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: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=483691
• 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.

地震波传播的三维数值模拟的最新发展，使我们有可能提高我们的理解地震破裂过程和地球的内部结构，使用全波动方程的方法。我们计划用更新的三维绿色函数计算加州南部地震的震源参数，以进一步了解该地区的构造过程。我们将根据三维全球层析成像模型中的地震波传播模拟，在真实的时间内自动确定全球大地震的震源位置和机制。我们还通过形成基于伴随方法的层析成像逆问题和三维数值模拟的设置来增强我们对地球结构的认识。我们将利用丰富的宽带地震数据，选择合适的反演技术，并产生新一代的层析成像图像，将揭示地球内部的地球动力学和构造过程。