The 2015 Illapel earthquake, central Chile: A type case for a characteristic earthquake?
The 2015 Illapel earthquake, central Chile: A type case for a characteristic earthquake?
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DOI：
10.1002/2015gl066963
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发表时间：
2016-01-28
影响因子：
5.2
通讯作者：
Dahm, T.
中科院分区：
文献类型：
--
作者：
Tilmann, F.;Zhang, Y.;Dahm, T.
2015年9月16日，M-W = 8.2的伊亚佩尔大地震破坏了智利中部边缘。结合反演的位移测量和地震波形与高频（HF）的地震波反投影，我们得到了一个全面的描述的破裂，这也预测了深海海啸波高。我们进一步确定矩张量，并获得准确的深度估计的余震序列。地震在海岸附近成核，但随后向北传播并向上倾斜，达到5-6米的峰值滑动。相反，高频地震辐射主要是在强烈滑动区下倾发射的，并且在长周期破裂之前停止，表明在最后阶段沿浅板界面沿着平滑滑动。1943年的一次表面上相似的地震，余震带相似，震源时间函数短得多，与最近一次地震的高频地震辐射持续时间相匹配，表明1943年的地震缺乏浅层滑动。
On 16 September 2015, the M-W = 8.2 Illapel megathrust earthquake ruptured the Central Chilean margin. Combining inversions of displacement measurements and seismic waveforms with high frequency (HF) teleseismic backprojection, we derive a comprehensive description of the rupture, which also predicts deep ocean tsunami wave heights. We further determine moment tensors and obtain accurate depth estimates for the aftershock sequence. The earthquake nucleated near the coast but then propagated to the north and updip, attaining a peak slip of 5-6 m. In contrast, HF seismic radiation is mostly emitted downdip of the region of intense slip and arrests earlier than the long period rupture, indicating smooth slip along the shallow plate interface in the final phase. A superficially similar earthquake in 1943 with a similar aftershock zone had a much shorter source time function, which matches the duration of HF seismic radiation in the recent event, indicating that the 1943 event lacked the shallow slip.