系舟山北麓断裂茶房口段蠕滑证据及深部变形机制研究

doi:10.12196/j.issn.1000-3274.2023.03.007

地震 ›› 2023, Vol. 43 ›› Issue (3): 91-101.doi: 10.12196/j.issn.1000-3274.2023.03.007

系舟山北麓断裂茶房口段蠕滑证据及深部变形机制研究

闫小兵¹, 李文巧², 由文智¹, 孙海燕³, 郝雪景¹, 李宏伟¹

1.山西省地震局, 山西太原 030002;
2.中国地震局地震预测研究所, 北京 100036;
3.襄垣县行政审批服务管理局, 山西长治 046200

收稿日期:2022-04-08 修回日期:2022-11-03 出版日期:2023-07-31 发布日期:2023-08-28
通讯作者: 李文巧, 高级工程师。 E-mail: lwq3278@163.com
作者简介:闫小兵(1978-), 山西晋城人, 高级工程师, 主要从事活动构造探测与地震安全性评价研究。
基金资助:
山西省应用基础研究计划(201901D111463); 山西太原大陆裂谷动力学野外站计划(NORSTY20-05); 忻州市区活动断层探测与地震危险性评价(XZHDC-01)

Study on Creep Evidence and Deep Deformation Mechanism of the Chafangkou Segment of the Northern Piedmont Fault of Xizhoushan

YAN Xiao-bing¹, LI Wen-qiao², YOU Wen-zhi¹, SUN Hai-yan³, HAO Xue-jing¹, LI Hong-wei¹

1. Institute of Earthquake Disasters, Shanxi Earthquake Agency, Taiyuan 030002, China;
2. Institute of Earthquake Forecasting, CEA, Beijing 100036, China;
3. Xiangyuan County Administrative Examination and Approval Service Administration, Changzhi 046200, China

Received:2022-04-08 Revised:2022-11-03 Online:2023-07-31 Published:2023-08-28

摘要/Abstract

摘要： 据史料记载, 1038年忻州、定襄一带发生71/2级地震。前人研究表明, 此次地震发震构造为系舟山北麓断裂, 震中位于定襄县董村镇茶房口一带。系舟山北麓断裂茶房口段跨系舟山北麓断裂水准测量开始于1985年, 至2021年断层两盘共错动9.09 mm, 年平均蠕滑量0.25 mm。蠕滑变形趋势显示茶房口段逐年发生蠕滑运动, 但整体蠕滑速率较低。采用X射线衍射定量分析方法得到茶房口同震断层泥的黏土含量为23%, 断层附近断层角砾岩的黏土含量为8%, 从老断层泥到断层角砾岩, 黏土矿物总含量逐渐降低。研究表明, 断层带中黏土含量多少是决定断裂是否蠕滑的关键因素。在地下5 km位置(约130 MPa)围压环境、扰动压强恒定为100 MPa条件下, 模拟系舟山北麓断裂天然断层, 开展高温高压实验研究, 结果表明: 系舟山北麓断裂天然断层在25℃、 50℃、 100℃、 150℃温度条件下, 在0.122 μm/s和1.22 μm/s的扰动速度下, 均表现为稳定蠕滑, 其结果和跨主断层水准测量、断层泥微观结构分析结果吻合。

关键词: 系舟山北麓断裂, 跨断层水准测量, X射线衍射结果分析, 高温高压实验

Abstract: According to historical records, in 1038, an M71/2 earthquake occurred in Xinzhou and Dingxiang County. Previous studies have shown that the seismogenic structure of this earthquake is the northern piedmont of Xizhoushan Fault, the epicenter of which is located near Chafangkou, Dongcun town, Dingxiang County. The leveling of the Chafangkou segment of the northern piedmont fault of Xizhoushan fault began in 1985, and the two plates of the fault moved at a total of 9.09 mm to 2021, with an average annual creep slip of 0.25 mm. The trend of creep deformation shows that there is creep movement in the segment of Chafangkou every year, but the overall creep rate is low. The content of clay in the seismic fault sumple of Chafangkou is 23% by using the method of X-ray diffraction, the clay content of fault breccia near the fault is 8%, and the total clay mineral content decreases gradually from old fault mud to fault breccia. The study shows that the clay content is the key factor to determine whether the fault is creeping or not. The natural fault of the northern piedmont of Xizhoushan fault is simulated in the confining pressure environment of 5 km underground (about 130 MPa), and high temperature and high pressure experiments were carried out at a constant disturbing pressure of 100 MPa. The results show that the natural faults in the northern piedmont of Xizhoushan fault exhibit steady creep slip at the temperature of 25℃, 50℃, 100℃ and 150℃ and the disturbing velocity of 0.122 μm/s and 1.22 μm/s。

Key words: The northern piedmont fault of Xizhoushan, Cross-fault leveling, X-ray diffraction analysis, High temperature and high pressure experiment

中图分类号:

P315.7

闫小兵, 李文巧, 由文智, 孙海燕, 郝雪景, 李宏伟. 系舟山北麓断裂茶房口段蠕滑证据及深部变形机制研究[J]. 地震, 2023, 43(3): 91-101.

YAN Xiao-bing, LI Wen-qiao, YOU Wen-zhi, SUN Hai-yan, HAO Xue-jing, LI Hong-wei. Study on Creep Evidence and Deep Deformation Mechanism of the Chafangkou Segment of the Northern Piedmont Fault of Xizhoushan[J]. EARTHQUAKE, 2023, 43(3): 91-101.

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系舟山北麓断裂茶房口段蠕滑证据及深部变形机制研究

Study on Creep Evidence and Deep Deformation Mechanism of the Chafangkou Segment of the Northern Piedmont Fault of Xizhoushan

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