I would guess that the word Delicate isn&#x27;t really the case, more &quot;fine tuned&quot;. They say the volcanos are about a mile deep, so based on this calculator - <a href="http:&#x2F;&#x2F;www.calctool.org&#x2F;CALC&#x2F;other&#x2F;games&#x2F;depth_press" rel="nofollow">http:&#x2F;&#x2F;www.calctool.org&#x2F;CALC&#x2F;other&#x2F;games&#x2F;depth_press</a> , thats about 2360PSI. I am not a physicist, but it seems that if that pressure were to decrease because of a greater pull on the water from the Sun, then it would be less able to &quot;contain&quot; the magma underneath. unfortunately, I don&#x27;t know what the actual deviation in pressure down there might be with the fluctuations of the earth&#x27;s tides.<p>This also reminds me of this - <a href="http:&#x2F;&#x2F;blogs.discovermagazine.com&#x2F;d-brief&#x2F;2014&#x2F;10&#x2F;01&#x2F;antarctic-ice-melt-changing-earths-gravity&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blogs.discovermagazine.com&#x2F;d-brief&#x2F;2014&#x2F;10&#x2F;01&#x2F;antarct...</a><p>If the icecaps melt, and the water migrates into the oceans, then the pressure on the seafloor increases by some amount, which might further decrease seafloor volcanism?