Non-Double-Couple components in moment tensors of various types of seismicity and their relation to anisotropy and fluid flow

关于地震矩张量中非双力偶（NDC）分量的存在、起源和物理解释的讨论是一个长期存在的争论，并且越来越有意义。由于最近取得的进展，在数据采集技术，以及通过改进的反演算法，它现在可以确定震源参数与前所未有的精度和深入研究的性质的NDC组件是一个现实的研究目标。在这里，我们建议系统地分析最近获得的最先进的地震记录的不同类型的地震方面的NDC内容及其与地震各向异性和流体流动的关系。我们的研究重点是应用新开发的矩张量反演算法，以1。1999年土耳其伊兹米特和杜兹采2级地震后的余震活动。火山有关的地震活动监测在海底山。希腊科隆博，3分.德国东南部KTB深井和4.在实验室岩石变形实验中观察到的声发射（微震）。在这里提出的研究计划，我们试图争论的作用，NDC断层在四种不同类型的地震。此外，我们希望弥合地球物理场研究（边界条件固定但不精确）和实验室实验（边界条件明确）之间的差距。

The discussion on the existence, origin and physical interpretation of Non-Double-Couple (NDC) components in the seismic moment tensor of earthquakes is a long-standing and ongoing debate with increasing relevance. Due to recent progress achieved in data-acquisition technology as well as by improved inversion algorithms it is now possible to determine earthquake-source parameters with unprecedented precision and a thorough study of the nature of NDC components is a realistic research target. Here, we propose to systematically analyse recently acquired state of the art seismic recordings of different types of earthquakes with regard to NDC contents and their relation to seismic anisotropy and fluid flow. Our study focuses on the application of newly developed moment tensor inversion algorithms to 1. Aftershock activity following the 1999 Mw=7.4 and Mw=7.1 Izmit and Düzce, Turkey, earthquakes, 2. Volcano-related seismicity monitored at the submarine Mt. Kolumbo, Greece, 3. Fluid-injection induced seismicity at the KTB deep borehole, SE Germany and 4. Acoustic Emissions (microearthquakes) observed during rock-deformation experiments in the laboratory. With the here proposed research programme we attempt to argue on the role of NDC faulting in the four different types of earthquakes. Furthermore, we wish to bridge the gap between geophysical field studies (where boundary conditions are fixed but not known precisely) and laboratory experiments (where boundary conditions are well defined).