Roughness,Multiscale Analysis And Analogous Research Of Seamounts On The Caroline Ridge,West Pacific

Along with the development of high-resolution seafloor surveying technologies,the geomorphological analysis of seamounts has become a hotspot in submarine geomorphology,which possesses much scientific meaning.However,most studies on seamount geomorphology are still qualitative or half-quantitative,and the roughness and multiscale analysis of seamounts have seldom been discussed.Based on high-resolution DEM data,the geomorphological units of guyot M4 on the Caroline Ridge in West Pacific are classified in this research.Spectral analysis and Multifractal Detrended Fluctuation Analysis(MFDFA)were applied to obtain the roughness and multiscale features of M4.The result shows that there are two characteristic scales(0.3?1km and 7?20km)in the topography of M4,and the small-scale roughness is correlated with the slope gradients.The topography of M4 is multifractal and the strength of multifractality varies with the locations of topographic profiles.The multifractal features can be perfectly described by multifractal spectrum parameters(the maximum singularity exponent?₀,the spectrum width W and the degree of symmetry B).The guyot and other landforms with flat tops are featured by higher?₀,while areas with strong small-scale fluctuations(e.g.gullies)tend to have negative B.Combined with DEM data of an adjacent seamount M2,50 terrestrial volcanoes and 15Martian volcanoes,analogous analysis was applied on volcanoes in different geological environments.With similar characteristic scales,earth volcanoes(both seamounts and terrestrial volcanoes)have a linear relationship between the basal radii d and heights h:h=0.08d+1.72.The MFDFA result shows that seamounts and Martian volcanoes have similar values of?₀.Besides,seamounts and terrestrial volcanoes have similar values of W,and their Hurst exponents H and standard deviations of slope?_s have a linear relationship?_s=-8.46 H+16.These phenomena could be attributed to the discrepancies of erosional-depositional processes in different environments.