Changes in electrical resistivity track changes in tectonic plate coupling
Changes in electrical resistivity track changes in tectonic plate coupling
复制标题
电阻率的变化跟踪构造板块耦合的变化
DOI：
10.1002/grl.50959
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发表时间：
2013
影响因子：
5.2
通讯作者：
Y. Ogawa
中科院分区：
文献类型：
--
作者：
W. Heise;T. Caldwell;E. Bertrand;Graham J. Hill;S. Bennie;Y. Ogawa
沿着新西兰北岛东海岸的希库朗吉俯冲边缘的板间耦合从北向南变化，从几乎不耦合到锁定。俯冲界面的富粘土沉积物和含水流体被认为是控制板间耦合的摩擦过程的关键因素。在这里，我们使用大地电磁数据表明，俯冲界面在弱耦合区域是导电的，但在锁定区域是电阻性的。这些结果表明在弱耦合区域存在一层富含流体和粘土的沉积物，并支持界面处流体和水合粘土的存在是控制板块耦合的主要因素的观点。
Interplate coupling on the Hikurangi subduction margin along the east coast of New Zealand's North Island changes north to south from almost uncoupled to locked. Clay‐rich sediments and aqueous fluids at the subduction interface have been invoked as key factors in the frictional processes that control interplate coupling. Here we use magnetotelluric data to show that the subduction interface in the weakly coupled region is electrically conductive but is resistive in the locked region. These results indicate the presence of a layer of fluid‐ and clay‐rich sediments in the weakly coupled region and support the idea that the presence of fluid and hydrated clays at the interface is a major factor controlling plate coupling.