论文标题
由地壳岩石中自发的局部流体流控制的破裂和后置后置后置的后流
Rupture and afterslip controlled by spontaneous local fluid flow in crustal rock
论文作者
论文摘要
晶体岩石（如花岗岩）中的剪切破裂和断层滑动产生了较大的扩张，从而影响地震循环中外壳中流体压力的时空演化。为了探索流体压力变化与岩石变形和断层滑动的耦合，我们在上皮条件下进行了实验室实验，同时监测声学排放和原位流体压力。我们的结果显示了两个单独的断层阶段：初始破裂繁殖，与较大的膨胀有关，并被局部流体压降稳定，然后在新形成的断层上滑动，并通过断层壁上的局部流体压力充电促进。后一个阶段以前尚未得到认可，可以理解为流体诱导后的后置，与主破裂贴片合作。将我们的实验室结果提高到自然量表，我们期望自发的断层区域充电可能导致主要地壳断层局部扩张区域的早期下滑，而与大规模的流体流动模式无关。
Shear rupture and fault slip in crystalline rocks like granite produce large dilation, impacting the spatiotemporal evolution of fluid pressure in the crust during the seismic cycle. To explore how fluid pressure variations are coupled to rock deformation and fault slip, we conducted laboratory experiments under upper crustal conditions while monitoring acoustic emissions and in situ fluid pressure. Our results show two separate faulting stages: initial rupture propagation, associated with large dilatancy and stabilised by local fluid pressure drops, followed by sliding on the newly formed fault, promoted by local fluid pressure recharge from the fault walls. This latter stage had not been previously recognised and can be understood as fluid-induced afterslip, co-located with the main rupture patch. Upscaling our laboratory results to the natural scale, we expect that spontaneous fault zone recharge could be responsible for early afterslip in locally dilating regions of major crustal faults, independently from large-scale fluid flow patterns.
