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Published online by Cambridge University Press: 01 May 2009
Compared with that of the year before, the British seismic record for 1891 is somewhat meagre. It includes a slight earthquake felt in North Cornwall on March 26, several at Invergarry, Ardochy, and Loch-hourn Head in Inverness-shire; and one other, believed to be that of an earthquake, at Bournemouth on October 25. The remarkable series of earthquakes felt between November 15 and December 14, 1890, in the district round Inverness seems to have ended at the latter date; for Mr. J. Birnie, a very careful observer residing at Balnafettack, informs me that he has felt none during the past year; and his evidence is especially valuable, since the epicentra of nearly all the shocks must have been close to that village.
page 303 note 1 There is no fault marked in the Surrey Map of the district with which the earthquake can be connected.
page 303 note 2 The fact that no shock was noticed at Otterham is in favour of the position above assigned to the fault; for, if the earthquake were due to fault-slipping, the earth-waves in the rock-masses on either side of the fault would start in opposite phases of vibration and might possibly interfere to a very great extent along the line of fault. (See a paper “On the Existence of Undisturbed Spots in Earthquakeshaken Areas,” GEOL. MAG. III. Vol. III. 1886, p. 157).Google Scholar