重力異常から推定された飛騨山脈下超低密度域の三次元分布

概要

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A three-dimensional density structure in the shallower crust beneath the Hida Mountains, central Japan, is estimated by using gravity data. We employed seismic velocity structure models both as an initial condition and constraints of gravity structure models. We estimated that an extremely low-density body (density is smaller than 2.1 g/cm^3) exists at 4-8 km depth (2 to 6 km below the sea level) beneath Mt. Tateyama (3,015 m) and also along the Hida mountains. Estimated horizontal extent of the body is about 14 km in east to west, about 28 km in north to south directions, respectively, and about 4 km in thickness. The volume of the body is about 1,000 km^3. Spatial distribution of the extremely low-density body is well consistent with a low velocity region estimated from studies of seismic tomography.
特定非営利活動法人日本火山学会の論文
2002-11-29