Why Hawaii's volcano is so UNUSUAL

It is linked to the water currents that are driven by electric currents in the ocean called telluric currents. It is not the hypothesized borders between tectonic plates that causes the geological activity. It is in the shallow and coastal water that instabilities called double layers form along these telluric currents. These instabilities are sensitive to changes in the electric currents. Such changes can lead to explosion.
Double layers are two layers of charge. One of the layers has a net positive charge and one of them has a net negative charge. They form boundaries between most conductive media of different thermodynamic properties. There is a voltage drop across the double layers. For the double layers to maintain stability they require electric currents to circulate them.

When the current passes trough Hawaii there is a sudden change properties of the conductive media. So Hawaii should be surrounded by a double layers forming a circle around the island.
Inside the crust you can find that the current can loop around the double layers by going under it. Some of the currents will also penetrated the top of the island. When this current gets strong it will cause magma to stream up to the surface.
When these double layers explode it will result in a volcanic eruption.

Another scenario is When the double layers exist to form a border that doesn't encircle an island. But instead form a boundary along the coastal lines of continent. Then you will find that that the exploding double layers causing earth quakes.