2012年意大利北部Mw >= 4.8时断层面解的稳定性
Stability of fault plane solutions for Mw >= 4.8 in northern Italy in 2012
摘要：
我们提出了一个关键的分析，在2012年影响意大利北部的主要震波迹象的矩张量解决方案。使用名为INPAR的非线性方法，在区域距离反演全波形，我们研究了周期依赖的分辨率，特别是影响的解决方案的浅部事件。这主要是由于地震张量的Mzx和Mzy分量在反演其波长显著超过震源深度的信号时分辨率较差。因此，不稳定性影响震源深度和断层面解反演，并产生虚假的大补偿线性矢量偶极分量。在截止时间短于20秒进行的反演揭示了在许多情况下不同的细节破裂过程中，没有解决在较长的截止时间反演。因此，我们得出结论，全波形的反演截止周期越短越好。
英文摘要：
We propose a critical analysis of the moment tensor solutions of the major seismic events that affected northern Italy in 2012. Inverting full waveforms at regional distance using the non-linear method named INPAR, we investigate period dependent resolution that affects in particular the solutions of shallow events. This is mainly due to the poor resolution of Mzx and Mzy components of the seismic tensor when inverting signals whose wavelengths significantly exceed the source depth. As a consequence, instability affects both source depth and fault plane solution retrieval, and spurious large Compensated Linear Vector Dipole components arise. The inversion performed at cutoff periods shorter than 20 s reveals in many cases different details of the rupture process, that are not resolved inverting at longer cutoff periods. Thus we conclude that inversion of full waveforms at cutoff period as short as possible should be preferred.
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