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为确定活动破裂面的位置和重建推断的破裂区的几何形态,对地震序列的空间构成进行了探讨。我们研制出一种新方法——正则化最佳各向异性小波系数(NOAWC)法,可以根据一组震源得到活动破裂面。我们的方法允许在不考虑断裂面的尺度、位置、形态各向异性以及取向的情况下确定断裂面内的构成结构。该方法包括3个垂直截面系统的确定、震源投影影响的最小化以及从本质上解释地震事件定位的误差。用合成和实际两种数据验证了NOAWC方法的精度和有效性。将该方法应用于阿吕迪(法国比利牛斯)M=5.1余震序列,显示了如何把数学上可能重构的几何形状与可利用的断层面解及地貌标志结合起来确定活动破裂面,并提出和实际验证了局部构造模型。这个新的多手段方法适合于大数据库的定量计算和计算机辅助分析。
In order to determine the location of the active fracture surface and reconstruct the geometry of the rupture zone, the spatial structure of the earthquake sequence is discussed. We developed a new method, the Regularized Optimal Anisotropic Wavelet Coefficient (NOAWC) method, to obtain active rupture planes from a set of sources. Our method allows the determination of the composition of the fracture surface without regard to the dimensions, location, morphological anisotropy and orientation of the fracture surface. The method includes the determination of three vertical cross-section systems, the minimization of the impact of source projection, and the interpretation of the errors in the location of seismic events. The accuracy and validity of the NOAWC method are verified by both synthetic and practical data. Applying this method to the Arduic (French Pyrenees) M = 5.1 aftershock sequence shows how to combine the geometrically possible reconstruction geometry with available tomographic solutions and topographic features to determine the active fracture surface, And put forward and verified the local structure model. This new multi-method approach is suitable for quantitative and computer-aided analysis of large databases.