II.—On the Stafford Earthquakes of January 14–15, 1916, and on the Relations between the Twin-Earthquakes of the Midland Counties

Abstract

The strong shock of January 14, 1919, originated in a region from which earthquakes have been absent for many years, perhaps for several centuries, and its interest is therefore increased by the fact that it was a twin-earthquake, that is, one produced by a single generative eifort in two detached foci.