Research is being conducted on the thermal regime, petrological metamorphism, and seismicity in subduction zones, with studies focusing on various regions including the Mariana arc, Cascadia subduction zone, and Ryukyu Trench. The studies examine the thermal state, slab metamorphism, and interface seismicity in these areas, with some investigating the role of slab dehydration in triggering earthquakes. The research aims to understand the complex processes involved in subduction zones, with implications for tectonic and seismic activity.