Just to set a few of the facts straight: There are all sorts of records out there for the Winchester Virginia area, so it is not true that all of the records were destroyed.There are land records, tax records, probate records, etc. etc. etc.Census records are only one small portion of records to look at in researching ancestors and census records prior to 1850 (and prior to 1870 if you were black and a slave) can sometimes be not of very much help in locating ancestors.
Also,the earthquake you are refering to was the New Madrid Earthquake which was centered in New Madrid Missouri and Tecumsah was at the Shawnee and Delaware Indian villages near Cape Girardeau, 50 miles north of the epicenter at New Madrid MIssouri.(Although the quake was felt as far east as VA and the Carolinas)Tecumsah and his warriers then traveled back to the area of their village in Indiana and that is where the battle of Tippecanoe happened.