Scientists Find a Razor-Sharp Line of Earthquakes Hidden Beneath Alaska

Key Points:

• A team of seismologists used machine learning to identify the precise edge of the subducting Yakutat microplate beneath central Alaska, revealing a 250-kilometer-long linear cluster of previously undetected earthquakes along this boundary.
• The study found that the Yakutat slab extends further beneath the North American plate than previously known, reaching below the Denali fault, which played a key role in the 2002 Denali earthquake, the strongest recorded in the Alaskan interior.
• The interaction of the Yakutat microplate, the Pacific plate, and the North American plate creates significant mechanical stress influencing earthquake and volcanic activity patterns in south-central Alaska.
• Researchers propose that the Yakutat slab's position beneath the Denali fault influenced the nucleation of the 2002 magnitude 7.9 earthquake and may have contributed to the formation of relatively young volcanic fields in the region.
• The findings, published in The Seismic Record, highlight how advanced data analysis techniques like machine learning can uncover hidden seismic features and improve understanding of complex tectonic interactions.