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 the name of the strait between Grenada and Ronde Island. The name itself may be a reference to the waters sometimes being extremely rough.
Activity
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 into the air and generating a series of tsunamis around 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, although none of the eruptions have 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 releasing cold and hot gas bubbles. Samples of fresh olivinebasalt were collected. An arc shaped collapse structure appears on the west flank and was the apparent source of a submarine debris avalanche extending down the ridge slope to the west toward the Grenada Basin. The Global Volcanism Program reports the summit to be below the sea surface. 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.
The volcano is on the shipping route from St Vincent to Grenada. There is a maritime exclusion zone monitored by the Seismic Research Centre of the University of the West Indies, Trinidad, and this is normally at from the centre of the volcano. Bubbles of volcanic gases can lower water density, creating a sinking hazard. This is marked on marine charts. During periods of high levelseismic activity this is increased to.
