5 Sakurajima, Japan (41)
Much like Kilauea, Japan's Sakurajima is a constant in the Pliny's. Sakurajima kept producing its multitude of small explosive eruptions, many of which are caught on the webcams that are pointed at the volcano. Some of this year's explosions reached even higher than normal, upwards of 6 km / 20,000 feet.
Image: Video capture of Sakurajima on April 10, 2012. Photovolcanica.