Results of direct shear experiments on intact and powdered samples from the submarine flank of Kilauea volcano (Hawaii, USA)@en

We performed laboratory friction experiments on simulated fault gouges and intact samples from the submarine flank of Kilauea volcano (Hawaii, USA) and measured the velocity-dependence of friction in velocity-step tests. Moreover, we have directly measured cohesion on the fault gouge and intact samples from Kilauea's submarine flank. The experiments were carried out using a single-direct shear device at room temperature. For the shearing tests, the samples simulating fault gouge were crushed and sieved to a grain size of < 125 µm. The intact samples were tested as mini-cores. All experiments were carried out under fluid-saturated conditions (3.5 % NaCl brine) and under an effective normal load of 10 MPa.本研究针对美国夏威夷基拉韦厄火山海底侧翼的模拟断层泥与完整岩样开展了实验室摩擦实验，并通过速度步长实验（velocity-step tests）测定了摩擦的速度依赖性。此外，我们还直接测定了基拉韦厄火山海底侧翼断层泥与完整岩样的内聚力。本实验于室温条件下采用单直接剪切装置（single-direct shear device）完成。针对剪切实验，模拟断层泥的岩样需经粉碎、过筛处理，粒径控制在125微米以下；完整岩样则以微型岩心的形式开展测试。所有实验均在流体饱和条件（3.5%氯化钠盐水）以及10MPa有效法向荷载下进行。