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Mantle Earthquakes

All articles tagged with #mantle earthquakes

science1 month ago•8 min saved

Utah's Deep Mantle Quake Redefines Where Quakes Can Happen

University of Utah researchers reanalyzed decades of seismic data and confirmed that a 1979 Utah quake originated about 90 kilometers below the surface, revealing a rare continental mantle earthquake (CME) class. Their work, complemented by a 2025 Maeser event, shows these deep quakes occur in the mantle near the Wyoming Craton and Moho, challenging decades of assumptions about where earthquakes can originate beneath continents and informing mantle dynamics and seismic hazard assessment.

via ScienceDaily|

#continental-mantle-earthquakes #mantle-earthquakes #moho-boundary

science1 month ago•3 min saved

Utah’s Hidden Mantle Quakes Signal a New Deep‑Earth Tremor Class

Researchers have identified a new class of deep, mantle-origin earthquakes in Utah—bursts that occur far below the surface, often with little or no felt shaking—starting from the 1979 Randolph event. By linking several deep events (nine documented cases and a 2025 Utah quake), scientists suggest these quakes nucleate at great depths near the Wyoming Craton, behaving like high‑temperature, viscous molten material. While surface damage is typically low, understanding these mantle quakes is crucial for evaluating seismic hazard and limits of potential magnitudes.

via Gizmodo|

#deep-earthquakes #mantle-earthquakes #science

science5 months ago•96 min saved

Deep-Earth Quakes Detected Across Continents, Redefining Earth's Interior

A new global study maps mantle earthquakes—deep quakes originating below the Moho—and shows they occur worldwide, not just in special regions. These deep quakes can be found from the Alps to the Himalayas, East Africa, the western United States, and even the Bering Sea, suggesting mantle earthquakes are more widespread than previously thought. The researchers used a wave-analysis method to distinguish crust-origin quakes from mantle ones and focused on non-subduction regions, highlighting potential links to continental collision and rifting; most mantle quakes are too deep to be felt at the surface (depths around 35 km or more).

via Live Science|

#continental-tectonics #global-map #mantle-earthquakes