Thousand of new volcanoes revealed beneath the waves
Pastor Dale Morgan
Thousand of new volcanoes revealed beneath the waves*
* 10:04 09 July 2007
* NewScientist.com news service
* Catherine Brahic
The true extent to which the ocean bed is dotted with volcanoes has been
revealed by researchers who have counted 201,055 underwater cones. This
is over 10 times more than have been found before.
The team estimates that in total there could be about 3 million
submarine volcanoes, 39,000 of which rise more than 1000 metres over the
sea bed.
"The distribution of underwater volcanoes tells us something about what
is happening in the centre of the Earth," says John Hillier of the
University of Cambridge in the UK. That is because they give information
about the flows of hot rock in the mantle beneath. "But the problem is
that we cannot see through the water to count them," he says.
Satellites can detect volcanoes that are more than 1500 m high because
the mass of the submerged mountains causes gravity to pull the water in
around them. This creates domes on the ocean's surface that can be
several metres high and can be detected from space.
Data overload
But there is a multitude of small volcanoes that have gone undetected.
The only way of identifying them is to manually find their outline on
sonar measurements taken from ships.
Since the late 1960s, research vessels have been criss-crossing the
oceans using sonar instruments to measure the depth of the ocean floor.
They have generated 40 million kilometres of linear profiles showing the
topography of the ocean bed between 60° North – the latitude of southern
Alaska – and 60° South – corresponding to the tip of Patagonia.
But until now, no one had been able to sift through them all. So,
Hillier and a colleague designed a computer programme that was able to
analyse the huge amount of data and identify volcano-like shapes in the
sonar lines.
The programme found 201,055 volcanoes over 100m tall. Previously,
satellite data had identified 14,164 volcanoes over 1500 m high.
Hillier then extrapolated the data to estimate how many volcanoes exist
beyond the areas the research vessels sounded out. He estimates there
are about 39,000 volcanoes that are higher than 1000 m, leaving nearly
25,000 yet to be directly discovered.
Surprising distribution
Hiller says he was surprised to find that the density of small volcanoes
dropped in the area around Iceland, as Iceland is known to be a hotspot
for volcanic activity.
Another surprise was that he found fewer volcanoes on the seabed around
Hawaii, another volcanic hotspot. He says his findings may mean that
researchers need to re-assess their understanding of how submarine
volcanoes are formed.
In 2006, a team of researchers from Japan discovered a new type of
volcano which also defied conventional theories of volcanism. The
"petit-spot" volcanoes, aged between one to eight million years old, did
not sit at tectonic plate boundaries or over volcanic hotspots (see New
type of volcano fires imaginations).
Journal reference: Geophysical Research Letters (DOI: 10.1029/2007GL029874)
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