台湾・竹崎観測室で観測された非等方性潮汐歪 [in Japanese] Inhomogeneous Tidal Strains Observed at the Chu-Chie Station, Taiwan [in Japanese]
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Tidal strains observed at the Chu-Chie station, Taiwan, had the largest deviation in the NW-SE direction from the predicted tidal strains. When the elasticity of the surrounding crust was examined by using the observed tidal strains, the minimum and maximum Young's modulus were calculated to be 13 GPa in the N52W-S52E direction and 48 GPa in the N38ES38W direction, respectively. It was considered that the anisotropic elasticity might be caused by local disturbances such as topographical and geological effects. At first, we exam ined a topographical effect with FEM. In the stress-strain relation modified by the topog raphical effect, the minimum and maximum Young's modulus were obtained to be 28 GPa in the N22W-522E direction and 36 GPa in the N68E-S68W, respectively. The topographical ef fect was insufficient to explain the anisotropic elasticity estimated from the tidal strains. Secondary, we considered the influence of fractures in the crust. The Chu-Chie station is located in the fracture zone which strikes NE-SW. Stress along to the fracture zone causes less strain change at the station than the perpendicular stress, because stress along to the fracture zone is sustained by the surrounding crust with few fractures. It is considered that the Young's modulus 13 GPa and 48 GPa estimated from tidal strains indicate the striped structure of the crust.
- Journal of the Geodetic Society of Japan
Journal of the Geodetic Society of Japan 52(2), 103-113, 2006-06-25
The Geodetic Society of Japan