A professional who studies and interprets seismic data to locate earthquakes and earthquake faults. Responsibilities include:

• Reviews, analyzes, and interprets data from seismographs and geophysical instruments.
• Establishes existence and activity of faults, and direction, motion, and stress of earth movements before, during, and after earthquakes.
• Conducts research on seismic forces affecting deformative movements of earth.
• May issue maps or reports indicating areas of seismic risk to existing or proposed construction or development.