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subcrustal
subcrustal adj.
Brit. 
/ˌsʌbˈkrʌstl/
, /ˌsʌbˈkrʌstl/U.S. /ˌsəbˈkrəst(ə)l/
Geology situated or taking place beneath the crust of the earth./ˌsəbˈkrəst(ə)l/ΚΠ
1884 Science 7 Mar. 292/2 The queries arise..whether, after general incrustation, the crustal arrest of radiation must not have speedily diminished sub-crustal influence to such an extent that climate depended chiefly on solar radiation.
1898 Geogr. Jrnl. Nov. 545 Volcanic outflow of subcrustal molten matter.
1954 J. F. Kirkaldy Gen. Princ. Geol. xv. 220 Numerous theories.., the most important being those invoking either contraction of the Earth's surface, the development of sub-crustal currents or continental drift.
1990 P. Kearey & F. J. Vine Global Tectonics xi. 259 The Trough was initiated when a crack in the subcrustal lithosphere developed and asthenospheric material rose and spread laterally at the crust-mantle interface.
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