New Method for Computing Postseismic Deformations in a Realistic Gravitational Viscoelastic Earth Model
New Method for Computing Postseismic Deformations in a Realistic Gravitational Viscoelastic Earth Model
复制标题
计算真实重力粘弹性地球模型中震后变形的新方法
DOI：
10.1029/2019jb017368
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发表时间：
2019-05
影响因子：
3.9
通讯作者：
Sun Wenke
中科院分区：
文献类型：
--
作者：
Tang He;Sun Wenke
在关于地震引起的静态变形的位错理论得到广泛发展之后，目前的弹性位错理论可以很好地解释同震变形。然而，很难分离和解释来自震间和震后变形的贡献，因为涉及各种机制，包括断层界面的耦合、余震活动、多孔弹性回弹和粘弹性松弛。只有通过对具有密集大地测量网络的地区的震后形变进行多点观测，才有可能推断出地震的主导机制。在真实的地球模型中准确地模拟一个过程是克服这一困难的独特方法。在这里，我们提出了一个新的强大的，准确的，antioscillational方法建模震后变形，是由于粘弹性松弛在一个现实的重力球形地球模型与线性粘弹性流变模型。通过比较Sun和Okubo（1993，https：//doi.org/10.1029/95JB03536）、Tanaka等人（2006 https：//doi.org/10.1111/j.1365-246X.2005.02821.x，2007，https：//doi.org/10.111/j.1365-246X.2007.03486.x）的结果以及我们新导出的分析结果，评估粘弹性位错Love数。我们的新结果和以前的结果之间令人满意的一致性表明，我们提出的方法是高度准确的。这种稳健而精确的正演模拟方法有助于研究和分离震后变形的主要机制，并将极大地有利于从大地测量数据反演地面粘弹性参数。
After extensive development of the dislocation theories regarding static deformations that are due to earthquakes, coseismic deformations can be well explained by the present elastic dislocation theories. However, it is difficult to separate and interpret the contributions from interseismic and postseismic deformations, because various mechanisms are involved, including the coupling of the fault interface, aftershock activity, porous‐elastic rebound, and viscoelastic relaxation. It is only possible to infer the dominant mechanism for an earthquake via multiobservation of postseismic deformations in regions that have a dense geodetic network. Accurately simulating a process in a realistic Earth model is a unique way to overcome this difficulty. Here, we present a new robust, accurate, and antioscillational method for modeling the postseismic deformations that are due to viscoelastic relaxation in a realistic gravitational spherical Earth model with linear viscoelastic rheological models. The viscoelastic dislocation Love numbers are evaluated by comparing the results of Sun and Okubo (1993, https://doi.org/10.1029/95JB03536), those of Tanaka et al. (2006 https://doi.org/10.1111/j.1365-246X.2005.02821.x, 2007, https://doi.org/10.1111/j.1365-246X.2007.03486.x), and our newly derived analytical results. The satisfactory consistency between our new results and previous ones demonstrates that our proposed method is highly accurate. This robust and accurate forward modeling approach is helpful for investigating and separating the major mechanism of the postseismic deformations and will greatly benefit the inverse investigation of the ground viscoelastic parameters from geodetic observations.
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影响因子：
2.7
作者：
GAVER, DP
通讯作者：
GAVER, DP
影响因子：
5.2
作者：
Yusaku Tanaka;K. Heki
通讯作者：
Yusaku Tanaka;K. Heki
影响因子：
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作者：
I. Panet;V. Mikhailov;M. Diament;F. Pollitz;G. King;O. Viron;M. Holschneider;R. Biancale;J. Lemoine
通讯作者：
I. Panet;V. Mikhailov;M. Diament;F. Pollitz;G. King;O. Viron;M. Holschneider;R. Biancale;J. Lemoine
影响因子：
2.4
作者：
Wei Xiong;X. Qiao;Gang Liu;Wei Chen;Zhaosheng Nie
通讯作者：
Wei Xiong;X. Qiao;Gang Liu;Wei Chen;Zhaosheng Nie
影响因子：
2.8
作者：
Rongjiang Wang
通讯作者：
Rongjiang Wang