The great earthquake commemorated here took place in 740, during the reign of Leo the Isaurian, the first of the Iconoclast emperors.
Apolytikion in the Plagal of the Fourth Tone
O Thou Who lookest on the earth and makest it tremble, deliver us from the fearful menace of earthquake, O Christ our God, and by the intercessions of the Theotokos, send down upon us Thy mercies in abundance and save us.
Kontakion in the Plagal of the Second Tone
Deliver us all from earthquakes, O Lord, and from wounds unbearable on account of our sins, and spare Thy people whom Thou hast purchased with Thy Blood, O master; and deliver not Thy city to destruction by terrible earthquakes, for we know none other God besides Thee. And to those who chant do Thou respond: I am with you, and no one shall prevail against you.SOURCE:
SAINT OR FEAST POSTED THIS DATE 2008(with 2007's link here also):