Paul the Deacon (Paulus Diaconus), Historia Romana (1589), in Historia Miscella,
Landolfus Sagax, 1569, Perna in Latin - on Google Play
Paul the Deacon, Historia Romana (ed. 1879), H. Droysen (Monumenta Germaniae Historica,
Scriptores rerum Germanicarum in usum scholarum separatim editi, 49),
Berlin: Hahnsche Buchhandlung]. - at archive.org. This is another edition suggested by
Emmanuela Guidoboni but in this edition at archive.org, I don't find references to the earthquakes.
Pauli Diaconi Historia Romana, in: Fonti per la Storia d'Italia 51, ed. Amedeo Crivellucci, Roma 1914
- online open access at the Augustan Library - translates easier to English with Google Page translate -
but I can't find the earthquakes in this edition either.