The fundamental nature of a transient elastic response to prompt gravity perturbations
The fundamental nature of a transient elastic response to prompt gravity perturbations
复制标题
瞬态弹性响应对重力扰动的基本性质
DOI：
10.1093/gji/ggz196
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Kimura M
中科院分区：
文献类型：
--
作者：
Kame N;Kimura M
地震辐射的地震波会引起地球质量的重新分布，这反过来又会在地震波到达之前在所有距离产生瞬时重力扰动。在这里，我们得到了一个解析解的瞬态弹性响应的提示重力扰动引起的地震质量的重新分布的一部分，在一个无限均匀各向同性非自引力弹性介质。这个解决方案揭示了一个不寻常的净内力自由变形制度之间出现的地震和P波的到来，我们发现在一定的距离与平方反比定律的行动固有的基本性质。这些结果提供了物理的见解，为什么重力仪安装在地球上的特点是显着降低灵敏度地震引起的即时重力扰动。
Seismic waves radiated from an earthquake induce mass redistribution in the Earth, which in turn generates prompt gravity perturbations at all distances before the arrival of seismic waves. Here, we obtain an analytic solution for the transient elastic response to prompt gravity perturbations induced by a portion of earthquake mass redistribution in an infinite homogeneous isotropic non-self-gravitation elastic medium. This solution reveals the fundamental nature of an unusual net-inner-force-free deformation regime that emerges between the onset of an earthquake andP-wave arrival, which we find inherent in action at a distance with the inverse-square law. These results provide physical insights into why a gravimeter installed in the Earth is characterized by significantly decreased sensitivity to earthquake-induced prompt gravity perturbations.