瑞士阿尔卑斯弧附近岩石圈应变率与应力场方向
Lithosphere strain rate and stress field orientations near the Alpine arc in Switzerland
AI总结：
本研究测试了瑞士境内应变率与应力张量主分量的对齐情况，发现HNL是划分地壳应力与地表应变率方向的构造边界，且T轴与软流圈长期应变在阿尔卑斯弧尺度上一致，但Basel、Swiss Jura和Ticino三地因低变形或低地震活动性而存在地表变形与地震活动的不匹配。
摘要：
在本研究中，我们测试了应变率与应力张量的主分量在瑞士境内是否对齐。我们发现：1）Helvetic Nappes line (HNL) 是定义地壳应力/地表应变率方向不同区域的相关构造边界；2）在瑞士阿尔卑斯弧的尺度上，T轴（来自矩张量解）的方向与长期软流圈累积有限应变（来自SKS剪切波分裂）相一致。在更局部的尺度上，我们发现地震活动与地表变形总体一致，但在三个区域（Basel、Swiss Jura和Ticino）例外；这可能是因为变形和/或地震活动水平较低。在Basel地区，存在深部地震活动但缺乏地表变形。在Ticino和Swiss Jura地区，地震活动几乎不存在，但检测到的地表变形水平约为2×10E-8/yr（约6.3×10E-16/s）。
英文摘要：
In this study we test whether principal components of the strain rate and stress tensors align within Switzerland. We find that 1) Helvetic Nappes line (HNL) is the relevant tectonic boundary to define different domains of crustal stress/surface strain rates orientations and 2) orientations of T- axes (of moment tensor solutions) and long-term asthenosphere cumulative finite strain (from SKS shear wave splitting) are consistent at the scale of the Alpine arc in Switzerland. At a more local scale, we find that seismic activity and surface deformation are in agreement but in three regions (Basel, Swiss Jura and Ticino); possibly because of the low levels of deformation and/or seismicity. In the Basel area, deep seismicity exists while surface deformation is absent. In the Ticino and the Swiss Jura, where seismic activity is close to absent, surface deformation is detected at a level of ~2 10E-8/yr (~6.3 10E-16/s).
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