地震学 dìzhènxué seismology Origin Definitions Defs Strokes Stroke Words Sentences Sents 地震 dìzhèn noun earthquake earthquake; to shake or undergo an earthquake; movement of the earth's crust caused by tectonic shifts, volcanic activity, or explosions学 學 xué nounaffix branch of learning (bound form) a subject or branch of study; often used as a suffix for -logy, -ics, or -science