Available Weekly Reports
| Karkar |

13 March-19 March 2013
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 26 February an ash plume from Karkar rose to an altitude of 8.5 km (28,000 ft) a.s.l. and drifted 75 km N and 130 km E.
Sources:
Darwin Volcanic Ash Advisory Centre (VAAC)
13 March 2013
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Summary of eruption dates and Volcanic Explosivity Indices (VEI).
| Start Date | Stop Date | Eruption Certainty | VEI | Evidence | Activity Area or Unit |
|---|---|---|---|---|---|
| [ 2010 Feb 25 ] | [ 2010 Feb 26 ] | Uncertain | 1 | ||
| [ 2009 May 1 ± 30 days ] | [ Unknown ] | Uncertain | |||
| [ 1980 Jan 7 ] | [ 1980 Jan 17 ] | Uncertain | 1 | ||
| 1979 Jan 12 (?) | 1979 Aug 9 | Confirmed | 2 | Historical | SE foot of Bagiai |
| 1974 Dec 30 (?) | 1975 Jun 26 | Confirmed | 2 | Historical | Bagiai |
| 1974 Feb 14 | 1974 Aug 8 | Confirmed | 2 | Historical | Bagiai |
| [ 1962 (?) ] | [ Unknown ] | Uncertain | 2 | Ulumam | |
| 1895 Jun 17 | 1895 Aug | Confirmed | 2 | Historical | |
| 1885 | Unknown | Confirmed | 2 | Historical | |
| [ 1830 ] | [ Unknown ] | Uncertain | |||
| 1643 Apr 20 | Unknown | Confirmed | 3 | Historical | |
| 1070 ± 200 years | Unknown | Confirmed | Radiocarbon (uncorrected) | South flank (Patilo Cone) | |
| 730 (?) | Unknown | Confirmed | 4 | Radiocarbon (uncorrected) | |
| 520 ± 100 years | Unknown | Confirmed | 4 | Radiocarbon (uncorrected) | |
| 870 BCE ± 75 years | Unknown | Confirmed | Radiocarbon (uncorrected) | ||
| 7140 BCE ± 150 years | Unknown | Confirmed | 4 | Radiocarbon (uncorrected) |
Karkar is a 19 x 25 km wide, forest-covered island that is truncated by two nested summit calderas. The 5.5-km-wide outer caldera was formed during one or more eruptions, the last of which occurred 9000 years ago. The eccentric 3.2-km-wide inner caldera was formed sometime between 1500 and 800 years ago. Parasitic cones are present on the northern and southern flanks of basaltic-to-andesitic Karkar volcano; a linear array of small cones extends from the northern rim of the outer caldera nearly to the coast. Most historical eruptions, which date back to 1643, have originated from Bagiai cone, a pyroclastic cone constructed within the steep-walled, 300-m-deep inner caldera. The floor of the caldera is covered by young, mostly unvegetated andesitic lava flows.