What If the Ring of Fire Erupted Right Now?

There's a deadly 40,000 km (29,400 mi)-long zone that passes through 15 countries. This area is dotted with volcanoes, giving it the name The Ring of Fire. And we've decided that right now, all 452 volcanoes are going to erupt at the same time. Talk about an explosive event! Could this event cause subduction? Will the tectonic plates be drastically affected? Would the aftermath bring about a new supercontinent?