Creep and slip: Seismic precursors to the Nuugaatsiaq landslide (Greenland)
Creep and slip: Seismic precursors to the Nuugaatsiaq landslide (Greenland)
复制标题
DOI：
10.1002/2017gl075039
复制
发表时间：
2017-09-16
影响因子：
5.2
通讯作者：
Poli, Piero
中科院分区：
文献类型：
--
作者：
Poli, Piero
材料破坏的前兆信号通过数值模型进行预测，并在实验室实验中或利用现场数据进行观测。这些前兆信号是地壳断层等薄弱区域滑动加速的标志。观测这些灾难性自然事件的前兆信号，如地震和山体滑坡，对于提高我们对成核过程的物理知识是必要的。此外，观测这些前兆信号可能有助于预测这些灾难性事件或减少其危害。我在这里报告格陵兰努加特西亚克滑坡的地震前兆观测。探测到的前兆的时间演化表明，滑坡发生前的几个小时内发生了一次无地震滑动事件，滑动速度呈指数增长。此外，前兆信号幅度的时间演化揭示了成核过程中断层物理的演化。
Precursory signals to material's failure are predicted by numerical models and observed in laboratory experiments or using field data. These precursory signals are a marker of slip acceleration on weak regions, such as crustal faults. Observation of these precursory signals of catastrophic natural events, such as earthquakes and landslides, is necessary for improving our knowledge about the physics of the nucleation process. Furthermore, observing such precursory signals may help to forecast these catastrophic events or reduce their hazard. I report here the observation of seismic precursors to the Nuugaatsiaq landslide in Greenland. Time evolution of the detected precursors implies that an aseismic slip event is taking place for hours before the landslide, with an exponential increase of slip velocity. Furthermore, time evolution of the precursory signals' amplitude sheds light on the evolution of the fault physics during the nucleation process.