Earthquakes in the western Alpine mantle wedge
Earthquakes in the western Alpine mantle wedge
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DOI：
10.1016/j.gr.2016.11.012
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发表时间：
2017-04
影响因子：
6.1
通讯作者：
M. Malusà;Liang Zhao-;E. Eva;S. Solarino;A. Paul;S. Guillot;S. Schwartz;T. Dumont;C. Aubert;S. Salimbeni;S. Pondrelli;Qingchen Wang;R. Zhu
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文献类型：
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作者：
M. Malusà;Liang Zhao-;E. Eva;S. Solarino;A. Paul;S. Guillot;S. Schwartz;T. Dumont;C. Aubert;S. Salimbeni;S. Pondrelli;Qingchen Wang;R. Zhu
长期以来，由于地震成像和年轻碰撞带地震位置的低分辨率，对浅层大陆地幔地震活动的评估一直受到阻碍。在这里，我们将西阿尔卑斯山岩石圈结构的最新高分辨率图像与过去25年来在同一地区记录的高质量异常深层地震数据集结合起来。我们表明这些地震是在一个活跃的岩石圈走滑断层上排列的，我们提供的证据表明该断层位于亚得里亚海莫霍下的地幔楔。我们的研究结果：(1)提供了直接的证据，表明深部物质是否可孕震取决于岩性；（ii）确认蛇纹岩化作用有利于地幔岩石的地震蠕变；(3)表明，不仅在冷克拉通，在年轻造山带，上地幔也可能是刚性的，并可能发生地震。
The assessment of seismic activity in the shallow continental mantle has long been hindered by the low resolution of both seismic imaging and earthquake locations in young collision zones. Here, we combine the most recent and high-resolution image of the lithospheric structure of the Western Alps with a high quality dataset of anomalously deep earthquakes recorded in the same area in the past 25 yrs. We show that these earthquakes are aligned on an active lithospheric strike-slip fault, and we provide evidence that this fault is located in the mantle wedge beneath the Adriatic Moho. Our results: (i) provide direct evidence that deep material can be seismogenic or not depending on the lithology; (ii) confirm the role of serpentinization in favoring the aseismic creep of mantle rocks; and (iii) demonstrate that the upper mantle can be stiff and seismogenic not only in cold cratons, but also in young orogenic belts.