Slip distribution of the 2015 Lefkada earthquake and its implications for fault segmentation
Slip distribution of the 2015 Lefkada earthquake and its implications for fault segmentation
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DOI：
10.1093/gji/ggx171
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发表时间：
2017-07-01
影响因子：
2.8
通讯作者：
Rietbrock, Andreas
中科院分区：
文献类型：
--
作者：
Bie, Lidong;Gonzalez, Pablo J.;Rietbrock, Andreas
断层分段限制了地震破裂的传播，从而限制了地震的规模，这一点已被广泛接受。虽然大陆走滑断层的沿走向分段被很好地观察到，但离岸走滑断层分段的直接证据很少。多震破裂行为的比较有助于揭示断层分段的特征。在这项工作中，我们研究了2015年莱夫卡达地震，该地震破坏了希腊莱夫卡达岛近海的一个主要活动走滑断层。本文报道了以莱夫卡达岛为研究对象的干涉合成孔径雷达（InSAR）观测结果，并推导了同震分布滑动模型。为了研究断层位置如何影响我们的干涉合成孔径雷达观测的基础上推断的位移，我们进行了一系列的反演，采取各种故障的位置从不同的研究作为一个先验。这些测试反演的结果表明，莱夫卡达断层迹线位于莱夫卡达岛近海。我们的首选模型显示，2015年地震的主滑动斑块仅限于浅层（
It is widely accepted that fault segmentation limits earthquake rupture propagations and therefore earthquake size. While along-strike segmentation of continental strike-slip faults is well observed, direct evidence for segmentation of off-shore strike-slip faults is rare. A comparison of rupture behaviours in multiple earthquakes might help reveal the characteristics of fault segmentation. In this work, we study the 2015 Lefkada earthquake, which ruptured a major active strike slip fault offshore Lefkada Island, Greece. We report ground deformation mainly on the Lefkada Island measured by interferometric synthetic radar (InSAR), and infer a coseismic distributed slip model. To investigate how the fault location affects the inferred displacement based on our InSAR observations, we conduct a suite of inversions by taking various fault location from different studies as a prior. The result of these test inversions suggests that the Lefkada fault trace is located just offshore Lefkada Island. Our preferred model shows that the 2015 earthquake main slip patches are confined to shallow depth (