Strain rotation coupling and its implications on the measurement of rotational ground motions

Strain rotation coupling and its implications on the measurement of rotational ground motions
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应变旋转耦合及其对旋转地面运动测量的影响

DOI:
10.1007/s10950-012-9296-5
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发表时间:
2012
影响因子:
1.6
通讯作者:
H. Igel
H. Igel
中科院分区:
地球科学4区
文献类型:
--
作者:
van Driel;J. Wassermann;M. F. Nader;B. S. A. Schuberth;H. Igel

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已知地震波场的空间导数对各种场地效应敏感(例如,空洞效应、地形和地质不均匀性)。在这项研究中,重点是应变旋转耦合,可能会导致显着差异点测量相比,阵列衍生的旋转运动。应变旋转耦合常数估计的基础上有限元模拟的非均匀介质,以及周围的3D地形Wettzell,德国(G环激光器的位置)。使用同位阵列和环形激光器的数据,环形激光器本身的耦合常数是小的。示出了几个例子来说明应变引起的旋转可能在火山的近场以及在远场和低频频谱(自由振荡)的地震图的数量级。
Spatial derivatives of the seismic wave field are known to be sensitive to various site effects (e.g., cavity effects, topography, and geological inhomogeneities). In this study, the focus is on strain rotation coupling that can cause significant differences between point measurements compared to array-derived rotational motions. The strain rotation coupling constants are estimated based on finite element simulations for inhomogeneous media as well as for the 3D topography around Wettzell, Germany (the location of the G ring laser). Using collocated array and ring laser data, the coupling constants of the ring laser itself are shown to be small. Several examples are shown to illustrate the order of magnitude that strain-induced rotation might have on the seismograms in the near field of volcanoes as well as in the far field and in the low-frequency spectrum (free oscillations).
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