seismal--prophetes.ai

seismal, a. rare.
  (ˈsaɪzməl)
  [f. Gr. σεισµ-ός: see seismic a. + -al¹.]
  Seismic.

1864 in Webster. 1977 A. Hallam Planet Earth 78/3 Gravimetric, seismal and geothermal investigations of several rift zones.

Oxford English Dictionary