DeMundo 146:9 :ܗ݀ܢܘܢ ܕܝܢ ܕܠܥܠ ܢܦܨܝܢ ܠܗ݀ ܘܠܬܚܬ ܒܓܘ̈ܢܝܬܐ ܬܪ̈ܝܨܬܐ݂܂ ܓܕܝ̈ܐ ܡܫܬܡܗܝܢ‏ : those which shake it above and below at right angles are called earthquakes
See the entire entry for gḏāy, gḏāyā n.m. earthquake, eruption