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Volcanoes in Indonesia are a part of the Pacific Ring of Fire. The 150 entries in the list below are grouped into six geographical regions, four of which belong to the volcanoes of the Sunda Arc trench system. The remaining two groups are volcanoes of Halmahera, including its surrounding volcanic islands, and volcanoes of Sulawesi and the Sangihe Islands. The latter group is in one volcanic arc together with the Philippine volcanoes with Morethan 220 Volcano and 130 Most Active Volcano, Indonesia is Ring of Fire The disastrous Krakatau eruption of 1883 was followed by several devastating eruptions on other islands and in 1920 a Volcano Survey was established by the government, leading to much improved volcano monitoring and reporting. … The Volcanological Survey of Indonesia (VSI) now operates a network of 64 volcano observatories continuously monitoring 59 volcanoes. The great sweep of the Sunda Arc, over 3,000 kilometers from NW Sumatra to the Banda Sea, results from the subduction of Indian Ocean crust beneath the Asian Plate. This arc includes 76% of the region’s volcanoes, but those on either end are tectonically more complex. To the NNW, the basaltic volcanism of the Andaman Islands results from short spreading centers, and to the east the Banda Arc reflects Pacific Ocean crust subducted westward. North of this arc, tectonic complexity increases, with converging plate fragments forming multiple subduction zones, mainly oriented N-S, that in turn produce the Sulawesi-Sangihe volcanoes on the west and Haimahera on the east of the collision zone. Indonesia leads the world in many volcano statistics. It has the largest number of historically active volcanoes (76), its total of 1,171 dated eruptions is only narrowly exceeded by Japan’s 1,274, and these two regions have combined to produce 1/3 of the known explosive eruptions. need info for Volcano Tour In Indonesia, contact me at odesya at exploredesa.com