— Twice in the 1970s, epicenters in the Delaware area were the cause of rumblings felt in Maryland. A Feb. 1972 tremor in Wilmington was felt in Cecil County. And a year later, in Feb. 1973, the shaking from a minor earthquake near the border of Delaware, New Jersey and Pennsylvania was reported throughout northeastern Maryland.
— Residents in Maryland three times have reported feeling rumblings from earthquakes centered in southern Canada in the first half of the 20th century. Baltimore and Westminster were on the southernmost reach of a strong Sept., 1944 quake centered in the St. Lawrence River area. The tremor caused about $2 million damage around its epicenter. In Feb. 1925, a magnitude 7.0 quake centered near Murray Bay, Canada lightly rattled the Maryland area. In Nov. 1935, a magnitude 6.25 quake near Timiskaming, Canada, resulted in only minor damage, but was felt in various Maryland communities.