Geology of the Pacific Ocean Guinea, and New Zealand lie outside the andesite line. Outside of the andesite line, volcanism is explosive; the Pacific Ring of Fire is the world's foremost belt of explosive volcanism. The Ring of Fire is named after the several hundred active volcanoes that sit above the various subduction zones. In 2009, the deepest undersea eruption ever recorded occurred at the West Mata submarine volcano, a mile beneath the ocean, close to the Tonga-Kermadec Trench, within the Ring of Fire; it was filmed by the US Jason robotic submersible which descended over . The Pacific Ocean is the only ocean which
2010 eruptions of Mount Merapi suffering from serious depression and anxiety, while one man had committed suicide, reportedly due to stress. On Thursday, 18 November the Australian Government Department of Foreign Affairs issued a second update to their 11 November travel advisory bulletin acknowledging the announcement by Indonesian authorities on 15 November scaling back the 20 kilometre exclusion zone in some of the regions around Mount Merapi. The exclusion zone had been reduced to in the District (Kabupaten) of Magelang and to in the Districts of Klaten and Boyolali. The exclusion zone in the District of Sleman, towards the city of Yogyakarta, remained at .