Parametrization of general seismic potency and moment tensors for source inversion of seismic waveform data
Parametrization of general seismic potency and moment tensors for source inversion of seismic waveform data
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DOI：
10.1093/gji/ggt137
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发表时间：
2013-08
影响因子：
2.8
通讯作者：
Lupei Zhu;Y. Ben‐Zion
中科院分区：
文献类型：
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作者：
Lupei Zhu;Y. Ben‐Zion
利用全张量的特征向量和特征值，将一般地震威力张量分解为各向同性张量、双偶张量和补偿线性矢量偶极子。采用两个无量纲参数来量化各向同性和补偿线性矢量偶极子分量的大小。这些参数具有明确的有限范围，适用于地震波形数据的源张量的非线性反演。对一般地震矩张量进行分解和参数化，得到相应的结果。导出了各向同性介质中势张量和矩张量的不同参数之间的关系。本文还讨论了地震资料反演中不同震源分量相对大小的适当规范。
SUMMARY We decompose a general seismic potency tensor into isotropic tensor, double-couple tensor and compensated linear vector dipole using the eigenvectors and eigenvalues of the full tensor. Two dimensionless parameters are used to quantify the size of the isotropic and compensated linear vector dipole components. The parameters have well-defined finite ranges and are suited for non-linear inversions of source tensors from seismic waveform data. The decomposition and parametrization for the potency tensor are used to obtain corresponding results for a general seismic moment tensor. The relations between different parameters of the potency and moment tensors in isotropic media are derived. We also discuss appropriate specification of the relative size of different source components in inversions of seismic data.