Deep slip rates in the Anninghe fault and its surrounding regions according to repeating earthquakes
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摘要: 基于西昌流动台阵和安宁河断裂带附近固定台站2013—2019年记录的宽频带地震波形资料，利用波形互相关方法进行相似地震识别，同时对P，S震相到时进行校正。结合S−P相对到时差约束地震相对距离的方法，在安宁河断裂带及其周边地区识别得到10组重复地震。对研究区内近震事件和重复地震分别进行重定位，并根据重复地震发震时间间隔计算断裂带深部滑动速率。结果显示：汶川—茂县断裂带西南段滑动速率约为4.37—6.09 mm/a；安宁河断裂带北段滑动速率约为2.30 mm/a；木里地区滑动速率在2.03—8.46 mm/a之间。结合已有研究成果，推测汶川—茂县断裂西南段处于持续蠕滑状态，与孕震凹凸体附近的断层运动特征相符，暗示该区可能存在发生强震的风险；由重复地震和地震重定位结果推测安宁河断裂带具有北段蠕滑、南段闭锁的特征；木里地区浅部地震事件数量多于深部，且浅部滑动速率高于深部，符合水库诱发地震的特征。
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关键词:
- 重复地震 /
- 深部滑动速率 /
- 安宁河断裂 /
- 汶川—茂县断裂西南段 /
- 西昌流动台阵
Abstract: Based on broadband seismic data recorded by the Xichang Array and permanent seismic stations near the Anninghe fault from 2013 to 2019, similar earthquake clusters were identified by means of waveform correlation and the correction of P- and S-wave arrival times. By constraining interevent distances based on the difference between S- and P-wave arrival times, 10 groups of repeating earthquakes were identified in the Anninghe fault and its surrounding regions. Local events and repeating earthquakes in the studied area were relocated, and the recurrence interval of repeating earthquakes was used to estimate deep slip rates of the fault. It was found that slip rates in the southwestern section of the Wenchuan−Maoxian fault ranged from 4.37 to 6.09 mm/a. The slip rate in the northern segment of the Anninghe fault was 2.30 mm/a, and the slip rate in the Muli region ranged from 2.03 to 8.46 mm/a. It was thus inferred that the southwestern segment of the Wenchuan−Maoxian fault is continuously creeping, which is consistent with fault movements near seismogenic asperities. Therefore, a strong earthquake may occur in this area. Based on the identification of repeating earthquakes and earthquake relocation, it was concluded that the northern section of the Anninghe fault is creeping, while its southern section is locked. In the Muli region, shallow seismic events outnumber deep seismic events, and the shallow slip rate is higher than the deep slip rate, which is consistent with reservoir-induced seismicity. -
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图 1 研究区地质构造、台站和地震事件分布
F1：鲜水河断裂；F2：汶川—茂县断裂；F3：大凉山断裂；F4：安宁河断裂；F5：则木河断裂；F6：丽江—小金河断裂
Figure 1. Geologic setting，location of the stations and earthquakes
F1：Xianshuihe fault；F2：Wenchuan−Maoxian fault；F3：Daliangshan fault；F4：Anninghe fault； F5：Zemuhe fault；F6：Lijiang-Xiaojinhe fault
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图 2 地震对破裂面重叠示意图（修改自 Li et al，2011）
Figure 2. Overlap of the source ruptures （modified from Li et al，2011）
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图 3 重复地震组S09 在 XGP 台站记录的东向（a）、北向（b）和垂向（c）分量的归一化波形
直达 P 波在 0 时刻对齐，各通道图中最下方波形为该通道全部波形的叠加。用于互相关 计算的波段被标红
Figure 3. Normalized EW component （a），NS component （b） and vertical component （c） waveforms of repeating earthquake group S09 recorded in XGP permanent station
The P phases are aligned at time zero，the bottom traces in the three channels display the stacked waveforms，and the bands marked red are used to calculate cross-correlation
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图 4 重定位后的近震事件和重复地震分布以及断裂带深部滑动速率
Figure 4. Relocation of the near earthquakes and repeating earthquakes，and fault deep slip rate
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表 1 10组重复地震及其对应的深部滑动速率
Table 1 Deep slip rate computed from 10 repeating earthquake groups
地震组 发震时间（UTC） 北纬/° 东经/° 震源深度/km 事件次数 ML 滑动速率/（mm·a−1） 年-月—年-月 S01 2013-05—2014-09 29.841 9 102.413 0 14.155 3 3 1.4—1.8 4.37±0.65 S02 2013-06—2014-11 29.844 7 102.417 7 5.167 0 3 1.5—2.4 5.13±2.95 S03 2014-05—2017-11 27.906 3 101.323 0 3.333 0 3 1.8—2.8 2.03±1.54 S04 2014-05—2017-12 27.915 9 101.320 6 3.361 3 12 1.6—2.8 8.46±2.34 S05 2014-05—2017-09 27.918 9 101.316 1 7.046 3 5 1.7—2.4 3.59±1.98 S06 2014-05—2017-12 27.947 4 101.314 5 12.582 0 3 1.8—2.8 2.06±0.90 S07 2014-08—2016-11 27.926 5 101.286 5 7.150 0 3 1.7—1.8 2.34±1.42 S08 2014-10—2016-03 27.928 4 101.302 3 6.934 5 3 1.7—2.6 3.84±2.57 S09 2016-01—2018-07 30.011 9 102.446 9 8.276 2 8 1.1—2.5 6.09±1.91 S10 2017-06—2019-01 28.966 4 102.259 3 9.182 0 3 1.1—1.4 2.30±1.54 
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