Published online by Cambridge University Press: 01 May 2009
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.
page 303 note 1 Geogr. Journ., vol. xlvi, pp. 360–1, 1915.Google Scholar
page 309 note 1 Close to Eccleshall there is a small post-Triassic fault (Geol. Surv. map, sheet 22, S.W.), which is parallel to the longer axis of the isoseismal 7, and hades to the north. If this fault were continued to the east it would occupy the position assigned to the fault-line by the seismic evidence.
page 310 note 1 Quart. Journ. Geol. Soc., vol. lx, pp. 215–32, 1904.Google Scholar
page 310 note 2 Quart. Journ. Geol. Soc., vol. lxi, pp. 8–17, 1905.Google Scholar
page 311 note 1 Geol. Mag., Vol. V, pp. 301–3, 1908.Google Scholar
page 311 note 2 Quart. Journ. Geol. Soc., vol. lxi, pp. 1–7, 1905.Google Scholar
page 311 note 3 It will be noticed that the distance between the foci of the Leicester earthquake is about double that between the foci of the Derby and Stafford earthquakes. Possibly, the foci of the Leicester earthquake occupy the crests of successive folds; but there are difficulties in the way of such an explanation.