Do you believe that major earthquakes are preceded by anomalous phenomena, such as increases in electromagnetic noise and ground deformation? There are many reports of such phenomena, but it is a great challenge to distinguish between normal and anomalous phenomena. Moreover, we have few chances to observe earthquakerelated phenomena, because major earthquakes (fortunately) do not occur frequently. I am trying to define the objective differences between normal and anomalous phenomena, through precise geophysical observations, mainly around the Miyazaki Observatory near Hyuga-Nada in southwest Japan, where large earthquakes have repeatedly occurred, together with mathematical modeling of the obtained data.