Evaluating Centroid-Moment-Tensor Uncertainty in the New Version of ISOLA Software
Evaluating Centroid-Moment-Tensor Uncertainty in the New Version of ISOLA Software
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DOI：
10.1785/0220130002
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发表时间：
2013-07
影响因子：
3.3
通讯作者：
E. Sokos;J. Zahradník
中科院分区：
文献类型：
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作者：
E. Sokos;J. Zahradník
在线资料：其他数字。基于区域和局部波形的震源机制和矩张量确定已成为地震学的常规任务。近年来，人们一直致力于扩展软件功能，特别是在包含有限范围源和易于用户友好使用方面。这些努力的两个例子是FMNEAREG和KIWI软件包。从NEAr源到区域距离记录的震源机制（FMNEAREG; Delouis等，2008; Maercklin等，2011）基于1D（线）有限源表示和完整的弹性动力学波场进行网格搜索，以找到纯双耦合源。KIWI软件（KInematic Waveform Inversion; Cesca et al.，2010）允许自动检索点源参数，对于给定阈值以上的震级，也可以获得运动学有限断层破裂模型。KIWI依赖于预先计算的绿色功能数据库。KIWI分两步进行矩张量反演，第一步是基于振幅谱的拟合。第二步是基于时域波形拟合。ISOLA，ISOLAated Asperities，软件包（Sokos和Zahradnik，2008）也执行波形反演以找到震源参数。ISOLA基于FORTRAN代码，并提供用户友好的MATLAB图形界面（GUI; www.mathworks.com/products/MATLAB）。ISOLA允许对完整的区域和局部波形进行单点源和多点源迭代反褶积（菊池和Kanamori，1991）反演。矩张量通过最小二乘反演得到，而点源的位置和起源时间则通过网格搜索得到。计算选项包括反演以检索完整的矩张量（MT）、偏MT和纯双力偶MT。有限范围震源反演也可以通过预先规定双耦合机制（其将在断层面上保持均匀）来执行。绿色函数，包括近场项，使用离散波数方法计算（Bouchon，.
Online Material: Additional figures. Focal mechanism and moment tensor determinations based on regional and local waveforms have become routine tasks in seismology. In recent years, considerable effort has been dedicated to extend software capabilities, in particular towards the inclusion of finite‐extent sources and easy, user‐friendly use. Two examples of these efforts are the FMNEAREG and KIWI software packages. Focal Mechanism from NEAr source to REGional distance records (FMNEAREG; Delouis et al. , 2008; Maercklin et al. , 2011) performs a grid search in order to find pure double‐couple sources, based on a 1D (line) finite‐source representation and complete elastodynamic wave field. The KIWI software (KInematic Waveform Inversion; Cesca et al. , 2010) allows the automatic retrieval of point‐source parameters, and for magnitudes above a given threshold kinematic finite‐fault rupture models can also be obtained. KIWI relies on a pre‐calculated database of Green’s functions. KIWI performs the moment tensor inversion in two steps, the first of which is based on the fit of amplitude spectra. The second step is based on time‐domain waveform fits. The ISOLA, ISOLated Asperities, software package (Sokos and Zahradnik, 2008) also performs waveform inversions to find source parameters. ISOLA is based on FORTRAN codes and offers a user‐friendly MATLAB graphical interface (GUI; www.mathworks.com/products/MATLAB). ISOLA allows for both single‐ and multiple‐point‐source iterative deconvolution (Kikuchi and Kanamori, 1991) inversion of complete regional and local waveforms. The moment tensor is retrieved through a least squares inversion, whereas the position and origin time of the point sources are grid searched. The computation options include inversion to retrieve the full moment tensor (MT), deviatoric MT, and pure double‐couple MT. Finite‐extent source inversions may also be performed by prescribing a priori the double‐couple mechanism (which will remain homogeneous over the fault plane). Green’s functions, including near‐field terms, are calculated using the discrete wavenumber method (Bouchon, …