The strength of faults derived from 3-D fault imaging and tectonic computer simulations of the lithosphere

从 3D 断层成像和岩石圈构造计算机模拟得出的断层强度

• 批准号: 30265520
• 负责人: Privatdozentin Dr. Sara Carena
• 金额: --
• 依托单位: Sektion Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30265520?language=en
• 关键词: strength; faults; derived; fault; imaging

The strength of faults in the Earth s crust and lithosphere is one of the most important parameters to assess earthquake hazard and risk. Yet, to date a fundamental understanding of fault strength has remained elusive, as numerous observations have pointed to faults being much weaker than predicted by basic theory. The proposed project will advance our understanding of fault strength. The basic hypothesis is that geometry and interaction among faults govern their strength. To test this hypothesis the project will focus on well-instrumented, tectonically active regions in California and Taiwan characterized by strike slip and by thrust motion, respectively. For parts of these regions threedimensional (3-D) fault maps of unprecedented detail are already available. For other parts these will have to be constructed. I will integrate constraints from seismology, tectonics, and computer modeling, and implement the 3-D fault maps into state-of-the-art tectonic computer simulations of the deformation behavior of the Earth s crust and lithosphere. The simulations will be validated against tectonic and geodetic measurements of crustal deformation to constrain fault strength parameters. In addition to answering the fundamental question of how large fault systems interact, the expected results wilt help improve considerably the realism of earthquake scenario calculations.

地壳和岩石圈断裂的强度是评价地震危险性的重要参数之一。然而，迄今为止，对断层强度的基本理解仍然难以捉摸，因为许多观察都指出断层比基础理论预测的要弱得多。该项目将促进我们对断层强度的理解。基本假设是断层的几何形状和相互作用决定了它们的强度。为了验证这一假设，该项目将集中在加州和台湾的仪器齐全，构造活动区的特点是走滑和逆冲运动，分别。对于这些地区的部分地区，三维断层图的空前详细已经可用。对于其他部分，这些将不得不建造。我将整合来自地震学、构造学和计算机建模的约束，并将三维断层图应用于地壳和岩石圈变形行为的最先进的构造计算机模拟中。将对照地壳变形的构造和大地测量数据验证模拟结果，以限制断层强度参数。除了回答大型断层系统如何相互作用的基本问题外，预期的结果将有助于大大提高地震情景计算的真实性。

项目成果

Crust–mantle boundaries in the Taiwan–Luzon arc-continent collision system determined from local earthquake tomography and 1D models: Implications for the mode of subduction polarity reversal

• DOI: 10.1016/j.tecto.2011.12.029
• 发表时间: 2012-11
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: K. Ustaszewski;Yih‐Min Wu;J. Suppe;Hsin‐Hua Huang;Chien‐Hsin Chang;S. Carena