Relocation of three Yutian MS≥5.0 earthquake sequences during 2011—2014 and their seismogenic structures
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摘要: 基于新疆区域数字地震台网震相观测报告，采用双差定位方法对2011—2014年阿尔金断裂带西南端NE向张性剪切段附近的3次于田MS≥5.0地震序列进行了重定位，并对其余震分布及发震构造等进行了分析． 结果表明： 2011年于田MS5.5地震的发震构造为阿尔金断裂，该地震同时触发了阿尔金山前普鲁断裂的中小震活动，地震序列呈近NS向长条带状分布； 2012年于田MS6.2地震序列沿NNE向分布，发震构造为苦牙克断裂； 2014年于田MS7.3地震序列沿NE和NNE方向展布，其中NE走向的余震序列沿阿尔金断裂走向有3处余震丛集分布，由此推测该余震低活动区是由于断层内存在一较大凹凸体，终止了破裂的传播所致，发震构造为阿什库勒断裂和苦牙克断裂． 此外，地震序列截面特征显示，2011—2014年3次于田MS≥5.0地震序列基本贯通了阿尔金断裂带西南端的次级断裂和普鲁断裂．Abstract: Based on the phase observation reports of Xinjiang regional digital seismic network， this paper relocated the three Yutian MS≥5.0 earthquake sequences in the southwestern segment of the Altyn Tagh fault during 2011—2014 by using the double-difference location algorithm， and then analyzed the distribution of aftershocks and seismogenic structure of the sequences. The results show that the seismogenic structure of the Yutian MS5.5 earthquake in 2011 is the Altyn Tagh fault， meanwhile small earthquakes were triggered in Pulu fault， and the earthquake sequence is distributed in nearly NS direction．The Yutian MS6.2 earthquake sequence in 2012 is distributed mainly along the NNE direction， and its seismogenic structure is the Kuyake fault. The Yutian MS7.3 earthquake sequence in 2014 is distributed in NE and NNE direction. Along the Altyn Tagh fault exist three aftershocks clusters， suggesting that the relocated small earthquakes may be a larger asperity to terminate the spread of the rupture， and its seismogenic structure is Ashikule fault and the Kuyake fault. In addition， characteristics of section of the Yutian sequences indicate that the secondary faults at the southwestern segment of the Altyn Tagh fault and the Pulu fault were ruptured by the three Yutian MS≥5.0 earthquake sequences during 2011-2014．
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图 1 阿尔金断裂带西南端主要活动断裂(引自邓起东等，2007；吴传勇等，2014)和地震分布
F1：阿尔金断裂；F2：康西瓦断裂；F3：普鲁断裂；F4：阿什库勒断裂；F5：苦牙克断裂，下同
Figure 1. Distribution of main active faults(from Deng et al，2002；Wu et al，2014)and earthquakes in the southwestern end of the Altyn Tagh fault zone
F1：Altyn Tagh fault；F2：Karakax fault；F3：Pulu fault；F4：Ashikule fault；F5：Kuyake fault，the same below
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图 2 重定位台站(a)和和田台阵(b)分布图
Figure 2. Locations of relocation stations(a)and Hotan seismic array(b)
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图 4 本文所采用的P波速度结构模型(李秋生等，2000)
Figure 4. P-wave velocity structure model used in this paper(from Li et al，2001)
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图 5 2011—2014年3次于田MS≥5.0地震序列重定位前的地震震中分布图
蓝色圆圈为2011年于田MS5.5地震序列；绿色圆圈为2012年于田MS6.2地震序列(主震震中采用中国地震台网中心，2012)；红色圆圈为2014年于田MS7.3地震序列；黄色圆圈为2014年于田MS7.3前震序列，下同
Figure 5. Epicentral distribution of three Yutian MS≥5.0 earthquake sequences before relocation during 2011-2014
Blue circles indicate Yutian MS5.5 earthquake sequence in 2011，green circles indicate Yutian MS6.2 earthquake sequence in 2012(the epicenter of the main shock from China Earthquake Networks Center，2012)，red circles indicate Yutian MS7.3 earthquake sequence in 2014，and yellow circles indicate foreshock sequence of the Yutian MS7.3 earthquake in 2014，the same below
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图 6 2011—2012年于田MS≥3.0地震序列重定位后的地震震中分布图
Figure 6. Epicentral distribution of Yutian MS≥3.0 earthquake sequences after relocation during 2011-2012
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图 7 2011—2014年3次于田MS≥5.0地震序列重定位后的地震震中分布图
Figure 7. Epicentral distribution of three Yutian MS≥5.0 earthquake sequences after relocation during 2011-2014
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图 8 沿AA′剖面MS≥1.0地震震源深度分布图
Figure 8. Distribution of focal depth of the MS≥1.0 earthquakes along the profile AA′
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图 9 沿BB′(a)和CC′(b)剖面MS≥3.0地震震源深度分布图
Figure 9. Distribution of focal depth of the MS≥3.0 earthquakes along the profiles BB′(a)and CC′(b)
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图 10 2011—2014年3次于田MS≥5.0 地震序列震源深度分布柱状图
Figure 10. Histogram of focal depths for the three MS≥5.0 earthquake sequences during 2011-2014
表 1 2011—2014年3次于田MS≥5.0地震震源机制解
Table 1 Focal mechanism solutions of three Yutian MS≥5.0 earthquakes during 2011-2014
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