Also, could you please provide a link to this "Geo Cosmo Science and Research Center" that is supposed to be a part of NASA? I mean, I found https://www.geocosmo.net/ which is both obviously related to the authors and very much not a real part of NASA.
https://www.researchgate.net/publication/234022172_Explosive...
"The strong negative correlation observed between the timing of silica-rich eruptions and solar activity can be explained by variations in cosmic-ray flux arising from solar modulation. Because silica-rich magma has relatively high surface tension (similar to 0.1 Nm(-1)), the homogeneous nucleation rate is so low that such magma exists in a highly supersaturated state without considerable exsolution, even when located relatively close to the surface, within the penetration range of cosmic-ray muons (1-10 GeV)."
A bit of skepticism is healthy but these threads are getting downright dismissive.
There's a long history of research in this area to be aware, though I know the paper in question doesn't elaborate on it.
Here's one physical theory for you, straight from NASA [1].
> In the ionosphere, the solar winds generate electrical currents. On the Earth surface, these currents cause magnetic field fluctuations. These fluctuations, penetrating the Earth interior, induce the electrical currents J, and, in the presence of the Earth magnetic field B, generate electromagnetic force, known as Lorentz force F = J × B. To study the relation of earthquakes and the Lorentz force, acting at the near onset times of strong earthquakes, we examine the Kp index, a logarithmic measure of the magnetic field deviation. The time varying Kp index gives us J, which in turn determines F.
> The Lorentz force tilts the subtle force balance in the earth crust towards triggering the release of stress strain energy, initiating an earthquake in a similar way as a mountain climber’s step can trigger the avalanches. The internal dynamics, however, are highly statistical.
> We find that the distinctive patterns of the Kp surges often strongly correlate to the onset of earthquake. This correlation depends on the seismic regions and the magnitudes of earthquakes. The stronger the earthquake is, more closely the Kp surge is associated. The statistical significance of nearly 100% is obtained for the Kp variations, synchronizing with more earthquakes in the Pacific Rim region.
[1] Geomagnetic Kp Index and Earthquakes (2018) https://www.scirp.org/journal/paperinformation.aspx?paperid=...