Discontinuity 2
Discontinuity 2 :
A boundary (interface) between adjacent media of different physical properties, such as density, wave propagation velocity and/or others (e.g., the Mohorovičić discontinuity). One may differentiate between sharp first order discontinuity (with rapid or step-like changes) and second order discontinuities with gradual changes of such properties. It depends on the ratio between wavelength λ and the thickness d of the transition zone between the two media whether seismic waves “sense” a discontinuity as being “sharp” (λ >> d) or gradual (d >> λ)
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