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Spectrograms from hydrophones, click
to enlarge.
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Bathymetric map of the
Kick'em Jenny volcano, click to enlarge.
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Kick'Em
Jenny Volcano
On
December 5th, 2001 at ~02:00Z, the Mid-Atlantic Ridge hydrophone
array detected a large volcanic explosion that occurred during
the submarine eruption at Kick'em Jenny volcano.
Kick'em
Jenny is located in the Carribean Sea (near Grenada)
along the Lesser Antilles Island-Arc chain.
The summit caldera of the volcano is >12m deep.
The
left image shows the MAR hydrophones that recorded the explosion.
Begining at the bottom, the records are from the "central
west", "southern west", "southern east",
and "central east" hydrophones. Tick marks are every
5 minutes. The data is sampled at 110 Hz and low-passed at
50 Hz. Unlike earthquakes, these explosion signals are very
long duration (20 min) with a diffuse spectral content. The
signals have dominant frequencies at 1-5 Hz and 10 Hz, and
are likely a result of constructive interference with ship
noise. Speculatively, these dominant frequencies could also
be a result of harmonic resonance from within the Kick'em
Jenny magma chamber.
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