The term RELATING TO EARTHQUAKES can be summarized by the word SEISMIC, which is a seven-letter word. Seismic refers to the study of earthquakes and their effects on the Earth's surface. It is the scientific study of vibrations and waves that travel through the Earth's crust, and it is used to measure the intensity of an earthquake. Seismic data is also used to predict future earthquakes and to understand the structure of the Earth's interior.