2次元フィルター法による重力ゾーニング

抄録

Fitlering techniques separate a gravity map into short- and long-wavelength ones. It can be concluded on the basis of gravity and topography data that terrain masses of wavelength shorter than 160 km are sustained by an elastic strength of the crust but those of longer wavelength are balanced in an isostatic equilibrium with the crustal thickness. In this paper, we use a two-dimensional Box-car window as a low-pass filter with its application to gravity zoning of the Japan island-arcs. We see a clearcut zone arrangement of positive and negative gravity anomalies along the island-arcs.