Indeed. Though again, I would not claim any particular level of expertise, having once shared the company of those far more capable.

[He gives a small nod to Kaiba’s guesswork, and attempts to search out his suspected culprit. Ah... there it is. He gestures towards it - a crack in the ground, containing a milky-white and shimmering substance.]

I do belive the earthquakes have played a role in this, yes. In each location where I ‘hear voices’, as you say, the one common feature I have found has been these small fissures... yet the position is static, the range is limited, and it is impossible to direct the messages to any one individual. Should someone wish to speak with others this way, they can but hope there are others in the vicinity of another fissure.