seismical

/ˈsaɪzmɪkəl/
adjective
  1. Relating to or caused by an earthquake or other vibrations of the earth. (Less common variant of 'seismic'.)
    • The seismical data helped map the fault line.
    • Seismical research has advanced our understanding of plate tectonics.
    • The old bridge was not built to handle seismical forces.