# Cascadia subduction zone tectonic fragmentation > Live situation record from CLSTR: https://clstr.news/situations/cascadia-subduction-zone-tectonic-fragmentation > Updated: 2026-09-03T12:15:47.000Z. Sources: 8. Developments: 2. Geologists using the Cascadia Imaging Experiment (CASIE) have identified deep tectonic fracturing within the Cascadia subduction zone off the Canadian coast. Researchers discovered a 75-kilometer-long structure where the Earth’s crust is fragmenting due to mantle forces acting on recent oceanic material. Lead researcher Brandon Shuck described the process as a gradual fragmentation rather than an abrupt collapse, comparing it to a “train slowly derailing.” The research indicates that the interaction between the Juan de Fuca and Explorer plates with the North American plate creates complex internal dynamics. Further analysis suggests the Cascadia tectonic system is gradually breaking into smaller parts as the subduction zone undergoes a long-term transformation. This change is driven by the approach of an oceanic ridge to the deep-sea trench; the resulting younger, warmer, and more buoyant lithosphere alters the tectonic plate geometry. Experts note this is a geological evolution that will unfold over millions of years rather than a sudden rupture. ## Timeline ### 2026-09-03: Pacific Ocean tectonic fragmentation identified near Canada Scientists have discovered a million-year process of tectonic fragmentation occurring beneath the Pacific Ocean near Canada, where the Cascadia system is slowly breaking into smaller parts. 3 sources. https://clstr.news/cluster/pacific-ocean-tectonic-fragmentation-identified-near-canada ### 2026-08-28: Cascadia subduction zone shows deep tectonic fracturing Researchers have identified a 75-kilometer tectonic fracture deep beneath the Pacific Ocean in the Cascadia subduction zone near Canada, revealing how oceanic crust fragments over time. 4 sources. https://clstr.news/cluster/cascadia-subduction-zone-shows-deep-tectonic-fracturing --- Cite as: Cascadia subduction zone tectonic fragmentation. CLSTR, https://clstr.news/situations/cascadia-subduction-zone-tectonic-fragmentation