Siberia was formed as a result of a massive hotspot volcano (Siberian Traps) ~250 million years ago (mya) and so was India ~64 mya (Deccan Traps).
So, I was working on a random planet generator for hobby video game and I was working out some basic magnetohydrodynamics and stuff and I started thinking about the causes of these big eruptions . . .
And then I remember in both instances, there are major extinction events attributed to these events. In the case of India, I remember hearing a debate about the causes of dinosaur extinction being a meteor impact in the Yucatan and/or the eruption which formed India.
So I was thinking that an impact of sufficient magnitude could cause a shock wave through the mantle. Such a shock wave would traverse the mantle (in geometry such a manifold is called a 2-sphere) and re-converge on the opposite side of the planet (antipodes).
My question concerns such events. Couldn't the compression of a wave traveling through the mantle cause the magma to 'align' magnetically?
If so, could this trigger the flow of material to follow the wave form? And, because the shock wave would traverse the 2-sphere, it would be forced to converge at an antipodal point and, could this convergence possibly drive the formation of hotspots?
I ask because India is (or was) awfully close to the opposite side of the Earth as the Yucatan.
Further, I remember when studying the surface of Mars, a similar correlation between Hellas Planitia and Olympus Mons.
Is there such an associated crater with the Siberian Traps?
And is there any sort of research going on about this phenomena?