Collaborative research: Investigating effects of geologic complexity on induced seismicity, using M0-M5.7 seismicity from Prague, Oklahoma

最近，美国中西部地区的诱发地震活动激增，其中俄克拉荷马州的地震活动率超过了加州，这引起了争议，引起了公众的注意，并影响了政策。因此，诱发地震活动已成为美国地震科学在过去几年中的焦点，但仍有很多关于诱发地震活动的机制有待了解。 在这项研究中，记录良好的2011年俄克拉荷马州布拉格地震序列将用于调查地震活动性研究中通常无法获得的规模的变形（地震定位精度约为10米）。这种定位良好的地震可以更好地了解复杂的断层是如何失败的。 此外，对来自布拉格地区的岩石进行的实验室实验将提供有关断层的强度和稳定性以及向断层中泵入流体如何可能促进地震的信息。布拉格序列包含三个Mw5级地震及其强余震序列，以及两个大地震的前震序列。精确的布拉格地震可以定位允许的故障过程被认为是在一个规模相当于断层结构的研究中测量的折返断层。此外，对布拉格地区岩性进行的补充实验室实验将有助于研究流体压力对断层强度和稳定性的影响。最终目标是使用布拉格数据集来探测流体压力和断层带复杂性对地震成核、传播和停止的影响。具体来说，这项工作将解决以下问题：1）是否布拉格附近的断层显示的地震活动，可用于预测破裂？2)复杂的断层几何形状如何控制破裂？断层强度、强度不均匀性和断层稳定性在诱发地震中起什么作用？

The recent surge in induced seismicity in the Midwestern United States, during which Oklahoma has catapulted past California in seismicity rate, has created controversy, captured the attention of the general public, and influenced policy. As a result, induced seismicity has become a focal point of earthquake science in the United States over the last few years; however, much remains to be learned about the mechanisms of induced seismicity. In this research the well-recorded 2011 Prague, OK earthquake sequence will be used to investigate deformation on a scale not commonly obtainable in seismicity studies (earthquake location with precision ~10 meters). Such well-located earthquakes allow for better understanding of how complex faults fail. Furthermore, laboratory experiments on the rocks from the Prague area will provide information on how strong and stable the faults are, and how pumping fluids into the faults might promote earthquakes.The Prague sequence contains three earthquakes ¡Ý Mw5 and their robust aftershock sequences, as well as the foreshock sequences for two large events. The precision with which the Prague earthquakes can be located allows the failure processes to be considered on a scale comparable to fault structures measured in studies of exhumed faults. In addition, complementary laboratory experiments on lithologies from the Prague area will allow study of the effects of fluid pressure on fault strength and stability. The ultimate goal is to use the Prague dataset to probe the influence of fluid pressure and fault zone complexity on earthquake nucleation, propagation, and arrest. Specifically this work will address the following questions: 1) Do the faults near Prague show precursory activity that could be used to forecast rupture? 2) How does complex fault geometry control rupture? and 3) How do fault strength, strength heterogeneity, and fault stability play a role in induced earthquakes?