The majority of earthquake epicenters and volcanoes are both predominantly located along tectonic plate boundaries. This happens because tectonic plate movements cause seismic activity leading to earthquakes and also facilitate magma movement to the surface, causing volcanic eruptions. These locations correspond closely to areas such as the Pacific Ring of Fire, where numerous earthquakes and volcanoes occur due to the active subduction zones and plate interactions. Thus, earthquake epicenters and volcanoes have a very similar global distribution, both mainly clustered around plate boundaries rather than being randomly scattered across Earth's surface.