Library Hippolytus Refutation of All Heresies
Book 4
Chapter 39: Imitation of an Earthquake
The sensation of an earthquake they cause in such a way, as that all things seem set in motion; ordure of a weasel burned with a magnet upon coals (has this effect).
English translation by J.H. MacMahon, in Ante-Nicene Fathers, Vol. V (eds. Alexander Roberts and James Donaldson; Buffalo: Christian Literature Publishing Co., 1886). Public domain. Digital text via New Advent Church Fathers.