An aviation report stated that at 1705 on 15 August "smoke" from Raung at an altitude of 6 km was drifting W. Following this report, aviation notices were posted in Indonesia, New Zealand, and Australia for the next 24 hours. No plume was observed by Australian meteorologists on satellite imagery from 1800 on 15 August through 2050 the next day.

The last reported eruption, which occurred sometime between January and June 1993, generated an ash column 600 m above the rim and caused ashfall in the surrounding area.

Geological Summary. Raung, one of Java's most active volcanoes, is a massive stratovolcano in easternmost Java that was constructed SW of the rim of Ijen caldera. The unvegetated summit is truncated by a dramatic steep-walled, 2-km-wide caldera that has been the site of frequent historical eruptions. A prehistoric collapse of Gunung Gadung on the W flank produced a large debris avalanche that traveled 79 km, reaching nearly to the Indian Ocean. Raung contains several centers constructed along a NE-SW line, with Gunung Suket and Gunung Gadung stratovolcanoes being located to the NE and W, respectively.

Information Contacts: BOM Darwin, Australia.