Discussion on Seismic Faults and Genesis of the 2023 Baoshan MS5.2 Earthquake Sequence in Yunnan Province
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摘要: 本文基于云南地震台网地震观测报告和云南台网区域地震波形数据，结合双差定位方法、CAP方法、川滇地区高分辨率速度模型和流体扩散模型，深入分析了2023年云南保山MS5.2地震的发震断层和成因。双差重定位结果显示，云南保山MS5.2地震沿NW向呈条带状分布，震源深度主要集中在4～12 km。震源机制解反演结果表明，云南保山 MS5.2主震2个发震断层面参数为：节面Ⅰ，走向51°，倾角78°，滑动角−34°；节面Ⅱ，走向149°，倾角56.8°，滑动角-165.6°。根据流体扩散模型拟合得到水力扩散系数
$ D $ 介于0.347～1.04 m2/s之间。根据2000—2023年地震目录，证实水库蓄水在库区周边诱发了地震活动，地震多以小群形式分布在与澜沧江河床延伸方向一致的断裂带和多组断裂交汇处。综合重定位结果、震源机制解结果及附近区域的地质构造背景，推测云南保山MS5.2地震的发震构造是一条NW149°走向的走滑型断裂，小湾电站建成蓄水后，诱发了库区周边地震活动，而云南保山MS5.2地震的发生可能是长期受库水渗透而处于饱水状态的地壳卸荷触发的一次构造型水库地震。Abstract: Based on the seismic observation report of Yunnan Seismic Network and the regional seismic waveform data of Yunnan Seismic Network, combined with the double-difference location method, CAP method, high-resolution velocity model and fluid diffusion model in Sichuan-Yunnan region, this paper deeply analyzes the seismogenic faults and causes of the MS5.2 earthquake sequence in Baoshan, Yunnan, 2023. The results of double-difference relocation show that the Baoshan MS5.2 earthquake sequence is distributed in a strip along the NW direction, and the focal depth is mainly concentrated at 4～12 km. The inversion results of the focal mechanism solution show that the parameters of the two seismogenic fault planes of the 2023 Baoshan MS5.2 mainshock are : nodal plane I, strike 51°, dip 78°, and slip angle −34° ; nodal plane II, strike 149°, dip angle 56.8°, sliding angle −165.6°. According to the fluid diffusion model, the hydraulic diffusion coefficient D is between 0.347～1.04 m2/s. Relocating the earthquake catalogue since 2000 near the epicenter, it is confirmed that the reservoir impoundment induces seismic activity around the reservoir area, and the earthquakes are mostly distributed in the form of small groups at the intersection of fault zones and multiple sets of faults consistent with the extension direction of the Lancang River riverbed. Based on the results of relocation and focal mechanism solutions and the geological tectonic background of the nearby area, it is speculated that the seismogenic structure of the Baoshan MS5.2 earthquake is a NW149° strike-slip fault. After the completion of the Xiaowan Hydropower Station, the surrounding seismic activity was induced. The occurrence of the Baoshan MS5.2 earthquake may be a tectonic reservoir earthquake triggered by the long-term infiltration of the reservoir water and the unloading of the crust in a saturated state.-
Key words:
- HypoDD /
- CAP method /
- Fluid diffusion model /
- Reservoir earthquake
1)1 2https://ses-kled.cidp.edu.cn/info/1084/1467.htm -
图 1 台站、断裂和历史中强地震分布图
Figure 1. Distribution map of historical earthquakes and faults around the Baoshan MS5.2 seismic sequence relocation stations and epicenter areas in 2023
图 2 速度模型和走时曲线
(a) 用于重定位和 CAP 反演的 P 波（实线）、S 波（虚线）速度模型 (b)震相观测走时曲线
Figure 2. Velocity model and travel-time curveliu
图 5 2023年云南保山 MS5.2地震序列M-T图
Figure 5. M-T diagram of the earthquake sequence of the MS5.2 earthquakes in Baoshan in 2023
图 7 重定位后震源深度随时间的分布
Figure 7. Distribution of source depth over time after repositioning
图 8 M-T图和月频次N-T图
Figure 8. earthquake M-T and monthly frequency N-T in the reservoir area
图 11 2023年云南保山MS5.2地震序列的时空迁移过程
Figure 11. Spatiotemporal migration process of Baoshan MS5.2 earthquake series in 2023
表 1 云南地震台网给出的保山MS≥3.0地震目录
Table 1. The catalogue of earthquakes with MS≥3.0 in Baoshan area from Yunnan seismic network
编号 日期 北京时间 ϕN/(°) λE/(°) 震源深度/km 震级MS 1 2023-05-02 23:27:22 25.358 99.279 20.9 5.2 2 2023-05-02 23:38:18 25.346 99.290 17.6 4.6 3 2024-07-29 22:50:48 25.402 99.243 15.7 3.6 
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表 2 利用CAP方法反演保山MS≥3.0地震的震源机制解
Table 2. Focal mechanisms of Baoshan MS≥3.0 earthquakes inverted by using CAP method
事件编号 震级MS 震源深度/km 节面Ⅰ/(°) 节面Ⅱ/(°) 走向 倾角 滑动角 走向 倾角 滑动角 1 5.2 7.6 51 78 −34 149 56.8 −165.6 2 4.6 8.0 158 49 −162 56 76.5 −42.4 3 3.6 5.5 46 81 8 314.7 82.1 170.9
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