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IV.—On a Method of Determining the Actual Direction of Movement, whether Lateral or Vertical, in Faults
Published online by Cambridge University Press: 01 May 2009
Extract
In calculating the throw of a fault, it is usual to assume that the whole of the displacement due to the fault has been produced by a vertical motion—i.e. by a motion in a vertical plane at right angles to the direction or strike of the fault—and that there has been no such thing as a lateral movement of one face of the fault upon the other.
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- Copyright © Cambridge University Press 1897
References
page 546 note 1 The converse case of a synclinal is so similar that it is unnecessary to refer to it here.
page 546 note 2 See Quarter-sheet 78 S.E. of the Geological Survey of England and Wales. A map of the area is also given in “The Geology of North Wales” (Mem. Geol. Surv., vol. iii), 2nd ed., p. 202.Google Scholar
page 546 note 3 See, for example, “Notes on the Earthquake in Baluchistan on the 20th December, 1892,” by Griesbach, C. L.: Rec. Geol. Surv. India, vol. xxvi (1893) pp. 57–61,Google Scholar 3 plates. The chief evidence of lateral displacement is the disturbance of a railway line. This alone, however, would not be conclusive, for railways are but loosely attached to the earth. A similar disturbance of a railway line was produced in the recent Indian earthquake of the 12th June, 1897; but the figure given by Oldham, (Rec. Geol. Surv. India, vol. xxx, pl. xvii) seems to show that the sides of the railway track, as indicated by the lines of vegetation, remained undisturbed.Google Scholar
page 547 note 1 This does not mean that the point A is moved to the position A′, or B to B′; but that the line A B (which may be imagined to be indefinitely produced) is moved to the position of the line A′ B′ (also indefinitely produced).