Kick 'em Jenny

Kick 'em Jenny is an active submarine volcano located in the southern Caribbean Sea, about 8 km north of Grenada and near the island of Carriacou. It forms a steep conical edifice rising from the Caribbean Plate margin and is part of an arc of volcanism associated with the Lesser Antilles Volcanic Arc. The feature has been the source of repeated eruptive unrest since its discovery in the 20th century, prompting regional hazard assessments involving multiple international agencies.

Geography and physical characteristics

Kick 'em Jenny sits on the inner slope of the Lesser Antilles island arc, positioned within the Grenadine Channel and adjacent to other arc volcanoes such as Soufrière Hills on Montserrat and La Soufrière (Saint Vincent) on Saint Vincent and the Grenadines. The summit lies approximately 150 meters below mean sea level, while the base extends to abyssal depths on the North Atlantic Ocean flank. The edifice's morphology includes a breached summit crater, radial lava and pyroclastic deposits, and flank slides comparable to deposits documented at Kick 'em Jenny's regional analogues like Kick 'em Jenny (note: local comparisons are with other submarine cones such as Kick 'em Jenny); bathymetric surveys have imaged hydrothermal vents and a ring of volcanic cones on the seafloor. The volcano occupies a position related to the subduction of the North American Plate beneath the Caribbean Plate, a tectonic setting that also includes the Puerto Rico Trench and the volcanic front stretching from Trinidad and Tobago to Saba.

Eruption history and activity

Documented eruptive activity began in the mid-20th century with episodes of gas release, ash-laden plumes, and discolored water recorded by mariners and seismic networks. Historical events have been correlated with seismic swarms detected by regional observatories such as the Seismic Research Centre (UWI) at St. Augustine, Trinidad and Tobago and the NOAA monitoring efforts. Plinian-style imagery is not applicable to shallow submarine eruptions, but explosive phreatomagmatic interactions have produced floating pumice and tephra dispersal similar to subaerial eruptions at Mount Pelée and Soufrière Saint Vincent. Major unrest episodes prompted heightened alert levels in the 1960s, 1970s, and 1990s, and modern monitoring recorded seismicity and acoustic signals consistent with magmatic intrusion and hydrothermal venting, comparable to observations at Krakatoa and Anak Krakatau.

Hazards and monitoring

Submarine eruptive hazards include explosive fragmentation, gas release, generation of transient tsunamis, and production of volcanic ash and pumice rafts that can impact shipping lanes near Grenada and Carriacou. Historical concern about tsunami generation has involved modeling efforts similar to those applied after events at Santorini and Montserrat, with regional tsunami warning and preparedness organizations such as the Caribbean Disaster Emergency Management Agency and the Intergovernmental Oceanographic Commission evaluating risk. Monitoring involves seismic arrays, hydroacoustic sensors, bathymetric mapping by institutions like the Woods Hole Oceanographic Institution and the National Oceanic and Atmospheric Administration, and ship-based observations coordinated with national authorities such as the Government of Grenada and research centers including the University of the West Indies. Maritime exclusion zones have been declared during unrest, informed by protocols used for active systems like Mount Erebus (aerial exclusion analogy) and Piton de la Fournaise (marine hazard planning).

Scientific studies and geological significance

Kick 'em Jenny has been the focus of multidisciplinary research spanning volcanology, marine geology, geophysics, and geochemistry. Studies have applied methods developed at institutions like the Scripps Institution of Oceanography and the Lamont–Doherty Earth Observatory to analyze bathymetric change, seafloor deformation, and geochemical signatures of eruptive products, including isotopic work akin to studies at Hunga Tonga–Hunga Ha'apai. Research on eruption dynamics informs understanding of submarine explosive interactions between magma and seawater, offering comparisons to palaeotsunami-generating flank collapse at La Palma and to explosive submarine activity documented at Kick 'em Jenny analogues such as Kolumbo and Marsili. Hydrothermal systems and microbial communities observed on and near the cone contribute to broader studies of extremophile ecosystems investigated at sites like Axial Seamount and the Mid-Atlantic Ridge.

Human impact and maritime restrictions

Human impacts are primarily maritime: shipping, fishing, and tourism in waters around Grenada have been affected by periodic exclusion zones and advisories issued by maritime authorities, port officials, and international shipping organizations such as the International Maritime Organization. Episodes of discolored water, floating pumice, and gas emissions have posed hazards to vessels and prompted temporary closures of fishing grounds and yachting routes frequented by visitors to Carriacou and St. George's, Grenada. Collaborative emergency planning has involved regional institutions including the Caribbean Community and national agencies like the Grenada Coast Guard. Long-term economic considerations echo those following volcanic crises at Montserrat and Saint Vincent and the Grenadines, influencing insurance, marine navigation, and disaster preparedness strategies.

Category:Submarine volcanoes Category:Volcanoes of Grenada