PVMBG reported that during 1-31 December diffuse white plumes rose as high as 80 m above Iya’s summit. During most of that period seismicity was at normal levels and characterized by both deep and shallow volcanic earthquakes. A total of 55 deep volcanic earthquakes were recorded during the month with 12 of them recorded during 30-31 December, signifying a significant increase during that period. The Alert Level was remained at 1 (on a scale of 1-4), and the public was warned to limit activity near the active crater area.

Geological Summary. Gunung Iya is the southernmost of a group of three volcanoes comprising a small peninsula south of the city of Ende on central Flores Island. The cones to the north, Rooja and Pui, appear to be slightly older and have not shown historical activity, although Pui has a youthful profile (a reported 1671 eruption of Pui was considered to have originated from Iya volcano). Iya, whose truncated southern side drops steeply to the sea, has had numerous moderate explosive eruptions during historical time.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)