Imaging earthquake sources and earth structure based upon adjoint methods

基于伴随方法的震源和地球结构成像

• 批准号: 371685-2009
• 负责人: Liu, Qinya
• 金额: $ 1.97万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=528330
• 关键词: Imaging; earthquake; sources; earth; structure

Recent developments in 3D numerical simulations of seismic wave propagation have made it possible to improve our understanding of earthquake rupture processes and the interior structure of the earth using a full wave-equation approach. We plan to calculate the source parameters for earthquakes in southern California with updated 3-D Green's functions to further understand the tectonic processes within this region. We will automatically determine source locations and mechanisms for major global earthquakes in real time based upon simulations of seismic wave propagation in a 3D global tomography model. We also enhance our knowledge of the earth structure by forming the tomography inverse problem based upon adjoint methods and the setup of 3D numerical simulations. We will take advantage of the abundant broadband seismic data, choose the proper inversion techniques, and produce new generation tomographic images that will shed light on the geodynamical and tectonical processes deep inside the earth.

3D地震波传播的3D数值模拟中的最新发展使我们可以使用完整的波动方程方法来提高我们对地震破裂过程和地球室内结构的理解。我们计划通过更新的3-D Green功能来计算南加州地震的源参数，以进一步了解该地区内部的构造过程。我们将根据3D全球层析成像模型中的地震波传播模拟，自动确定实时全球大地震的源位置和机制。我们还通过基于伴随方法和3D数值模拟的设置形成层析成像逆问题来增强对地球结构的了解。我们将利用丰富的宽带地震数据，选择适当的反转技术，并产生新一代的层析成像图像，这些图像将阐明地球内部深处的地球动力学和构造过程。