The catastrophe was terrific and instantaneous in its effect. The observatory of Dunsink registered in all eleven shocks, all of the fifth grade of Mercalli’s scale, and there is no record extant of a similar seismic disturbance in our island since the earthquake of 1534 , the year of the rebellion of Silken Thomas. The epicentre appears to have been that part of the metropolis which constitutes the Inn’s Quay ward and parish of Saint Michan covering a surface of fortyone acres, two roods and one square pole or perch. All the lordly residences in the vicinity of the palace of justice were demolished and that noble edifice itself, in which at the time of the catastrophe important legal debates were in progress, is literally a mass of ruins beneath which it is to be feared all the occupants have been buried alive. From the reports of eyewitnesses it transpires that the seismic waves were accompanied by a violent atmospheric perturbation of cyclonic character. An article of headgear since ascertained to belong to the much respected clerk of the crown and peace Mr