2021年酒泉阿克塞县MS5.5地震前地电场变化分析

doi:10.12196/j.issn.1000-3274.2023.04.010

摘要/Abstract

摘要： 2021年8月26日酒泉阿克塞县发生M_S5.5地震，基于距震中500 km范围内6个地电场观测站2020—2021年的观测资料，利用大地电场岩体裂隙水（电荷）渗流（移动）模型，计算了地电场观测站优势方位角，结合震源机制以及安西站定点形变观测资料，分析获知： ① 震前山丹、高台、白水河3个观测站的优势方位角出现异常变化，异常开始时间集中在2021年5月，表现出一定的同步性；瓜州、都兰、嘉峪关3个观测站优势方位角无明显异常变化。 ② 安西站伸缩仪、垂直摆与相距约12 km的瓜州站地电场，其日均值数据在2021年4—7月出现近乎同步的趋势转变、加速、跃变等异常变化现象，显示出不同物理参数间具有关联性。应用地电场与定点形变观测数据，通过综合分析、相互印证，判断区域应力状态变化，为探索不同物理参数异常演化在数据可靠性分析、地震预测中的应用等提供了思路。

关键词: 2021年酒泉阿克塞县M_S5.5地震, 地电场, 定点形变, 震源机制

Abstract: An M_S5.5 earthquake occurred in Aksai County， Jiuquan on August 26， 2021. Based on the 2020—2021 observation data of 6 geoelectric field observation stations within a range of 500 km from the epicenter， a geoelectric field rock fissure water (charge) seepage (movement) model was used to calculate the dominant azimuth angle of the geoelectric field observation station. Combined with the focal mechanism and fixedpoint deformation observation data at Anxi station， we concluded that: ① The dominant azimuth angles showed abnormal changes at Shandan， Gaotai, Baishui River， which started in May 2021 and showed a certain degree of synchronicity. There was no significant abnormal change in the dominant azimuth angles at Guazhou， Dulan， and Jiayuguan. ② The daily average values of the Anxi Station's extensometer， vertical pendulum， comparing with Guazhou Station's geoelectric field that were approximately 12 km apart， showed nearly synchronous trend changes， acceleration， jumps， and other abnormal changes from April to July 2021， which indicated the correlation between different physical parameters. The application of geoelectric field and fixed point deformation observation data， through comprehensive analysis and mutual confirmation， we determined the changes in regional stress state， which provide ideas for exploring the application of different physical parameter anomaly evolution in data reliability analysis and earthquake prediction.

Key words: The 2021 M_S5.5 earthquake in Aksai County, Jiuquan, Geoelectric field, Fixed point deformation, Focal mechanism

中图分类号:

P315.7

辛建村, 方炜, 杨宜海, 李娜, 颜文华, 冯红武. 2021年酒泉阿克塞县M_S5.5地震前地电场变化分析[J]. 地震, 2023, 43(4): 153-168.

XIN Jian-cun, FANG Wei, YANG Yi-hai, LI Na, YAN Wen-hua, FENG Hong-wu. Analysis on Variation of Geoelectric Field before M_S5.5 Earthquake in Aksai County, Jiuquan in 2021[J]. EARTHQUAKE, 2023, 43(4): 153-168.

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