Indonesia is formed by the interaction of three large plates producing volcanic paths magmatic pathways and sediment deposits, as well as forming geological diversity and geological heritage that are potential to be developed into geotourism and geopark areas. Whitin a period of 800 years, Indonesia has produced three caldera with a diameter 7km (Rinjani, Tambora and Krakatau).
Hingga akhir abad 20, waktu pembentkan kaldera Rinjani masih belum diketahui. Penelitian sebelumnya oleh Kusumadinata (1969) menyinggung tentang adanya letusan besar dan kuar (paroxysmal eruption) yang menghasilkan kadera Segara Anak, tetapi kapan saat terbentuknya kadera masih belum diketahui.