The two crossword solutions for the term 'PERTAINING TO EARTHQUAKES' are SEISMIC and SEISMAL. Seismic is an adjective that refers to the study of earthquakes and their effects, such as seismic waves. Seismal is an adjective that refers to the study of the causes of earthquakes, such as the movement of tectonic plates. Both terms are related to the study of earthquakes and their effects on the Earth's surface.