microseismic, a.
(maɪkrəʊˈsaɪzmɪk)
[f. prec. + -ic.]
Pertaining to or of the nature of a faint earth tremor. (See also quot. 1972.) So also microˈseismical a., in the same sense.
| 1877 Eng. Mechanic 10 Aug. 533/3 More than 20,000 microseismic observations, made from 1870 to 1875. 1886 J. Milne Earthquakes xix. 316 The most satisfactory observations which have been made upon microseismic disturbances are those which have been made during the last ten years in Italy. Ibid., A series of microseismical observations. 1972 Gloss. Geol. (Amer. Geol. Inst.) 452/2 Microseismic data, earthquake measurement or observation by instrumental means, as opposed to macroseismic observations. The term is not to be confused with the connotation of the term microseism. 1973 Sci. Amer. Apr. 31/1 It was a great thrill when we scanned along a seismogram made at Jamestown of an explosion on Novaya Zemlya and there—Eureka!—at the travel time predicted for a wave reflected seven times was an unmistakable tiny pulse nestling in the valley of microseismic background noise. |