The relationship between multi‐scale rupture characteristics and different frequency contents of the seismic waveforms has been revealed for moderate to great earthquakes by previous researches. To better understand such a relationship, we propose a two‐step strategy to perform finite fault inversion in the wavelet domain with multi seismic datasets, involving the seismic observations at both teleseismic and near‐field distances. In our two‐step strategy, the larger‐scale pattern of the seismic rupture is first constrained by using the lower‐frequency seismic waveforms and then based on the lower‐frequency rupture pattern, the higher‐frequency rupture features are obtained by performing inversion with higher‐frequency data. We apply this two‐step strategy with multi seismic datasets to study the 30 October 2016 Mw 6.5 Norcia, Italy earthquake, which is the largest event of the 2016–2017 central Italy seismic sequence. By analyzing the recovered slip patterns from different frequency bands, we notice the frequency‐dependent rupture features of this earthquake. The lower‐frequency slip concentrated at the shallower depths above the source, and the higher‐frequency slip appeared near the edges of the lower‐frequency slip patch, working as “barriers”, due to fault complexities in central Italy. The frequency‐dependent slip pattern of the 30 October 2016 Norcia earthquake shows a relation to the unevenly distributed pore fluid pressure, as indicated by Vp/Vs tomography from previous researches. Our results suggest that fault complexities and unevenly distributed fluids contribute to the frequency‐dependent rupture of this earthquake.

中文翻译：

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由联合多尺度滑移反演推论的2016年10月30日意大利诺西瓦6.5级地震的频率相关破裂特征

先前的研究已经揭示了中至大地震的多尺度破裂特征与地震波形的不同频率含量之间的关系。为了更好地理解这种关系，我们提出了一种分步策略，在多地震数据集的小波域中执行有限断层反演，涉及远震和近场距离的地震观测。在我们的两步策略中，首先通过使用低频地震波形来约束较大规模的地震破裂模式，然后根据低频破裂模式，通过对频率进行反演获得高频破裂特征。更高频率的数据。我们将此两步策略与多个地震数据集一起应用，以研究2016年10月30日意大利诺西亚6.5级地震，这是2016-2017年意大利中部地震序列中最大的事件。通过分析从不同频带恢复的滑模，我们注意到该地震的频率依赖性破裂特征。低频滑移集中在震源上方较浅的深度，而高频滑移出现在低频滑移斑块的边缘附近，由于意大利中部的断层复杂性，它起着“屏障”的作用。正如先前研究的Vp / Vs层析成像所表明的那样，2016年10月30日诺西亚地震的频率依赖性滑动模式显示出与孔隙流体压力分布不均匀的关系。我们的结果表明，断层的复杂性和流体的不均匀分布是造成该地震频率依赖的破裂的原因。