2 October 1878 24:00 UT M6 upper-crustal earthquake hit Jucuapa and nearby, at THE border of Usulután and San Miguel depts., El Salvador, destroying houses and causing landslides: 30 killed. Far worse in 1951. doi.org/10.1016/S001...link.springer.com/article/10.1...nyshistoricnewspapers.org