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首页> 外文期刊>Pure and Applied Geophysics >Complex Rupture of the 2014 M-s 6.6 Jinggu Earthquake Sequence in Yunnan Province Inferred from Double-Difference Relocation
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Complex Rupture of the 2014 M-s 6.6 Jinggu Earthquake Sequence in Yunnan Province Inferred from Double-Difference Relocation

机译：2014 M-S 6.6云南泾谷地震序列的复杂破裂推断出双重差分重定位

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To study the seismogenic structure of the 7 October 2014 M-s 6.6 Jinggu earthquake, we use the cut-and-paste (CAP) method to obtain the focal mechanisms and depths of the mainshock and the two largest aftershocks with M-s5. Then, we take advantage of waveform cross-correlations to obtain precise time difference data and apply the double-difference method to relocate the aftershocks between October 7 and December 31. We relocate 2076 earthquakes (approximately 73.6% of the total) with an average horizontal accuracy of approximately 150m and a depth uncertainty of approximately 700m. The M-s 6.6 mainshock epicenter originated at 23.378 degrees N, 100.475 degrees E at a depth of 15.38km. The Jinggu earthquake sequence exhibited a linearly concentrated distribution in the northwest-southeast direction with obvious segmentation features and, thus, it can be divided into four branches spatially and two stages temporally. The aftershocks first appeared around the M-s 6.6 mainshock and then extended on either side of the mainshock along the NW-SE direction (the NW branch). The earthquake rupture direction experienced a slight clockwise deflection at the NW end and rotated clockwise by approximately 90 degrees toward the SW (the NE branch) at the SE end. Then, the rupture propagated a short distance along the SW direction and rotated counterclockwise by approximately 90 degrees into an SSE direction (the NNW branch). There is a small angle between the NW and NNW branches. The depths of the whole sequence with vertical dip angles were shallower toward the NW and deeper with two seismogenic layers toward the SE. According to the distributions of the earthquakes and nearby fractures, it is highly possible that the Jinggu earthquake sequence occurred along a hidden fracture section of the Wuliangshan fault in the NW direction. Moreover, we can confirm that the three large earthquakes all occurred along right-lateral strike-slip faults.
机译：为研究2014年10月7日M-S 6.6景国地震的发震结构，我们使用切割粘贴（CAP）方法来获得主屏幕的焦点机制和深度，并具有M-S＆GT的两个最大的余震。5。然后，我们利用波形交叉相关来获得精确的时间差数据，并应用双差分方法将10月7日和12月31之间重新定位余震。我们将2076个地震（总计73.6％的总数）汇编平均水平精度约为150米，深度不确定度约为700米。 M-S 6.6主轴震中在深度为15.38km的深度为23.378度N，100.475摄氏度。京谷地震序列在西北 - 东南方向上具有明显的分割特征，并且因此可以在空间上分为四个分支，并在时间上分为两个分支。余震首先出现在M-S 6.6主轴周围，然后沿着NW-SE方向（NW分支）在主轴的两侧延伸。地震破裂方向在NW端部处经历了稍微顺时针偏转，并在SE端朝向SW（NE分支）顺时针旋转大约90度。然后，该破裂沿SW方向传播短距离，并逆时针旋转大约90度到SSE方向（NNW分支）。 NW和NNW分支之间存在小角度。具有垂直浸角的整个序列的深度朝向NW和深度朝向SE的垂直层较深。根据地震和附近的骨折的分布，很可能是荆谷地震序列沿着NW方向上的乌兰山故障的隐藏断裂部分发生。此外，我们可以确认三个大地震都发生在右侧防滑断层。

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