1972 – An
earthquake swarm included two destructive events that caused extensive damage. A
magnitude 4.4 event (intensity VIII (Severe)) occurred on February 4 and a
magnitude 4.9 event (intensity IX (Violent)) occurred on June 14.
Carlo Lozzi (1887).
"Storie de'Municipii: Ancona". Biblioteca istorica della antica e nuova Italia (in Italian). Vol. 1. Imola. pp. 112–116.
OCLC12117233.{{
cite book}}: CS1 maint: location missing publisher (
link) (bibliography)
Nicola Bernardini, ed. (1890).
"Provincia di Ancona". Guida della stampa periodica italiana (in Italian). Lecce: R. Tipografia editrice salentina dei fratelli Spacciante.
hdl:
2027/njp.32101074983378.