An analytical approach to estimate curvature effect of coseismic deformations

An analytical approach to estimate curvature effect of coseismic deformations
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估计同震变形曲率效应的分析方法

DOI:
10.1093/gji/ggw215
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发表时间:
2016-08
影响因子:
2.8
通讯作者:
Wang Rongjiang
Wang Rongjiang
中科院分区:
地球科学2区
文献类型:
--
作者:
Dong Jie;Sun Wenke;Zhou Xin;Wang Rongjiang

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本文提出了一种计算曲率效应的解析方法,该方法是由均质球模型的同震变形的新解析解导出的。我们考虑两个半径不同的球体:一个与地球相同,另一个半径较大,可以近似于半空间模型。然后,我们计算了两个球的同震位移,并将位移的相对百分比定义为曲率效应。近场曲率效应是相对于最大同震位移来定义的。结果表明,在震源深度小于100 km时,最大曲率效应约为4%,震源深度小于600 km时,最大曲率效应约为30%。对于远场曲率效应,我们定义它相对于观测点。曲率效应非常大,有时超过100%。此外,这种新方法可用于定量估计任何行星的曲率效应。对于一个较小的球体,如月球,曲率效应比地球大得多,与地球的半径成反比。
We present an analytical approach to compute the curvature effect by the new analytical solutions of coseismic deformation derived for the homogeneous sphere model. We consider two spheres with different radii: one is the same as earth and the other with a larger radius can approximate a half-space model. Then, we calculate the coseismic displacements for the two spheres and define the relative percentage of the displacements as the curvature effect. The near-field curvature effect is defined relative to the maximum coseismic displacement. The results show that the maximum curvature effect is about 4 per cent for source depths of less than 100 km, and about 30 per cent for source depths of less than 600 km. For the far-field curvature effect, we define it relative to the observing point. The curvature effect is extremely large and sometimes exceeds 100 per cent. Moreover, this new approach can be used to estimate any planet's curvature effect quantitatively. For a smaller sphere, such as the Moon, the curvature effect is much larger than that of the Earth, with an inverse ratio to the earth's radius.
DOI: 10.1111/j.1365-246x.1968.tb00234.x
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