Kick ’em Jenny, also: Kick-’em-Jenny or Mt. Kick-‘Em-Jenny is an active submarine volcano or seamount on the Caribbean Sea floor, located 8 km (5 mi) north of the island of Grenada and about 8 km (5 mi) west of Ronde Island in the Grenadines. Kick-’em-Jenny rises 1,300 m (4,265 ft) above the seafloor on the steep inner western slope of the Lesser Antilles ridge. The South American tectonic plate is subducting the Caribbean tectonic plate to the east of this ridge and under the Lesser Antilles island arc. The volcano was unknown before 1939, although “Kick ’em Jenny” appeared on earlier maps as either the name of a small island now called Diamond Rock (or Île Diamante) or the name of the strait between Grenada and Ronde Island (or Île de Ronde). The name itself may be a reference to the waters sometimes being extremely rough.
The first record of the volcano was in 1939, although it must have erupted many times before that date. On 23–24 July 1939 an eruption broke the sea surface, sending a cloud of steam and debris 275 m (902 ft) into the air and generating a series of tsunamis around two metres (6.6 ft) high when they reached the coastlines of northern Grenada and the southern Grenadines. A small tsunami also reached the West coast of nearby Barbados, where ‘a sea-wave’ suddenly washed over a coastal road, most likely at Paynes Bay. The volcano has erupted on at least twelve occasions between 1939 and 2001 (the last being on December 4, 2001), although none of the eruptions has been as large as the 1939 one, and most were only detected by seismographs. The larger eruptions have also been heard underwater or on land close to the volcano as a deep rumbling sound. A submersible survey in 2003 detected a crater with active fumaroles (an opening in a planet’s crust which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide) releasing cold and hot gas bubbles. Samples of fresh olivine basalt were collected. An arc-shaped collapse structure appears on the west flank and was the apparent source of a submarine debris-avalanche extending 15 km (49,000 ft) down the ridge slope to the west toward Grenada. Signs of elevated seismicity began July 11, 2015, and on July 23 a strong continuous signal was recorded by instruments observing Kick ’em Jenny, prompting authorities to raise the alert level to orange, which is the second-highest level. The following day, July 24, at 02:00 an hour-long explosion event was recorded, scientists from the University of the West Indies Seismic Research Centre observed nothing out of the ordinary at the surface above the volcano during an overflight on 25 July, and by 18:00 no activity was recorded. On 26 July the Alert Level was lowered to Yellow.
Don’t worry, we could see this on the plotter! It is marked as a circle which is prohibited to enter so we were curious why. This is what the plotter told us:
Hazard – A permanent exclusion zone, radius 0.82 miles, has been established around the Kick Em Jenny Volcano and an outer exclusion zone, radius 2.75 miles, will be declared at time of increased or dangerous volcanic activity. (ASD 2012) Caution – A submerged volcano lies about 1.75 miles W of The Sisters. A restricted area, radius 0.8 miles, has been established around this volcano which is named Kick em Jenny. The restricted area will be expanded to 2.7 miles at times of increased or dangerous volcanic activity. Volcanic activity is not visible or audible until the volcano is in full eruption. Such activity may occur with little or no warning. (USSD 2013) Current Information on the radius of the exclusion zone and the activity of the volcano can be obtained from the Grenada Government at http://www.uwiseismic.com/General.aspx?id=27
To stay safe from any ‘kicks’ keep this rule in mind:
Exclusion Zones at Kick ’em Jenny. The volcano is located at 12.18 degrees North and 61.38 degrees West. The first exclusion zone (1.5km) is always in effect. The second exclusion zone is usually enforced during an eruption (5km).
Rules of Thumb: First exclusion zone: Stay 4km west of the Sisters, or within 1km west of the Sisters. Second exclusion zone: Stay 10km west of Isle de Ronde.