ETH-Zurich, SEG, Sonneggstrasse 5, 8092, Zürich, Switzerland.
ETH-Zurich, MPG, HPV G 53, Robert-Gnehm-Weg 15, 8093, Zürich, Switzerland.
Sci Rep. 2018 Jan 31;8(1):2018. doi: 10.1038/s41598-018-20253-z.
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 10/yr (6.3 10/s).
在这项研究中，我们测试了瑞士境内应变率张量和应力张量的主分量是否一致。我们发现：1）阿尔卑斯造山带中的赫尔维蒂构造结（HNL）是划分地壳应力/地表应变速率方向不同区域的相关构造边界；2）矩张量解的 T 轴（T-轴）方向和长期软流圈累积有限应变（来自 SKS 剪切波分裂）在瑞士阿尔卑斯弧形区的尺度上是一致的。在更局部的尺度上，我们发现地震活动和地表变形是一致的，但在三个地区（巴塞尔、瑞士汝拉和提契诺）存在差异；这可能是因为变形和/或地震活动水平较低。在巴塞尔地区，存在深部地震活动，而地表变形则不存在。在提契诺和瑞士汝拉地区，地震活动几乎不存在，但地表变形的水平达到约 2 10/yr（~6.3 10/s）。
