The 1773 Guatemala earthquake struck Guatemala on July 29 at 15:45 local time. It had an estimated epicentral magnitude of 7.5 Mi. It was part of a sequence that started in May that year. There were two strong foreshocks on June 11 and the mainshock was followed by numerous aftershocks which lasted until December 1773. The series of all these earthquakes is also referred to as the Santa Marta earthquake(s) as it had started on the feast day of Saint Martha.