extends from northeast of the Brooks Range toward the Beaufort Sea. Earthquake source mechanisms comprise a mixture of strike-slip and normal faulting events, indicative of north-northwest compression and northeast extension. Together with the North Slope, this seismic zone produces a few magnitude 4-5 earthquakes per year.

Contributed by:
1Alaska Earthquake Center
2USGS National Earthquake Information Center
Learn more about magnitude types here