Ah thank you for your review! Yes I do clear up who’s talking to who from chapter 3.
We get to know later in the chapters, what has caused the force through the ground.
Also about the tectonic plate theory, I believe I have mentioned the fact; I'm quoting-
"In the coming years, with the help of scientific research, it was revealed that the earthquakes were not actually earthquakes...”
Hope that clears your doubt?
Thank you again for your review^^!