Comrie, Perthshire, England, was subject to a strange phenomenon from 1839 to 1841. Throughout the month of October 1839 in particular, a series of “shocks” were felt, some slight, some severe. The noise was described as “‘like distant thunder or reports of artillery, …sometimes high in the air, and was often heard without any sensible shock.’” The most violent quake occurred, according to the Edin. New Phil. Jour., vol. 32, on October 23. Various people in the vicinity reported that the sounds seemed to come from high in the air rather than underground. According to that same journal, 32-107, there were 247 occurrences of these sounds between Oct. 3, 1839 and Feb. 14, 1841.
–Charles Fort, New Lands, pp.404-405 (The Complete Books of Charles Fort, Dover, c1974).