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

各类地震活动力矩张量中的非双偶分量及其与各向异性和流体流动的关系

• 批准号: 29487672
• 负责人: Professor Dr. Marco Bohnhoff
• 金额: --
• 依托单位: Institute of Geophysics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/29487672?language=en
• 关键词: Non; Double; Couple; components; moment

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).

关于地震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且持续的争论，其相关性随着数据采集技术的最新进展而不断增加。通过改进的反演算法，现在可以以前所未有的精度确定地震源参数，并且对 NDC 分量的性质进行彻底研究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。不同类型地震的 NDC 内容及其与地震各向异性和流体流动的关系的记录 我们的研究重点是将新开发的矩张量反演算法应用于 1. 1999 年 Mw=7.4 和 Mw=7.1 伊兹米特之后的余震活动。和土耳其迪兹杰地震，2。在希腊科伦博山潜艇上监测到的与火山相关的地震活动，3。德国东南部 KTB 深钻孔的流体注入诱发地震活动和 4. 在实验室岩石变形实验中观察到的声发射（微地震） 通过此处提出的研究计划，我们试图论证 NDC 断层作用在第四次地震中的作用。此外，我们希望弥合地球物理现场研究（边界条件固定但不精确）和实验室实验（边界条件明确定义）之间的差距。