We use all the tools of geology – mapping surface rocks, looking for geochemical anomalies, using geophysics (seismic data, gravity data, magnetic data, electrical data, and more), analyzing topography, digging trenches through faults, looking at historical earthquake data, looking for tell-tale minerals, analyzing rock properties, and much more, to study fault lines.
Note that the vast majority of faults in rocks are not presently active and are not related to earthquakes. They were in the past.
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