Inversion von Momententensoren in anisotropen Medien mit Anwendung auf Schwarmereignisse in der Vogtland Region

各向异性介质中矩张量的反演及其在 Vogtland 地区群体事件中的应用

• 批准号: 5377111
• 负责人: Professor Dr. Frank Krüger
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5377111?language=en
• 关键词: Inversion; von; Momententensoren; anisotropen; Medien

Current moment-tensor inversion schemes are based on the assumption that the medium within which the source is located is isotropic. However, loval phases recorded from earthquakes in the Vogtland region show significant shear-wave-splitting, thus clearly indicating anisotropy in the source region. Using results of full-wave forward modeling for anisotropic media, we will investigate effects of anisotropy for the determination of kinematic and dynamic source parameters (such as fracture surface and stress drop). We will further implement an anisotropic moment-tensor inversion scheme using full-wave anisotropic Green's functions and/or a high-frequency approximation. The inversion scheme will be applied to the data from the earthquake swarm of the year 2000 in the Vogtland region. The results will put constraints on the possible role of fluids in the occurence of the observed earthquake swarm.

目前的矩张量反演方案是基于假设源所在的介质是各向同性的。然而，Vogtland地区地震记录的局域相显示出明显的剪切波分裂，从而清楚地表明震源地区的各向异性。利用各向异性介质的全波正演模拟结果，我们将研究各向异性对确定运动学和动态源参数（如裂缝面和应力降）的影响。我们将进一步使用全波各向异性格林函数和/或高频近似实现各向异性矩张量反演方案。该反演方案将应用于Vogtland地区2000年地震群数据。这些结果将限制流体在观测到的地震群发生中的可能作用。