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2014年2月12日于田7.3级大震对青藏东北缘地震活动的影响分析
王双绪, 蒋锋云, 张四新, 周 聪
中国地震局第二监测中心,西安 710054
摘要:
首先,利用“中国地壳运动观测网络”和“中国构造环境观测网络”截至2013年的GPS区域站观测资料,结合地质构造,简要分析了2014年2月12日新疆于田7.3级地震前大区域地壳水平运动变形背景;接着,对青藏块体东北缘地区GPS和精密水准两种不同类型资料反映的地壳运动变形与应变积累状态进行了对比分析研究;最后,结合地震活动动力环境,研究和探讨了于田7.3级地震的发生对青藏块体东北缘地震活动的可能影响。我们认为,此次于田7.3级地震发生在近年来中国西部边邻强构造活动环境和内陆地壳强烈差异运动显著的背景下,同时也是青藏块体及其边缘构造应力场较强的时段;于田7.3级地震左旋走滑错动和应力传递,可能会加速青藏块体东北缘具有高应变积累的构造断裂部位(尤其是祁连山构造带、西秦岭以南的甘青川交界)破裂释放。
关键词:  地震活动  于田7.3级地震  地壳运动变形  应变积累  青藏块体东北缘
DOI:
分类号:
基金项目:
Effects of the February 12,2014 MS 7. 3 Yutian Earthquake on Seismicity of the Northeastern Edge of Qinghai-Tibetan Block1
Wang Shuangxu,Jiang Fengyun,Zhang Sixin,and Zhou Cong
Second Crust Monitoring and Application Center,CEA,Xian 710054,China
Abstract:
First of all,using the GPS velocity field from campaign GPS measurements implemented by CMONC ( China Crustal Movement Observation) and TEONC ( China Tectonic Environment Observation Networks ) up to 2013,we analyzed the background of regional crustal horizontal movement and deformation before the MS7. 3 Yutian, Xinjiang earthquake on February 12,2014. Then,by comparing this to the vertical movement from leveling measurements,we studied the crustal movement deformation and the state of strain accumulation on the northeastern edge of Qinghai -Tibetan block. Finally,we investigated the possible effects on the earthquake activity of the northeastern edge of Tibet from the MS7. 3 Yutian earthquake. The result indicates that,the MS7. 3 Yutian earthquake occurred against the background of strong tectonic movement and intensive intracontinental crustal differential movement on the edges of tectonic blocks in western China,and also that it happened in the period of the strong tectonic stress field in Qinghai-Tibetan block and its edges. The sinistral strike-slip and stress transfer of the Yutian MS7. 3 earthquake may accelerate the rupture of fault segments with high strain accumulation at the northeastern edge of Qinghai-Tibetan block ( especially in Qilian Mountain fault zone,and border area of Gansu,Qinghai and Sichuan provinces on the south of western Qinling) .
Key words:  Seismicity  The 2014 Yutian MS 7.3 earthquake  Crustal movement and deformation  Stress accumulation  The northeastern edge of Qinghai-Tibetan block