Inversion for seismic moment tensors combining translational and rotational ground motions
Inversion for seismic moment tensors combining translational and rotational ground motions
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DOI：
10.1093/gji/ggw298
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发表时间：
2016-10-01
影响因子：
2.8
通讯作者：
Igel, H.
中科院分区：
文献类型：
--
作者：
Donner, S.;Bernauer, M.;Igel, H.
我们评估了额外旋转地面运动的潜力，以提高波形反演过程中完整地震矩张量及其质心深度的分辨率。为此，我们建立了一个浅层中型走滑源的测试用例。在基于理论台站分布和基于实际台站分布的两种情况下，我们比较了仅基于平动地面运动数据反演和同时基于平动地面运动和旋转地面运动数据反演的结果。利用贝叶斯方法进行反演，克服了确定性方法的缺点，并提供了不确定性的全面量化。我们的结果表明，加入旋转地面运动数据可以大大提高矩张量的分辨率。特别是通常存在问题的分量Mxz和Myz以及所有包含深度空间导数的分量受益最大。同时，质心深度的分辨率也大大提高。
We assess the potential of additional rotational ground motions to increase the resolution of the full seismic moment tensor and its centroid depth during waveform inversion. For this purpose, we set up a test case of a shallow, medium-sized strike-slip source. In two scenarios, one based on theoretical station distribution and the other based on real station distribution, we compare the results based on inversion of translational ground motion data only and based on both, translational and rotational ground motion data. The inversion is done with a Bayesian approach to overcome the drawbacks of deterministic approaches and provide a comprehensive quantification of uncertainties. Our results indicate that the resolution of the moment tensor can be increased drastically by incorporating rotational ground motion data. Especially, the usually problematic components Mxz and Myz as well as all components containing spatial derivatives with depth benefit most. Also, the resolution of the centroid depth is much better.