Manam volcano (Papua New Guinea) activity update: strong intermittent explosive activity, occasional pyroclastic flows
Thursday Aug 02, 2012 09:21 AM | BY: T
RVO reported that activity at Manam increased slightly during 15-31 July, except from 18 to 20 July when there were fewer ash emissions. During most of the reporting period, when visibility was clear, gray-to-sometimes-black ash plumes were observed rising 300-700 m above the crater from two vents and drifting NW.
Rumbling was often heard on the island; rumbling on 25 July was heard on the mainland 25 km SW. Bright glow visible at night was attributed to ejected incandescent tephra.
Sub-Plinian activity occurred on most nights during 21-31 July. Small lava flows descended the SW flank. Four pyroclastic flows traveled down the SE flank on 30 July at 0638, 0640, during 1200-1300, and at 1428. The first event was the largest, and generated an ash plume that rose 1.8 km above the crater and drifted NW. Emissions from Main Crater were milder and mostly characterized by white and bluish plumes, and occasional gray ash plumes.
(Smithsonian / USGS Weekly Volcanic Activity Report)
Thursday, Jun 21, 2012
RVO reported low-to-moderate activity from Manam's Southern Crater during 1-15 June. Emissions consisted of gray and sometimes black ash clouds that rose from the crater on most days. ... [more]
Wednesday, Jun 06, 2012
RVO reported mild activity from Manam's Southern Crater during the first two weeks of May. Emissions consisted of diffuse white vapor, with diffuse blue plumes observed during 5-6 and 13-14 May. Gray and gray-brown ash clouds rose from the crater on 7, 9, and 12 May. Incandescence was visible at night during 6, 8, 10-11, and 13-14 May, and incandescent tephra was occasionally ejected from the crater. ... [more]
Thursday, Aug 21, 2008
Based on analysis of satellite imagery and information from RVO, the Darwin VAAC reported that low-level ash plumes from Manam rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted NW during 16-17 August. [more]
Thursday, Sep 27, 2007
Based on observations of satellite imagery, the Darwin VAAC reported
that ash plumes from Manam rose to an altitude of 3.7 km (12,000 ft)
a.s.l. on 17 September and drifted W. [more]
Thursday, Jun 07, 2007
Based on satellite image observations and information from RVO, the Darwin VAAC reported that diffuse plumes from Manam rose to an altitude of 3 km (10,000 ft)a.s.l. on 5 June and drifted WNW.[more]