Densely Sampled Global Dynamic Topographic Observations and Their Significance

Topography and bathymetry are principally supported by some combination of crustal sub-crustal density variations. However, dynamic topography is generated vertical deflection the Earth's surface as a result mantle convection. Isolating quantifying observable yields valuable information about processes. Here, we investigate global calculating residual depth anomalies throughout oceanic realm topographic across continents. We correct for sedimentary loading exploiting variety seismologic datasets that include seismic reflection profiles, wide-angle/refraction surveys, receiver functions. In this way, an extensively revised augmented compilation 10,874 measurements 3,777 continental constructed. realm, methodology has been to improve accuracy resolution. First, quartz/clay content column adjusted remove minor skewness function plate age. Secondly, variation bulk thickness taken into account. Our used generate spherical harmonic representations out degree 40 (i.e., ∼1,000 km). Resultant spectra demonstrate power varies linearly with inverse wavenumber. The spectral slope directly reflects way which Stokes' flow. results consistent independent diverse geologic markers uplift subsidence together Neogene-Quaternary intraplate basalt magmatism.