| 单词 | primary wave |
| 释义 | > as lemmasprimary wave primary wave n. see sense A. 26. primary wave 26. Seismology. Esp. in primary wave. Designating an earthquake P wave. Cf. secondary adj. 3u. ΘΚΠ the world > the earth > structure of the earth > formation of features > convulsion > [adjective] > earthquake terremotive1837 seismic1858 seismical1869 earthquaking1881 seismotic1889 principal1899 macroseismic1903 primary wave1919 seismal1977 1912 Nature 5 Sept. 4/2 The usual seismographic record shows three chief groups of disturbances, due respectively to the longitudinal and transverse waves through the core..and to the superficial waves round the crust. These..are complicated and supplemented by reflections of the deep waves at the surface, and sometimes by twin earthquakes caused by the primary.] 1919 Proc. Royal Soc. Edinb. 39 161 Tables familiar to all seismologists, in which times of transit of the primary and secondary waves are expressed in terms of the arcual distances of the stations of observation from the..epicentre. 1968 R. A. Lyttleton Myst. Solar Syst. ii. 56 The velocity of the primary waves..is always essentially faster than that of the secondary waves. 1992 Pixel Mar. 20/1 Earthquakes generate various kinds of waves, including P, S and surface waves. P-waves are the initial primary sound waves. < as lemmas |
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