Relationship between the InSAR-measured uplift, the structural framework, and the present-day stress field at Lazufre volcanic area, central Andes
Relationship between the InSAR-measured uplift, the structural framework, and the present-day stress field at Lazufre volcanic area, central Andes
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安第斯山脉中部拉祖弗雷火山区 InSAR 测量的隆起、构造框架和现今应力场之间的关系
DOI：
10.1016/j.tecto.2010.06.003
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发表时间：
2010
期刊：
影响因子：
2.9
通讯作者：
Walter TR
中科院分区：
文献类型：
--
作者：
Ruch J;Walter TR
构造活动区的应力状态和构造组构控制着岩浆岩储层的形态和岩脉的方向。因此，次火山结构提供了潜在的良好指标，以评估随着时间的推移区域地球动力学过程。我们分析了时空演变的拉祖弗雷火山区在中部安第斯山脉，在1997年开始的区域尺度的椭圆形面积的表面变形。卫星雷达干涉测量（干涉合成孔径雷达）观测到的形变信号可以用位于约10 km深处的岩浆侵入体来解释。我们比较了这个拉长的变形区域与附近的几个火山结构。我们发现，一个更高的浓度的火山口位于变形区相比，周围地区。火山构造的平均走向为NW-SE（N129°），几乎垂直于变形椭圆率的平均伸长（N28°）。应用钻孔崩落的概念，我们提出了一个统一的模型，解释岩浆活动在短期（干涉合成孔径雷达）和长期（火山形态参数）：最大水平压应力（SH）的西北-东南方向被发现是恒定的时间和空间，是占主导地位的侵入体的深度和表面附近。产生重要的影响，如主应力方向的时间稳定性和显着的作用，在应力场分析中的地形载荷。
The stress regime and structural fabric in tectonically active areas control the shape of magmatic reservoirs and the orientation of dikes. Hence sub-volcanic structures provide potentially good indicators to assess regional geodynamic processes through time. We analyse the spatiotemporal evolution of the Lazufre volcanic area in the central Andes, where a regional-scale elliptical area of surface deformation commenced in 1997. The deformation signal observed by satellite radar interferometry (InSAR) can be explained by a magmatic intrusion located at approximately 10km depth. We compare this elongated region of deformation with several nearby volcanic structures. We find that a higher concentration of volcanic vents is located within the deforming area compared to the surrounding region. Furthermore, the mean alignment of volcanic structures is NW–SE (N129°), almost perpendicular to the mean elongation of the deformation ellipticity (N28°). Applying the borehole breakout concept, we propose a unifying model that explains magmatic activity both at the short-term (InSAR) and long-term (volcano morphometric parameters): a maximum horizontal compressive stress (SH) oriented NW–SE is found to be constant in time and in space, and is dominant both at the depth of the intrusion and near the surface. Important implications arise, such as the temporal stability of the principal stress directions and the significant role of topographic loading in the stress field analysis.
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.jvolgeores.2006.04.018
发表时间：
2006-11
影响因子：
2.9
作者：
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通讯作者：
C. Corazzato;A. Tibaldi
应力场对岩浆房稳定性和塌陷火山口形成的影响
影响因子：
4.2
作者：
W. Bosworth;K. Burke;M. Strecker
通讯作者：
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