Abstract
IN compiling the seismic record of any country, we are liable o to errors from two sources. We cannot help omitting a large number of slight earthquakes, which it is difficult to separate from the countless tremors that are artificially produced. On the other hand, we include a smaller, but still important, number of shocks which are not seismic in their origin, though they simulate earthquakes in many ways. Errors of the former class are, of course, difficult to prevent, though they tend to become less frequent when attention is given to the subject. Those of the latter class may sometimes be eliminated by a study of the different kinds of disturbance which have been, or might be, mistaken for true earthquakes.
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References
The supposed earthquake at Chelmsford on January 7 (NATURE, vol. xli., 1890, p. 369).
NATURE, vol. xlix., 1894, pp. 324–325; The Times, January 29, 31, 1894.
The meteorite of November 20, 1887.—Hertfordshire Nat. Hist. Soc. Trans., vol. v., 1888, pp. 33–62.
Roy. Irish Acad. Trans., vol. xxi., 1848, p. 63.
"On the Breccia-Gashes of the Durham Coast and some Recent Earth-Shakes at Sunderland." (North of England Inst. of Min. Eng. Trans., vol. xxxiii., 1884, pp. 165–174.) See also Geol. Mag., vol. ii., 1885, pp. 513–515
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DAVISON, C. Spurious Earthquakes. Nature 60, 139–141 (1899). https://doi.org/10.1038/060139a0
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DOI: https://doi.org/10.1038/060139a0