Seasonal microfractures beneath Alaska’s Barry Arm reveal hidden instability signals
Short, high-frequency seismic signals recorded between 2020 and 2023 beneath Cascade Glacier in Alaska’s Barry Arm display a recurring seasonal cycle that may reflect freeze-thaw cracking in subsurface rock. The study, published on December 2, 2025, in Seismological Research Letters, provides new insight into processes that influence one of the most dangerous landslide hazards in the United States.











