more alkaline basalt also was erupted, and in the very late stages after a period of erosion, rocks of unusual composition such as nephelinite were produced in very small amounts. These variations in magma composition have been investigated in great detail, in part to try to understand how mantle plumes may work. Safety Hawaiian eruptions are considered less dangerous than other types of volcanic eruptions because they produce little ash and lava flows are generally slow-moving. However, they can still cause injuries or deaths. In 1993, a photographer attempting to take pictures of a lava ocean entry died, and several tourists were injured, when a lava bench collapsed. In 2000, two people were found dead near a lava ocean entry from Kīlauea, likely killed by laze. Sulfur dioxide emissions can also be fatal, especially to people suffering from respiratory ailments. A Hawaiian eruption broke a man's leg, and in 2018, 23 people on a tour boat were injured by a steam explosion and a lava bomb at a lava ocean entry. See also Hawaiian Volcano Observatory Notes References Volcanism of Hawaii Volcanic eruption types