University of Utah Confirms Deep Earthquake in Uinta Basin, Challenging Seismic Understanding
Recent research from the University of Utah has confirmed the occurrence of a deep earthquake in the Uinta Basin, Utah, which challenges previous understandings of seismic activity. The earthquake, which struck near Maeser in September 2025, registered a magnitude of 4.1 and originated approximately 68 kilometers below the surface, well beneath the Mohorovičić discontinuity, or Moho. This boundary marks the division between Earth's crust and mantle. The event is categorized as a continental mantle earthquake, a rare type of seismic activity occurring in environments of extreme heat and pressure, where rocks typically deform slowly rather than fracturing. The study, led by geology professor Keith Koper, revisited seismic records from a similar event in 1979, confirming a pattern of deep earthquakes in the region. 
