Jeffro - This was the reason for my original question. The term "stratigraphically" is applied in in general to determine the continuation of beds of strata which either are disconnected by distance and orientation, or uneven with regard to fault thurst as would be the case relating to earthquakes. It would seam quite proper that geology could determine the relative timming of an earthquake based on the strata depth and thrust but as to strata being measured to a specific date in historical chronology impossible. That is the funtion of archeology and not geology. Geology can determine how,why, and what happened and suggest approximent time frames (by that I mean within X million years) and archeology then places that information into a historical context using the evidence specific to the strata.
However there may be an area of geological expertise which specialize in surface down soft strata dates but if there is I am not aware of it.
BB