RVO reported that during 3-10 April, Rabaul caldera's Tavurvur cone emitted steam and steam-and-ash plumes that rose to 0.8-2.7 km (2,600-8,900 ft) a.s.l. and drifted W, NW, N, NE, and E. Weak roaring noises occasionally accompanied the emissions. On 3 April, explosions shook buildings in Rabaul town. Based on reports from RVO and satellite imagery, the Darwin VAAC reported that ash plumes rose to an altitude of 3 km (10,000 ft) a.s.l. during 8-9 April. Incandescent material was ejected from the crater during 9-10 April.

Geological Summary. The low-lying Rabaul caldera on the tip of the Gazelle Peninsula at the NE end of New Britain forms a broad sheltered harbor utilized by what was the island's largest city prior to a major eruption in 1994. The outer flanks of the asymmetrical shield volcano are formed by thick pyroclastic-flow deposits. The 8 x 14 km caldera is widely breached on the east, where its floor is flooded by Blanche Bay and was formed about 1,400 years ago. An earlier caldera-forming eruption about 7,100 years ago is thought to have originated from Tavui caldera, offshore to the north. Three small stratovolcanoes lie outside the N and NE caldera rims. Post-caldera eruptions built basaltic-to-dacitic pyroclastic cones on the caldera floor near the NE and W caldera walls. Several of these, including Vulcan cone, which was formed during a large eruption in 1878, have produced major explosive activity during historical time. A powerful explosive eruption in 1994 occurred simultaneously from Vulcan and Tavurvur volcanoes and forced the temporary abandonment of Rabaul city.

Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)