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首页> 外文期刊>Pure and Applied Geophysics >Source Parameters of Weak Crustal Earthquakes of the Vrancea Region from Short-period Waveform Inversion
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Source Parameters of Weak Crustal Earthquakes of the Vrancea Region from Short-period Waveform Inversion

机译：短周期波形反演的瓦朗塞地区弱地壳震源参数

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摘要

High-frequency records of nine low magnitude shallow earthquakes of the Vrancea (Romania) seismic region are inverted for the seismic moment tensor (MT). An approach is suggested regarding how to obtain at least a rough estimate of the MT when the information on the structure of the crust is poor. Here simple 1-D layered models are used in the Green’s function synthesis despite the fact that the structure of the region is undoubtedly very complex. Different 1-D models were used for different source-station paths to approximate lateral variations. Record of a station located on a ray path which crosses a structure differing substantially from a 1-D model may however bias the retrieved MT essentially. Therefore, we did not collectively process all records, but subsets of stations separately. We check the consistency of the MTs resulting from these individual “bootstrap” solutions, and reject those which differ substantially, assuming that this is due to the oversimplification of the forward modeling. Thereafter, the averaged moment tensor yielded by the consistent subsets is accepted. Moreover, the distribution of the T, N and P axes from the moment tensors used for averaging provides a rough estimate of their reliability.
机译：将Vrancea（罗马尼亚）地震区的9次低度浅地震的高频记录反转为地震矩张量（MT）。提出了一种关于在地壳结构信息差时如何至少获得MT的粗略估计的方法。尽管该区域的结构无疑非常复杂，但这里的格林函数综合中仍使用了简单的一维分层模型。不同的一维模型用于不同的源站路径，以近似横向变化。然而，位于穿过与一维模型实质上不同的结构的射线路径上的站的记录可能会实质上使检索到的MT产生偏差。因此，我们不是集体处理所有记录，而是分别处理站点的子集。我们检查由这些单独的“引导程序”解决方案产生的MT的一致性，并假设那些差异很大，假设这是由于正向建模的过度简化而导致的，我们将予以拒绝。此后，由一致子集产生的平均矩张量被接受。此外，用于平均的力矩张量的T，N和P轴分布提供了对其可靠性的粗略估计。

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