Seismographic is a term used in geology to describe instruments or devices that measure seismic activity or earthquakes. However, there are several synonyms that can be used to denote the same meaning. These include seismometer, earthquake recorder, seismograph, tremor detector, and ground-motion sensor. Each of these words describes a device or instrument that records or detects ground motion caused by seismic activity. They all serve the same purpose, which is to measure and monitor the movements of the earth's crust. These synonyms are widely used in scientific research and geological studies to help better understand the dynamics of earthquakes and other seismic events.