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Report on Kick 'em Jenny (Grenada) — 21 March-27 March 2018


Kick 'em Jenny

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
21 March-27 March 2018
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2018. Report on Kick 'em Jenny (Grenada). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 March-27 March 2018. Smithsonian Institution and US Geological Survey.

Weekly Report (21 March-27 March 2018)

Kick 'em Jenny

Grenada

12.3°N, 61.64°W; summit elev. -185 m

All times are local (unless otherwise noted)


On 22 March the University of the West Indies (UWI) Seismic Research Centre (SRC) and the National Disaster Management Agency (NaDMA) reported that seismicity at Kick 'em Jenny continued to decline. The Alert Level was lowered to Yellow (the second lowest level on a four-color scale) and the maritime exclusion zone was adjusted to a radius of 1.5 km.

Geological Summary. Kick 'em Jenny, an active submarine volcano 8 km off the N shore of Grenada, rises 1,300 m from the sea floor. Recent bathymetric surveys have shown evidence for a major arcuate collapse structure, which was the source of a submarine debris avalanche that traveled more than 15 km W. Bathymetry also revealed another submarine cone to the SE, Kick 'em Jack, and submarine lava domes to its S. These and subaerial tuff rings and lava flows at Ile de Caille and other nearby islands may represent a single large volcanic complex. Numerous eruptions have occurred since 1939, mostly documented by acoustic signals. Prior to the 1939 eruption, when an eruption cloud rose 275 m above the ocean and was witnessed by a large number of people in northern Grenada, there had been no written mention of the volcano. Eruptions have involved both explosive activity and the quiet extrusion of lava flows and lava domes in the summit crater; deep rumbling noises have sometimes been heard onshore. Recent eruptions have modified the morphology of the summit crater.

Sources: University of the West Indies Seismic Research Centre (UWI-SRC), National Disaster Management Agency (NaDMA)