We ignore still more of things about the oceans. We know that they are of considerable importance :
Weather and climate.
About life in general.
And also Economical
reach depths of about 10,000 meters.
ratio ocean/continent is about 70/30.
can therefore be assumed that the overall volcanic activity of the
ocean over the continental volcanic activity is at least in the same
thickness ratio of the crust is 30/5 = 6.
and therefore heat from the permanent volcanic activity of the ocean
is at least the same amount.
This gives a
volcanic energy released in the oceans of the order of 6 x (70/30),
42/3, so about 14 times greater than that generated on
And all this is generally invisible for us !
About the web site AVISO :
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January 2013 in the N° 57 of the magazine
is published a series of articles on Earth.
them there is one, entitled "Changement climatique et
variations récentes du niveau moyen des mers" (Climate Change and recent changes
in average sea level)
In this paper appears a map of changes in sea level over the past decade. (See opposite). The author tells us:
We translate and quote:
"... The current increase in mean sea level can be explained by three main factors whose role is now almost equal and shared.
It is the thermal expansion due to ocean warming (estimated at an average of 1.1 mm/year for the period 1993-2011).
adding water to the oceans from the melting of continental glaciers (about 1.2 mm / year for the period 2003-2009).
and the loss of ice from Greenland and Antarctica (about 1.1 mm/year for the period 2003-2009). "
The author finish with the usual climatological conclusions today.
The link below give us, in this context, a lot of information:
In front of this map we experience discomfort which does not immediately understand the cause. It's only after a few days that the evidence appears to us.
In fact this
map of sea levels reminds us some others, including those we heard, when
we were present at lessons given by Professor
Xavier Le Pichon
Collège de France.
Comparing these two cards, there is already evidence that:
Consider the most obvious between volcanic activity and ocean levels correlations:
And a few special cases:
Oceans, thermo halines currents
Therefore, in almost all cases, dilation levels that accompanies the warming of the oceans, it is always oriented from west to east?
Ocean currents would they be accountable?
Map of thermo haline ocean currents below against, shows that there is no correlation with what is observed.
Would the winds in the cause? Yes, but then it can only mean winds in ocean surface. Two observations allow us to validate this hypothesis:
§ The burning Earth:
To see and hear the animation, click on the image below.
Credit : la chaîne météo.
Volcanism and El Niño
To see the enlarged image, click below.
Carte de température de surface
Today we know a volcano whose activity is correlated with the lunar tides.
It is the Stromboli which we see the activity curve shown against. It has peaks at a rate of 14 days, which corresponds to the full and new moons (twice 14 days).
Eruzioni vulcaniche al ritmo delle fasi lunari (Italian)
Volcanic eruptions at the rate of the lunar phases (English)
New Are there other volcanoes with this kind of correlation?
Yes ! Since September 2007 there is a second one! It is Ruapehu, in northern island of New Zealand which also seems to be sensitive to the moon. See 'For Science' January 2019 No. 495. And also:
(But picture modified by us)
So we have only one terrestrial volcano showing a cyclical activity, but what about the underwater volcanic ?
We assume that the tides are active in the Earth's core.
The underwater volcanoes have a significant difference with the continental volcanoes, it is the thickness of the crust that separates the mantle. It is about 5 km for the first one and about 30 Km for the second one. So, the former are very poorly insulated of the largest and most active magmatic chamber (mantle and core)! therefore tides do not or rarely affect continental volcanoes, while the underwater volcanoes, they can be much more effective. Do not forget that in the core, the magma has a viscosity equal to that of water.
And all this happens out of sight of poor humans that we are!
What periods should we expect?
Also hope that research, as exhaustive as possible, be conducted to locate and monitor any volcanic activity of the ocean floor.
Conclusion : The sea level also depends on the underwater volcanic activity of the oceans.
Heating the ice, below Greenland.
number 480 issue of the French review "La Recherche", published in
October, 2013, learnt us that the stream of internal heat of the Earth
melt the ice, below Greenland, where the continental crust is the