Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area
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摘要: 搜集了盈江及其邻区5组地震序列震源机制解并反演得到该区域的构造应力场。研究结果显示：盈江地区整体主压应力以NNE向为主，主张应力以ESE向为主；但其局部应力场不完全一致，沿苏典断裂分布的主压应力轴走向随着断裂走向由北向南延伸角度逐渐向北偏移，而盈江地区的西南部，其主压应力走向更偏向于东，这可能与大盈江断裂的横向拉伸有关。此外，本研究通过应力场反演识别出了5组地震序列震源机制解的主发震断层节面的走向、倾角、滑动角及发震断层的摩擦系数，为今后该区域的地震研究及地壳动力学变迁提供了参考。Abstract: There has always been a problem in inversion of tectonic stress field by focal mechanism solution, it is impossible to determine which nodel plane is the correct seismogenic fault plane. The joint iterative stress inversion method can effectively avoid the error caused by incorrect fault selection by identifying the fault instability. In this paper, the focal mechanism solutions of five groups of earthquake sequences in Yingjiang and its adjacent areas are collected, and the tectonic stress field in this area is inversed. The results show that, in Yingjiang area, the main compressive stress is NNE, and the main tensile stress is ESE, which is basically consistent with the previous research results. However, the local stress field is not completely consistent. The strike of the principal stress axis along the Sudian fault extends from north to south, and the angle gradually shifts to the north. In the southwest of Yingjiang, the strike of the principal stress tends to the East, which may be related to the transverse extension of the Dayingjiang fault. In addition, the strike, dip angle, slip angle and friction coefficient of the main seismogenic fault nodal planes of the focal mechanism solutions of five groups of earthquake sequences are identified by stress field inversion. This provides a valuable reference for the future seismic and crustal dynamic changes research in this region.
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图 1 盈江区域地震序列震源机制解空间分布图
F1：怒江断裂；F2：龙陵—瑞丽断裂；F3：瓦德龙断裂；F4：大盈江断裂；F5：昔马—盘龙山断裂；F6：苏典断裂；F7：槟榔断裂；F8：猴桥—中和断裂；F9：固东—腾冲断裂图中A−E区分别代表2008年3月21日、8月21日及9月3日盈江地震序列、2011年3月10日盈江地震序列和2011年8月9日腾冲地震序列的震源机制解分区
Figure 1. Spatial distribution of focal mechanism solutions of earthquake sequences in Yingjiang region
F1：Nujiang fault；F2：Longling-Ruili fault；F3：Wadelon fault；F4：Dayingjiang fault；F5：Xima-Panlongshan fault；F6：Sudian fault；F7：Binglang fault；F8：Houqiao-Zhonghe fault；F9：Gudong-Tengchong fault.A−E in the figure represent the focal mechanism solution partition of Yingjiang earthquake sequences on 21 March 2008，21 August 2008，3 September 2008，10 March 2011 and Tengchong earthquake sequence on 9August 2011，respectively
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图 2 断层不稳定性的莫尔圆定义（Vavryčuk，2014）
红色圆点标出了以不稳定性为特征I＝1的主断层上的牵引力，蓝色圆点标出了以任意不稳定性为特征I的主断层上的牵引力
Figure 2. Definition of the fault instability in Mohr’s diagram （Vavryčuk，2014）
The red solid circle marks the traction on the main fault characterized by instability I＝1，and the blue solid circle marks the traction on the main fault characterized by arbitrary instability
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图 3 A—E区（a—e）5组地震序列震源机制解联合迭代反演的应力场结果
左侧为地震序列震源机制解反演的断层摩尔圆分布，右侧为主轴方向及P，T轴
Figure 3. Stress field results of joint iterative inversion for focal mechanism solutions of five seismic sequences in areas A−E （a−e）
The left side is the fault Mohr’s circle distribution inversed by focal mechanism solutions of seismi sequences， and the right side is the main axis direction and P，T axis
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图 4 5组地震序列构造应力场反演的应力形因子R的分布（左）及主应力轴方向（右）
Figure 4. Stress shape factor R distribution （left） and principal stress axis direction （right） of tectonic stress field inversion results for five earthquake sequences
（a） 2008-13-21；（b） 2008-08-21；（c） 2008-09-03；（d） 2011-03-10；（e） 2011-08-09
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图 5 5组地震序列震源机制解应力反演识别出的主断层节面图
Ⅰ ：地震序列震源机制解的双节面下半球投影图；Ⅱ ：最优断层节面下半球投影；Ⅲ ：两组震源丛最优发震断层的主断层节面；Ⅳ ：主断层节面的P，T轴
Figure 5. Nodal map of main fault identified by stress inversion of focal mechanism solutions of five groups of earthquake sequences
Ⅰ ：Double-nodal lower hemispherical projection of focal mechanism solutions of the earthquake sequence；Ⅱ ：Lower hemispherical projection of optimal fault nodal plane；Ⅲ ：Optimal occurrence of the main fault nodal plane for the two sets of focal clusters；Ⅳ ：The P and T axis of the main fault nodal plane （a） 2008-03-21；（b） 2008-08-21；（c） 2008-09-03；（d） 2011-03-10；（e） 2011-08-09
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图 6 主压应力轴应力场分布模型图
Figure 6. Stress field distribution model diagram of principal compressive stress axis
表 1 构造应力场应力主轴反演结果
Table 1 Inversion results of stress principal axis of tectonic stress field
地震序列主震
发震日期分区 震源机制解
个数σ1 σ2 σ3 应力形因子R 方位角/° 倾角/° 方位角/° 倾角/° 方位角/° 倾角/° 2008-03-21 A区 17 44 3 258 86 135 2 0.78 2008-08-21 B区 36 215 33 40 57 306 2 0.40 2008-09-03 C区 48 34 3 212 87 304 0 0.75 2011-03-10 D区 61 193 15 333 70 99 12 0.57 2011-08-09 E区 23 195 1 294 83 105 7 0.65 
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表 2 迭代应力反演识别出的最优主断层节面
Table 2 Optimal main fault nodal plane identified by iterative stress inversion
地震序列主震
发震日期反演识别的两组主断层节面 地震序列主震
发震日期反演识别的两组主断层节面 走向/° 倾角/° 滑动角/° 走向/° 倾角/° 滑动角/° 2008-03-21 250 89 4 2011-03-10 158 88 161 199 86 −178 223 72 −7 2008-08-21 241 77 −31 2011-08-09 164 85 176 12 73 −151 225 84 3 2008-09-03 187 89 −177 60 88 −3
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