单词 | epifocal |
释义 | epifocaladj. Geology. Situated above the focus of an earthquake. ΘΚΠ the world > the earth > structure of the earth > formation of features > convulsion > [adjective] > earthquake > epicentre or epifocus epicentral1887 epifocal1898 1898 J. Milne Seismol. x. 195 Mallet's well known method..might..outside an epifocal area, be equally well used for the..determination of the maximum slopes of surface waves. 1902 Encycl. Brit. XXVII. 608/1 Causes which should produce magnetic effects within an epifocal district. 1910 Encycl. Brit. VIII. 817/2 [article Earthquake] That part of the surface of the earth which is vertically above the centre is called the epicentre; or, if of considerable area, the epicentral or epifocal tract. This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018). < adj.1898 |
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