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Continent-ocean boundary
The Continent-ocean boundary (COB) or continent-ocean transition is the boundary between continental crust and oceanic crust on a passive margin. The identification of continent-ocean boundaries is important in the definition of plate boundaries at the time of break-up when trying to reconstruct the geometry and position of ancient continents e.g. in the reconstruction of Pangaea.
==Techniques used in identification==
* Gravity data inversion - Moho depth can be derived by the inversion of satellite gravity data and thereby crustal thickness〔("Mapping Arctic Crustal Thickness and Ocean-Continent Transition using Gravity Inversion with a Lithosphere Thermal Correction" ) Kusznir, N.J. Alvey, A., Lebedeva-Ivanova, N., Gee, D., Gaina, C. & Torsvik, T.H. 2008.〕
* Magnetic stripe data - Most areas of oceanic crust show characteristic stripes due to periodic magnetic reversals during formation at a mid-oceanic ridge. The continental crust is by contrast typically magnetically quiet.
* Wide-angle seismic refraction and reflection data - These data give a precise location for the COB by determining the P-wave velocities along a profile. The two types of crust have distinct P-wave velocities.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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