Report on Kick 'em Jenny (Grenada) — 5 December-11 December 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 December-11 December 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Kick 'em Jenny (Grenada). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 5 December-11 December 2001. Smithsonian Institution and US Geological Survey.
Kick 'em Jenny
12.3°N, 61.64°W; summit elev. -185 m
All times are local (unless otherwise noted)
According to news reports, small earthquakes and submarine eruptions occurred at Kick-'em-Jenny beginning on about 2 December. The Seismic Research Unit of the University of the West Indies stated in the articles that "The premonitory earthquake swarms were more severe than any previously observed at Kick 'em Jenny but the size of the eruption .... has been very small so far." By 7 December the activity appeared to be calming down.
Geologic Background. Kick 'em Jenny, a historically active submarine volcano 8 km off the N shore of Grenada, rises 1300 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 historical eruptions, mostly documented by acoustic signals, have occurred since 1939, when an eruption cloud rose 275 m above the sea. Prior to the 1939 eruption, which 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. Historical eruptions have modified the morphology of the summit crater.