Structure and State of Stress of the Chilean Subduction Zone from Terrestrial and Satellite-Derived Gravity and Gravity Gradient Data
Structure and State of Stress of the Chilean Subduction Zone from Terrestrial and Satellite-Derived Gravity and Gravity Gradient Data
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根据地面和卫星重力和重力梯度数据得出的智利俯冲带的结构和应力状态
DOI：
10.1007/s10712-014-9296-9
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发表时间：
2014
影响因子：
4.6
通讯作者：
Zeumann
中科院分区：
文献类型：
--
作者：
Gutknecht;Götze;Jentzsch;Mahatsente;Zeumann
众所周知，地球岩石圈重力模型的质量在很大程度上取决于有限的可用地球重力数据。然而，最近，在地球科学界，利用均匀测量的卫星重力和重力梯度数据进行岩石圈尺度建模的兴趣越来越大。在这里，我们提出了一个跨学科的方法来确定的应力状态和变形率在中央安第斯俯冲系统。我们采用了来自陆地，卫星和组合源的重力数据，使用多种方法来约束应力，应变和重力势能（GPE）。使用组合区域重力模型IMOSAGA 01C（Hosse等人，Surv Geophys，2014年，本期）进行部分优化的良好约束的3D密度模型被用作计算俯冲海洋纳斯卡板块顶部和GPE相对于岩石圈底部的应力异常的基础。三维密度模型的几何形状和物理参数用于计算动态建模中的应力和隆升率。应力分布，来自静态和动态模拟，揭示了明显的正异常高达80 MPa沿着沿海侏罗纪岩基带。这些异常与俯冲系统浅部的主要地震活动有很好的相关性。此外，安第斯会聚带的应力分布模式沿着南北和东西两个方向变化，表明大陆前弧是高度分段的。GPE的估计表明，高中央安第斯山脉可能处于水平偏张力状态。利用重力场和稳态海洋环流探测器（GOCE）卫星使命的重力梯度模型计算了海拔8公里处的布格样梯度异常。分析表明，GOCE的数据增加了重要价值的岩石圈结构的解释，适当的地形校正应用。
It is well known that the quality of gravity modelling of the Earth’s lithosphere is heavily dependent on the limited number of available terrestrial gravity data. More recently, however, interest has grown within the geoscientific community to utilise the homogeneously measured satellite gravity and gravity gradient data for lithospheric scale modelling. Here, we present an interdisciplinary approach to determine the state of stress and rate of deformation in the Central Andean subduction system. We employed gravity data from terrestrial, satellite-based and combined sources using multiple methods to constrain stress, strain and gravitational potential energy (GPE). Well-constrained 3D density models, which were partly optimised using the combined regional gravity model IMOSAGA01C (Hosse et al. in Surv Geophys, 2014, this issue), were used as bases for the computation of stress anomalies on the top of the subducting oceanic Nazca plate and GPE relative to the base of the lithosphere. The geometries and physical parameters of the 3D density models were used for the computation of stresses and uplift rates in the dynamic modelling. The stress distributions, as derived from the static and dynamic modelling, reveal distinct positive anomalies of up to 80 MPa along the coastal Jurassic batholith belt. The anomalies correlate well with major seismicity in the shallow parts of the subduction system. Moreover, the pattern of stress distributions in the Andean convergent zone varies both along the north–south and west–east directions, suggesting that the continental fore-arc is highly segmented. Estimates of GPE show that the high Central Andes might be in a state of horizontal deviatoric tension. Models of gravity gradients from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite mission were used to compute Bouguer-like gradient anomalies at 8 km above sea level. The analysis suggests that data from GOCE add significant value to the interpretation of lithospheric structures, given that the appropriate topographic correction is applied.
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DOI：
--
发表时间：
1998
期刊：
影响因子：
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作者：
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影响因子：
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DOI：
--
发表时间：
2005
期刊：
Geological Society Special Publication
影响因子：
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作者：
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