|Mount Iliwerung is part of Mount Ili Adowajo which is a “big volcano” in the area of Lomblen Island on a large catastrophic unknown when it happened. Around the southeast of this mountain has collapsed and there is depression Ili Adowajo, which is still left only in the north and west (Mount Paugora, Mount Kawanora). On the northern edge of his depression lies the points 854, 801, 685 and 689; on the western edge formed by a mountain cavity from the top of Ili Adowajo to the south.
After a large catastroph, the depression was filled by a lava dome that still remained visible in Mt Ili Monkey from 592, 565, and 579. In the next great eruption this lava dome was destroyed, except for Ili Monyet. At that time the crater of Mount Ili Adowajo with a diameter of 1 km. According to the population of this crater in 1870 still has a horizontal base with a height of lk. 300 m asl and active solfatara.In that year also in the crater of Ili Adowajo strong eruption and gradually lava climbed upward forming the dome of Mount Ili Werung now.Constructed on the southern rim of the Lerek caldera, Iliwerung forms a prominent south-facing peninsula on Lembata (formerly Lomblen) Island. Craters and lava domes have formed along the N-S and NW-SE lines on the complex volcano; during historical time vents from the summit to the submarine SE flank have been active. The Iliwerung summit lava dome was formed during an eruption in 1870. In 1948 Iligripe lava dome grew on the eastern flank at 120 m altitude. Beginning in 1973-74, when three ephemeral islands are formed, submarine eruptions began on the lower SE flank at a vent named Hobal; several other eruptions took place from this vent before the end of the century (Smithsonian). The last eruption was in 1999.
In addition, the peak of Mount Ili Penutuh (172 m), Ili Lusitobe (247 m), Ili Waloi, and Ili Grippe (69 m). According to Hartmann (1935, pp. 828), Mount Ili Adowajo is the “great volcano” in this area, in an unknown catastrophe, the sector of the mountain collapsed, and the depression of Ili Adowajo, now only part of the north. west, namely Mount Paugora and its slopes, hell a big eruption until the above peaks occur. Among the tops of the volcano still active are Ili Werung, Ili Grippe, and Ili Woloi…