Tidal triggering of micro-seismicity associated with caldera dynamics in the Juan de Fuca ridge

Tidal triggering of earthquakes in diverse tectonic settings has been well documented, albeit the mechanisms and implications remain elusive. Here we present solid earth ocean tide modulation micro-seismicity, associated with caldera dynamics 2015 axial seamount eruption Juan de Fuca ridge, from well-monitored micro-seismicity catalog mid-ocean ridge volcanoes to gain an insight into complex interplay between volcano-tectonic external influence periodic tidal loading. We report a significantly strong semi-diurnal periodicity pre-eruption weak post-eruption phase, which converge statistical correlation stress. propose that during stage, fault systems are critically stressed more sensitive stress perturbation by However, processes dominated masking micro-seismicity. The unusual magma chamber inflation reactivation normal faulting, explicitly lowest tide, can be explained loading, eventual feedback mechanism on ring system.