A bigger number of around 8.85 million living in other areas of the three prefectures may have their health at risk with at least 2 cm of volcanic ash. While the direct effect of volcanic ash on the population varies on other factors such as wind direction, the Meteorological Agency may still issue a strict warning based on its observations and simulations. Meanwhile, an evacuation plan for when lava flows shows the area within the volcano divided into five parts, and dependent on the time the lava is expected to reach their towns. The current evacuation plan drawn does not include volcanic eruptions, which may happen after a major earthquake comes from the Nankai Trough in the Pacific Ocean.