基于GNSS速度场估计南北地震带北段主要活动断裂现今运动速率和滑动亏损

doi:10.12196/j.issn.1000-3274.2022.04.003

摘要/Abstract

摘要： 基于“中国大陆构造环境监测网络”GNSS速度场, 使用负位错模型, 结合前人研究成果, 反演获得2015—2020年南北地震带主要活动断裂面0～40 km深度的滑动速率、滑动亏损、闭锁率等, 结合应变率场变化, 对两期滑动参数数值进行定量分析和趋势性对比。结果表明, 阿尔金北缘断裂肃北宽滩山段、贺兰山东麓断裂南段存在闭锁。庄浪河断裂存在较大范围闭锁, 永登县—兰州交界段滑动亏损达2.69 mm/a。西秦岭北缘断裂鸾凤段滑动亏损介于0～3.22 mm/a, 断裂上的闭锁部位位置分布不均, 大部分闭锁部位位于天水段、鸾凤段。东昆仑断裂除阿拉克湖—托索湖段滑动亏损速率相比2013—2015期增加了5.12 mm/a外, 其他部位相比2013—2015期有所降低, 但整体仍保持较高的滑动亏损。除托索湖和玛曲外, 其他部位的闭锁率分布均匀。秀沟—阿拉克湖段、阿拉克湖—托索湖段、托索湖—玛曲段的整体滑动速度变化较小且保持较高的滑动亏损和闭锁率。海原断裂哈思山—马厂山段存在闭锁。六盘山断裂整体滑动亏损提高到1.39～6.34 mm/a, 滑动速率有所提高, 海原段、固原—泾源交界存在闭锁, 祁连山北缘断裂玉门段和肃南段存在闭锁。应密切关注阿尔金北缘断裂肃北宽滩山段、庄浪河断裂永登县-兰州交界段、西秦岭北缘断裂天水段和鸾凤段、东昆仑断裂秀沟-阿拉克湖段、阿拉克湖-托索湖段、托索湖-玛曲段、贺兰山东麓断裂南段、海原断裂哈思山—马厂山段、六盘山断裂海原段、固原—泾源交界、祁连山北缘断裂玉门段和肃南段这些部位的大震风险。

关键词: 南北地震带, 活动断裂, 应变率场, 滑动速率, 滑动亏损, 闭锁率

Abstract: Based on the GNSS velocity field of Crustal Movement Observation Network of China (CMONOC), the negative dislocation model was used to obtain the slip rate, slip deficit and lock-in rate of 0～40 km depth of the main active faults in the North-South seismic belt from 2013 to 2015 and 2015 to 2020, combined with the change of strain rate field. Quantitative analysis and trend comparison are made on sliding parameters of the two periods. The results show that the northern altun fault, Subei Kuantan Mountain fault and the southern part of the eastern foot of Helan Mountain fault are locked. The Zhuanglanghe fault is widely locked, and the slip deficit of the Yongdeng-Lanzhou junction reaches 2.69 mm/a. The slip deficit of the fault and tragic section in the northern margin of west Qinling ranges from 0 to 3.22 mm/a, and the locked-in parts are unevenly distributed, and most of them are located in tianshui section and Luanfeng section. Except for the Arak-Tosuo Lake segment, which increases by 5.12 mm/a than that from 2013 to 2015, the slip deficit in other parts of the East Kunlun fault decreases than that from 2013 to 2015, but the overall slide loss remains high. Except for Lake Toso and Maqu, the deficit rate was evenly distributed. Xiugou-arak Lake segment, Arak Lake-Tosuo Lake segment, and Tosuo Lake-Maqu segment have small changes in overall sliding velocity and keep high sliding deficit and locking rate. There is locking in Hasishan-Machangshan section of Haiyuan fault. The overall sliding deficit of Liupanshan fault increases to 1.39～6.34 mm/a, the sliding rate increases, and there is locking at the boundary of Haiyuan segment and Guyuan-Jingyuan fault. The Yumen and Sunan faults in the northern margin of Qilian Mountains are locked. We should pay close attention to Subei Kuantan Mountain section of northern Altun fault, Yongdeng-Lanzhou junction section of Zhuanglang River fault, Tianshui and Luanfeng sections of northern Qinling fault, Xiugou-Alak Lake section, Alak Lake-Tuosuo Lake section, Tuosuo Lake-Maqu section of East Kunlun fault, southern section of Helan Mountain eastern fault, Hasishan-Machang Mountain section of Haiyuan fault, Liupanshan fault Haiyuan section and Guyuan-Jingyuan junction Yumen segment and Sunan segment of the northern margin of the Qilian Mountains. Be aware of the risk of major earthquakes in these areas.

Key words: North-South seismic belt, Active fault, Strain rate field, Slip rate, Slip deficit, Locking rate

中图分类号:

P315.7

张楠, 聂高众, 范熙伟, 王静, 余思汗, 孙嘉欣, 谢辉. 基于GNSS速度场估计南北地震带北段主要活动断裂现今运动速率和滑动亏损[J]. 地震, 2022, 42(4): 25-46.

ZHANG Nan, NIE Gao-zhong, FAN Xi-wei, WANG Jing, YU Si-han, SUN Jia-xin, XIE Hui. The Estimation of Current Motion Rates and Slip Deficits of the Main Active Faults in the Northern Segment of the North-South Seismic Belt Based on GNSS Velocity Field[J]. EARTHQUAKE, 2022, 42(4): 25-46.

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