Sultan Nabil, Murphy Shane, Riboulot Vincent, Géli Louis
Geo-Ocean UMR6538, Ifremer, CNRS, UBO, UBS, 29280, Plouzané, France.
Nat Commun. 2022 Apr 8;13(1):1913. doi: 10.1038/s41467-022-29558-0.
How tectonic plates slip slowly and episodically along their boundaries, is a major, open question in earthquake science. Here, we use offshore in-situ sediment pore-pressure acquired in the proximity of the active offshore Main Marmara Fault and onshore geodetic time-series data set from a single GPS station to demonstrate the pore-pressure/deformation coupling during a 10-month slow-slip event. We show that pore pressure fluctuations are the expression of hydro-mechanical process affecting the deep seismogenic zone and indicate that small disturbances in geodetic data may have important meaning in terms of transient deformations. These results have major implications in understanding the spatial impact of slow-slip processes and their role in earthquake cycles. We demonstrate that piezometers measuring along a transform fault can help define the time scale regulating the coupling between slow-slip events and earthquake nucleation process.
构造板块如何沿着其边界缓慢且间歇性地滑动，是地震科学中一个主要的开放性问题。在此，我们利用在活跃的马尔马拉海近海断层附近获取的近海原位沉积物孔隙压力以及来自单个GPS站的陆地大地测量时间序列数据集，来证明在一次为期10个月的慢滑事件期间孔隙压力与变形的耦合。我们表明，孔隙压力波动是影响深部地震源区的水力 - 力学过程的表现，并指出大地测量数据中的小扰动在瞬态变形方面可能具有重要意义。这些结果对于理解慢滑过程的空间影响及其在地震周期中的作用具有重大意义。我们证明，沿转换断层测量的压力计有助于确定调节慢滑事件与地震成核过程之间耦合的时间尺度。
