According to the Darwin VAAC, CVGHM reported that on 6 October an ash plume from Lokon-Empung rose to an altitude of 3.7 km (12,000 ft) a.s.l.; the plume altitude was determined by wind data. A thermal anomaly was detected in satellite imagery. According to a news article, an eruption at 1405 on 7 October ejected incandescent tephra as high as 350 m above the crater and generated an ash plume that rose 1.5 km. The article also noted that Lokon-Empung had erupted 41 times in September and three times on 5 October.

Geological Summary. The Lokong-Empung volcanic complex, rising above the plain of Tondano in North Sulawesi, includes four peaks and an active crater. Lokon, the highest peak, has a flat craterless top. The morphologically younger Empung cone 2 km NE has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century. A ridge extending 3 km WNW from Lokon includes the Tatawiran and Tetempangan peaks. All eruptions since 1829 have originated from Tompaluan, a 150 x 250 m crater in the saddle between Lokon and Empung. These eruptions have primarily produced small-to-moderate ash plumes that sometimes damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred.

Sources: Jakarta Globe, Darwin Volcanic Ash Advisory Centre (VAAC)