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By tracking swarms of tiny, unfelt earthquakes, scientists have uncovered a complex hidden seismic zone in Northern California. This area lies beneath the surface where the San Andreas fault meets the Cascadia subduction zone, creating one of North America’s most dangerous seismic regions. The faint tremors are revealing crucial details about the geological structures deep underground, helping researchers better understand the risks associated with the convergence of these two major fault systems. This discovery provides new insights into the potential hazards and mechanics of earthquakes in this critical area.
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