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megashear
megashear n.
Brit. 
/ˈmɛɡəʃɪə/
, /ˈmɛɡəʃɪə/U.S. /ˈmɛɡəˌʃɪ(ə)r/
[ < mega- comb. form + shear n.2] Geology a transcurrent fault in which the displacement is greater than the thickness of the crust./ˈmɛɡəˌʃɪ(ə)r/ΘΚΠ
the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > fault > other types of fault
heave1802
reversed fault1852
reverse fault1865
step-fault1879
ring fracture1881
overfault1883
overlap fault1883
overthrust1883
trough fault1883
thrust1888
thrust-fault1889
offset1897
cross-fault1900
tear-fault1900
distributive fault1904
cross-break1909
slide1910
strike-slip fault1913
rift1921
splay fault1942
wrench fault1951
megashear1954
transform fault1965
transform1971
1954 S. W. Carey in News Bull. Geol. Soc. Austral. July 1 The known megashears, where orogens are displaced hundreds of km., were next examined.
1971 Nature 2 July 23/1 We regard these two [American] plates as distinct entities separated mainly by the Cayman-Puerto Rico megashear.
1994 Bull. Geol. Soc. Amer. 106 214/3 In direct contrast to the Late Devonian left-lateral megashear models, this motion would link to a large-scale dextral motion between Scandinavia and Greenland in Late Devonian time.
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