山西省繁峙县义兴寨金矿地震监测及机理分析

Analysis on Monitoring and Mechanism of Earthquake at Yixinzhai Gold Mine in Fanshi County, Shanxi Province

摘要: 2016年8月15日我们在山西省繁峙县义兴寨金矿附近设立了由5个短周期数字地震仪组成的临时地震台网，记录到8.22义兴寨ML2.3级地震序列，通过使用双差定位技术和PS振幅比震源机制解法，发现该地震序列分布在义兴寨金矿采空区周边，主要集中在北西向义兴寨断层带上，震源机制解以正断型为主，多数微震发震断层方向北北东向，最大地震震源机制是走滑型，其破裂方向北西向；地震机理分析后认为条带状的采空区周边形成地下应力松弛带，在重力场作用下，引发采空区上方岩体少数冒顶，采空区两侧岩体分别沿着北北东向的节理向下、向采空区中心方向错动，产生微震活动；当采空区不断向下或两端延伸，更易借助北西向义兴寨断层向外扩大应力松弛带的范围，引发地震强度进一步增大；另外，位于采空区下部断裂因卸载也引起局部活动，出现了几次地表强烈有感地震。这些现象说明义兴寨金矿地震的增强过程反映了采空区周边重力场作用过程，也对应着沿着义兴寨断层的局部活动现象。

Abstract: On August 15, 2016 we have set up a temporary seismic network consisting of 5 short-period digital seismographs near Yixingzhai gold mine in Fanshi County of Shanxi province, recording 8.22 Yixingzhai ML2.3 earthquake sequence. By using double difference location technology and PS amplitude ratio of focal mechanism solution, it is found that the seismic sequence distributes near the goaf in Yixingzhai gold mine, mainly concentrating in the Yixingzhai fault in direction of NW. The majority of solution to the focal mechanism is normal fault type, the most microseismic seismogenic fault being direction of NNE and the maximum earthquake rupture mechanism being NW direction. Seismic analysis shows that banded goaf formed underground stress relaxation zone in the gravity field, and the gravitational field led to a few rocks above the goaf roofing, while the rocks on both sides of the goaf went down along NNE direction, and moved to the center, generating microseismic activity. When the goaf extended downward or on both ends, the range of relaxation zone will be larger in virtue of the NW Yixingzhai fault, further increasing the earthquake intensity. And the fault in the lower part of the goaf stimulated local activity due to the unloading, causing several strong earthquakes on the surface. These phenomena indicate that the enhancement of Yixingzhai seismic response reflects the gravity field action around the goaf, and also corresponds with the local activity phenomena along the Yixingzhai fault.

文章引用：马文涛, 罗佳宏, 李春政. 山西省繁峙县义兴寨金矿地震监测及机理分析[J]. 矿山工程, 2018, 6(1): 1-10. https://doi.org/10.12677/ME.2018.61001

参考文献

[1]	胡毓良. 诱发地震及其对策[J]. 中国地震, 1988, 1(4): 34-39.
[2]	杨清源, 陈献程, 马文涛, 等. 长江三峡地区盐关微地震群的成因机制[J]. 地震地质, 1993, 15(3): 247-252.
[3]	张少泉, 张诚, 修济刚, 等. 矿山地震研究书评[J]. 地球物理学进展, 1993, 8(3): 69-85.
[4]	Gibowicz, S.J., Kijko, A. 矿山地震学引论[M]. 修济刚, 徐平, 杨心平, 译, 张少泉, 校. 北京: 地震出版社, 1996: 1-415.
[5]	张兆平, 关杰, 张少泉, 等. 矿井微震与冲击地压危险评价的研究现状[J]. 中国地震, 1988, 1(2): 123-124.
[6]	潘一山, 李忠华, 张梦涛. 我国冲击地压分布、类型、机理及防治研究[J]. 岩石力学与工程学报, 2003, 22(11): 1844-1851.
[7]	李世愚, 和雪松, 张少泉, 等. 矿山地震监测技术的进展及最新成果[J]. 地球物理学进展, 2004, 19(4): 853-859.
[8]	姜福兴 , 杨淑华, 成云海, 等. 煤矿冲击地压的微地震监测研究[J]. 地球物理学报, 2006, 49(5): 1512-1516.
[9]	陆菜平, 窦林名, 王耀峰, 等. 坚硬顶板诱发煤体冲击破坏的微震效应[J]. 地球物理学报, 2010, 53(2): 450-456.
[10]	姜耀东, 赵毅鑫.我国煤矿冲击地压的研究现状: 机制、预警与控制[J]. 岩石力学与工程学报, 2015, 34(11): 2188-2204.
[11]	李成禄, 李胜荣, 罗军燕, 等. 山西繁峙义兴寨金矿黄铁矿热电系数与导型特征及其地质意义[J]. 现代地质, 2009, 23(6): 1056-1063.
[12]	Waldhauser, F. and Ellsworth, W.L. (2000) A Double-Difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California. BSSA, 90, 1353-1368. [Google Scholar] [CrossRef]
[13]	粱尚鸿, 李幼铭, 束沛镒. 利用区域地震台网P、S振幅比资料测定小震震源参数[J]. 地球物理学报, 1984, 27(3): 249-256.
[14]	Hasegawa, H.S., Wetmiller, R.J. and Gendzwill, D.J. (1989) Induced Seismicity in Mines in Canada—An Overview. Pure and Applied Geophysics, 129, 423-453. [Google Scholar] [CrossRef]
[15]	李铁, 蔡美峰, 蔡明. 采矿诱发地震三个特征震源深度的探讨[J]. 岩石力学与工程学报, 2007, 26(8): 1546-1552.
[16]	马文涛, 徐长朋, 李海鸥, 等. 长江三峡水库诱发地震加密观测及地震成因初步分析[J]. 地震地质, 2010, 32(4): 552-563.