青藏高原东北缘现今块体应变率与活动断裂滑动亏损  

Characteristics of Current Block Strain Rate and Active Fault SlipDeficit in the Northeastern Margin of Tibetan Plateau

作　　者：张楠[1] 王静[1] 余思涵 孙嘉欣 谢晓峰[1] ZHANG Nan;WANG Jing;YU Sihan;SUN Jiaxin;XIE Xiaofeng(Earthquake Agency of Ningxia Hui Autonomous Region,Yinchuan 750001,China)

机构地区：[1]宁夏回族自治区地震局,银川市750001

出　　处：《大地测量与地球动力学》2023年第7期661-668,共8页Journal of Geodesy and Geodynamics

基　　金：宁夏回族自治区自然科学基金(2021AAC03480)。

摘　　要：基于中国地震局“陆态网络”获得的青藏高原东北缘应变率场、滑动亏损等结果,陇中盆地构造区北部的主张应变、剪应变,祁连块体中部和柴达木块体西部的主压应变、剪应变,羌塘块体东部的主张应变、剪应变均达到1998年以来的高值。西秦岭北缘断裂闭锁部位分布不均。除阿拉克湖-托索湖段外,东昆仑断裂其他部位滑动亏损降低,但整体较高;除托索湖段和玛曲段外,其他部位闭锁率分布均匀;秀沟-玛曲段维持较高的滑动亏损。六盘山断裂滑动亏损和滑动速率升高。东昆仑断裂秀沟-玛曲段、六盘山断裂固原-泾源段、海原断裂哈思山-马厂山段、阿尔金北缘断裂肃北宽滩山段、祁连山北缘断裂玉门和肃南段、西秦岭北缘断裂天水段与鸾凤段可能存在闭锁。Based on the results of strain rate field and slip deficit in the northeastern margin of Tibetan plateau obtained from the crustal movement observation network of China,the principal tensile strain and shear strain in the northern part of Longzhong basin tectonic area,the principal compressive strain and shear strain in the central Qilian block and western Qaidam block,and the principal tensile strain and shear strain in the eastern Qiangtang block,have reached their highest values since 1998.The blocking part of the northern margin of western Qinling fault is unevenly distributed.Except for the Alakehu-Tuosuohu section,the slip deficit of other parts of the eastern Kunlun fault is reduced,but are higher as a whole.Excluding the Tuosuohu and Maqu sections,the blocking rate of other parts is evenly distributed.The Xiugou-Maqu section maintained a high slip deficit.The slip deficit and slip rate of Liupanshan fault increase.The Xiugou-Maqu section of eastern Kunlun fault,Guyuan-Jingyuan section of Liupanshan fault,Hasishan-Machangshan section of Haiyuan fault,Subei Kuantanshan section of the northern margin of Altun fault,Yumen and Sunan sections of the northern margin of Qilian fault,Tianshui and Luanfeng sections of the northern margin of western Qinling fault may be blocked.

关 键 词：青藏高原 活动断裂 滑动亏损 滑动速率 GNSS 

分 类 号：P315[天文地球—地震学]