The last eruption of Mount Unzen happened in 1995 after a series of at least 10,000 pyroclastic flows that persisted between 1991 and 1994. The worst eruption during this period happened on June 3, 1991 and killed 43 people, including French volcanologists Katia and Maurice Krafft.
Mount Unzen, located in Kyushu, Japan, is the name for a group of stratovolcanoes that includes Kinugasa, Fugen-dake and Kusenbu. Stratovolcanoes have a composition of layers of lava, tephra, pumice and ash. Its worst volcanic eruption happened in 1792 when a lava dome collapse caused a tsunami that killed 15,000 people. As of 2014, Mount Unzen is classified as dormant.