average rate of seafloor spreading east of juan de fuca ridge
Juan de Fuca Ridge The ridge is a medium rate spreading center, moving outwards at a rate of approximately 6 centimeters per year.[14] Tectonic activity along the ridge is monitored primarily with the U.S. Navy's Sound Surveillance System (SOSUS) array of hydrophones, allowing for real time detection of earthquakes and eruptive events.[10]