Source rupture process of the 2016 Kaikoura, New Zealand earthquake estimated from the kinematic waveform inversion of strong-motion data
Source rupture process of the 2016 Kaikoura, New Zealand earthquake estimated from the kinematic waveform inversion of strong-motion data
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根据强震数据运动波形反演估算2016年新西兰凯库拉地震震源破裂过程
DOI：
10.1093/gji/ggx505
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发表时间：
2018-03
影响因子：
2.8
通讯作者：
Xiangwei Yu
中科院分区：
文献类型：
--
作者：
Ao Zheng;Mingfeng Wang;Xiangwei Yu
2016年11月13日，新西兰南岛东北部凯库拉附近发生里氏7.8级地震。地震对当地自然和社会造成了严重的破坏和影响。结合构造环境和确定的活动断裂，野外调查和大地测量资料表明，这次地震至少有12条断裂发生破裂，震源机制是历史上最复杂的地震之一。由于震源破裂的复杂性，我们提出了一个多段断层模型的基础上的地表破裂和活动构造的分布。利用21个台站的强震资料（0.05- 0.35Hz），采用多段断层模型，用运动学波形反演方法反演了这次地震的震源破裂过程。反演结果表明，该破裂起始于Humps断层附近的震中区，然后沿沿着多条断层向北东方向扩展，直至Needles断层的离岸位置。Mw7.8地震为右旋走滑和逆走滑的混合型地震，最大滑动量约为19 m。合成波形很好地再现了观测波形的特征。此外，我们合成的同震偏移距分布的破裂区的断层模型中的上部子断层的滑动，这是大致一致的，在现场调查中观察到的地表破裂。
On 2016 November 13, anMw7.8 earthquake occurred in the northeast of the South Island of New Zealand near Kaikoura. The earthquake caused severe damages and great impacts on local nature and society. Referring to the tectonic environment and defined active faults, the field investigation and geodetic evidence reveal that at least 12 fault sections ruptured in the earthquake, and the focal mechanism is one of the most complicated in historical earthquakes. On account of the complexity of the source rupture, we propose a multisegment fault model based on the distribution of surface ruptures and active tectonics. We derive the source rupture process of the earthquake using the kinematic waveform inversion method with the multisegment fault model from strong-motion data of 21 stations (0.05–0.35 Hz). The inversion result suggests the rupture initiates in the epicentral area near the Humps fault, and then propagates northeastward along several faults, until the offshore Needles fault. TheMw7.8 event is a mixture of right-lateral strike and reverse slip, and the maximum slip is approximately 19 m. The synthetic waveforms reproduce the characteristics of the observed ones well. In addition, we synthesize the coseismic offsets distribution of the ruptured region from the slips of upper subfaults in the fault model, which is roughly consistent with the surface breaks observed in the field survey.
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影响因子：
3
作者：
K. Asano;T. Iwata;K. Irikura
通讯作者：
K. Asano;T. Iwata;K. Irikura
影响因子：
3
作者：
H. Sekiguchi;K. Irikura;T. Iwata
通讯作者：
H. Sekiguchi;K. Irikura;T. Iwata
影响因子：
2.8
作者：
H. Sekiguchi;K. Irikura;T. Iwata
通讯作者：
H. Sekiguchi;K. Irikura;T. Iwata
影响因子：
2.3
作者：
S. Yoshida
通讯作者：
S. Yoshida
影响因子：
3.3
作者：
L. Krieger;S. Heimann
通讯作者：
L. Krieger;S. Heimann