Earthquakes, man made earthquakes from things like fracking.
So, these tremors will cause the magma to recharge and build up and up and up until the volcano erupts.
Now I haven't read the OT levels, I crossed the wall of fire without them so I don't know what is explained in there about volcanos or if they are connected to the end of this civilization nor do I know the reason that an image of an erupting volcano is on the cover of Dianetics, so this is a guess, maybe the man made volcanos, that magma ie lava, that's really really hot, it's 570 degrees Fahrenheit after it's left the volcano, maybe the lava that doesn't leave the volcano seeps down into the earths core and does something to this planet internally so it stops spinning faster, faster then the 60 years as I predicted/guessed on this blog post? I don't know it's just a guess.
Maybe that lava will heat up this planets crust, you know if you have multiple volcanos, this is happening to multiple volcanos all over the planet
and the magma inside is really really hot, it's 700-1500 degrees fahrenheit. Anyway maybe the earth, this planet's crust will start to heat up and make it hotter everywhere all over the planet. Which will start to do what? Make the ocean, the sea hot, melt those glaciers even faster and the hot ocean salty water would kill fish, mammals ie sea life including the plants underwater.
then after all the sea life is dead, the oceans will dry up and that's the end of the oceans all over the planet. And the volcanos will continue erupting and magma will continue to flow towards the earths core until this planet stops spinning.
Red tides are a discoloration of the water
I suspect they are caused by the erupting volcanos, their magma seeping into the earth's, this planet's crust.
If it was natural, it would happen once and not all over the planet, when the earthquakes are man made, it's happening all over the planet.
So if this continues, you'll see more volcanos erupting, our sea life dying and our oceans disappearing.