Co‐seismic deformation and post‐glacial slip rate along the Magallanes‐Fagnano fault, Tierra Del Fuego, Argentina
Co‐seismic deformation and post‐glacial slip rate along the Magallanes‐Fagnano fault, Tierra Del Fuego, Argentina
复制标题
阿根廷火地岛麦哲伦-法尼亚诺断层沿线的同震变形和冰期后滑动率
作者：
Sandrine Roy;R. Vassallo;J. Martinod;M. Ghiglione;C. Sue;P. Allemand
在巴塔哥尼亚的最南端，马加拉内斯-法尼亚诺断层（MFF）容纳了南美洲和斯科舍板块之间的左行相对运动。在本文中，我们提出了一个更新的观点，在火地岛MFF露头的东部部分的几何形状。我们根据变形类型将MFF细分为八个部分，使用现场制图和高分辨率图像的解释。我们量化同震破裂的最强记录1949年，Mw7.5地震，并确定其东部终止。我们在人造特征中识别出几个同震偏移，显示出高达6.5 m的左移，大于先前估计的值。使用10 Be宇宙成因核素深度剖面，我们对冰后期形态的累积偏移进行了测定，并估计了东部MFF的长期滑动速率。我们量化了6.4 ± 0.9 mm/a的左侧断层滑动速率，该速率与大地速度重叠，表明自更新世以来断层行为稳定。
Across the extreme south of Patagonia, the Magallanes‐Fagnano Fault (MFF) accommodates the left‐lateral relative motion between South America and Scotia plates. In this paper, we present an updated view of the geometry of the eastern portion of the MFF outcropping in Tierra del Fuego. We subdivide the MFF in eight segments on the basis of their deformation styles, using field mapping and interpretation of high‐resolution imagery. We quantify coseismic ruptures of the strongest recorded 1949, Mw7.5 earthquake, and determine its eastern termination. We recognize several co‐seismic offsets in man‐made features showing a sinistral shift up to 6.5 m, greater than previously estimated. Using 10Be cosmogenic nuclides depth profiles, we date a cumulated offset in post‐glacial morphologies and estimate the long‐term slip rate of the eastern MFF. We quantify a 6.4 ± 0.9 mm/a left‐lateral fault slip rate, which overlaps geodetic velocity and suggests stable fault behaviour since Pleistocene.
来自重复 GPS 观测的火地岛 MagallanesâFagnano 断层系统当今地壳变形
影响因子：
2.8
作者：
Mendoza;R. Perdomo;J.L. Hormaechea;D. Del Cogliano;M. Fritsche;A. Richter;R. Dietrich
通讯作者：
R. Dietrich
影响因子：
2.9
作者：
L. Mendoza;A. Richter;M. Fritsche;J. Hormaechea;R. Perdomo;R. Dietrich
通讯作者：
L. Mendoza;A. Richter;M. Fritsche;J. Hormaechea;R. Perdomo;R. Dietrich