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Report on Heard (Australia) — 9 November-15 November 2022


Heard

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
9 November-15 November 2022
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2022. Report on Heard (Australia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 9 November-15 November 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (9 November-15 November 2022)

Heard

Australia

53.106°S, 73.513°E; summit elev. 2745 m

All times are local (unless otherwise noted)


Satellite images of Heard Island’s Big Ben volcano showed thermal anomalies of varying intensity over Mawson Peak (the summit area) and on the NW flank on 9 and 14 November. Weather clouds prevented views of the volcano for the rest of the month. The thermal anomaly on 9 November consisted of three pixels that trended NE-SW from the summit. The activity on 14 November was visible as a larger anomaly over a vent or multiple vents about less than 1 km NW of the peak.

Geological Summary. Heard Island on the Kerguelen Plateau in the southern Indian Ocean consists primarily of the emergent portion of two volcanic structures. The large glacier-covered composite basaltic-to-trachytic cone of Big Ben comprises most of the island, and the smaller Mt. Dixon lies at the NW tip of the island across a narrow isthmus. Little is known about the structure of Big Ben because of its extensive ice cover. The historically active Mawson Peak forms the island's high point and lies within a 5-6 km wide caldera breached to the SW side of Big Ben. Small satellitic scoria cones are mostly located on the northern coast. Several subglacial eruptions have been reported at this isolated volcano, but observations are infrequent and additional activity may have occurred.

Source: Sentinel Hub