Imaging earthquake sources and earth structure based upon adjoint methods

地震波传播的三维数值模拟的最新进展使我们能够使用全波动方程方法来更好地理解地震破裂过程和地球内部结构。我们计划用更新的3-D格林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，实时自动确定全球主要地震的震源位置和机制。我们还通过建立基于伴随方法的层析成像反问题和建立三维数值模拟来增强我们对地球结构的了解。我们将利用丰富的宽带地震数据，选择合适的反演技术，产生新一代层析图像，揭示地球深处的地球动力学和构造过程。

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.