We tend to misunderstand the earthquake dynamic when we say that God causes great earthquakes. While it is true that God sets off earthquakes, our prayers act as a catalyst for Him to release that built-up energy safely in small magnitude earthquakes, tremblings. If we stop praying, the earthquakes will happen on their own. Recently, God unleashed these three specific earthquakes as a direct response to the rosary novena in Medjugorje. You can think of Medjugorje what you want, but they are praying.