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Title :FACTORS CONTROLLING PRECISION OF 3D STRAIN ANALYSIS USING ELLIPSOIDAL PASSIVE MARKERS
Title alternative :楕円体パッシブマーカーを用いた3次元歪み解析の精度に影響する因子
Authors :Hayashi, Daigoro
Authors alternative :林, 大五郎
Issue Date :25-Sep-1999
Abstract :Three series of model are prepared to examine what factor controls the precision of strain where the axial ratio of initial strain marker ellipsoids is assumed to scatter as a normal distribution. The average method is used to analyze the 3D strain of the present simulation. Three series of model are produced to test three factors; (1) sample size of markers, (2) mean of axial ratio of makers and (3) standard deviation of axial ratio of markers. The simulation is performed in three deformational fields; pure shear of plane strain, isochoric transpression and simple shear of plane strain. Results of the simulation are; (1) When the sample size of the initial strain marker ellipsoids is large, the precision of strain analysis is high. But the precision does not change over 300 sample size. (2) When the mean of axial ratio of the initial strain marker ellipsoids closes to unity, the precision of strain analysis is high. (3) If the standard deviation of axial ratio of the initial strain marker ellipsoids becomes smaller than unity, the precision of strain analysis becomes high. (4) These results hold almost in the same way for the three deformational fields. The exception is; the strain precision becomes high during the progress of deformation under the transpression and the simple shear, though the precision does not change during deformation under the pure shear.
passiveな楕円体の歪マーカーを用いた平均法による3次元歪解析の精度が、初期歪マーカー楕円体の軸比が正規分布する場合に、3つの因子(1)マーカーの数(2)マーカーの軸比の平均(3)マーカーの軸比の標準偏差、とどう関係しているかを調べた。変形場としては(i)純粋剪断(ii)体積変化のないtranspression(iii)単純剪断、の3つを仮定した。結果は(1)歪マーカーの数が多いほど歪解析の精度が高い。しかし歪マーカーの数が300をこえると精度に変化はない。(2)歪マーカーの軸比の平均が1に近いほど、歪解析の精度は高い。(3)歪マーカーの軸比の標準偏差が小さいほど歪解析の精度は高い。これらの結果は3つの変形場でほぼ同様に成立する。しかしtranspressionと単純剪断では、変形につれ歪解析の精度は高くなるが、純粋剪断では変形につれて精度は変化しない。
Type Local :雑誌掲載論文
ISSN :0388-502X
Publisher :日本情報地質学会
URI :http://hdl.handle.net/20.500.12000/2948
Citation :情報地質 = Geological data processing (Geoinformatics) Vol.10 no.3 p.129 -142
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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