DISPLACEMENTS AND TILTS FROM DIP-SLIP FAULTS AND MAGMA CHAMBERS BENEATH IRREGULAR SURFACE-TOPOGRAPHY
DISPLACEMENTS AND TILTS FROM DIP-SLIP FAULTS AND MAGMA CHAMBERS BENEATH IRREGULAR SURFACE-TOPOGRAPHY
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DOI：
10.1029/gl015i006p00601
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发表时间：
1988-06-01
影响因子：
5.2
通讯作者：
SEGALL, P
中科院分区：
文献类型：
--
作者：
MCTIGUE, DF;SEGALL, P
由于埋藏变形源引起的地表位移和倾斜受地形影响。在二维弹性介质中，确定了倾滑断层（边缘位错）和岩浆体（膨胀线）的首阶修正量，该修正量是由任意剖面但斜率较小的地形引起的。垂直位移修正是地形和水平正应变的乘积，水平正应变是由源在平坦半空间中引起的。在理想化的盆岭地形下，正断层的校正是山脉一侧隆起的轻微增加。地形对对称火山下的膨胀线的影响是减小中心隆起。如果不考虑地形的影响，可能会使震源深度和几何形状的估计产生偏差。
Surface displacements and tilts due to buried deformation sources are influenced by topography. The leading‐order corrections due to topography of arbitrary profile, but small slope, are determined for dip‐slip faults (edge dislocations) and magma bodies (lines of inflation) in a two‐dimensional elastic medium. The vertical displacement correction is simply the product of the topography and the horizontal normal strain due to the source in a flat half‐space. The correction for a normal fault beneath an idealized basin‐and‐range topography is a slight increase in the uplift on the range side. The effect of topography for a line of inflation beneath a symmetric volcano is to reduce the central uplift. Failure to account for topographic influences can bias estimates of source depth and geometry.