a. pertaining to earthquakes. seismicity, n.seismal, seismatical, seismetic, a.seismism, n. seismic phenomena. seismograph, n. instrument recording earthquakes. seismology, n. study of earthquakes. seismometer, n. sort of seismograph measuring movements of ground in earthquake. seismoscope, n. instrument merely showing occurrence of earthquake. seismotectonic, a. pertaining to geological features related to earthquakes. seismotherapy, n. medical treatments by vibrations. seismotic, a. causing earthquakes.