Every 14 months, silent earthquakes ever-so-slightly rattle the Cascadia subduction zone, which is capable of producing a magnitude 9.0 earthquake. Now, research shows that these so-called aseismic quakes are tied to fluid moving miles underground. These findings don't affect what we know about the risk of a dangerous quake in the Cascadia region; that information is well-known from the cycle of stress build-up and release during large earthquakes... A better understanding of the aseismic quakes could eventually help bridge the gap in understanding between this well-observed earthquake cycle and the processes happening deep within the subduction zone. The inner workings...