Moho Depth

The Parker-Oldenburg inversion algorithm is defined as follows: $$h(x)=F^{-1}(\frac{-F[\Delta g(x)]e^{-kz_0}}{2\pi G \rho}-\displaystyle\sum_{n=2}^{\infty} \frac{k^{n-1}}{n!}F[h^{n}(x)])$$ Where F is the Fourier transform operator; ∆g(x) is gravity anomaly; h(x) is the depth to the interface; k is the wavenumber; G is the gravitational constant; ρ is the density contrast across the interface; and z0 is the average depth of the horizontal interface. According to this algorithm, the topography of the interface density can be estimated by an iterative inversion procedure.

The Moho discontinuity is the boundary between the Earth's crust and the underlying mantle. The Moho depth in different zones of Iran has been estimated by various approaches like analysis of receiver function method according to teleseismic waves recorded in seismic stations; inversion of terrestrial gravity data and using Bouguer gravity anomaly and free air gravity anomaly; spectral correlation analysis of terrain gravity effects; thermal analysis and using geoid height; Parker-Oldenburg method; Least squares Collection.