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针对渤海周边地区及营口-潍坊断裂带,收集并统一处理该地区1999年以来的GPS数据,依据最新的观测成果跟踪该区域地壳运动的动态变化;采用块体运动方程计算营口-潍坊断裂带的活动速率,并分析该断裂带的活动性质。结果表明,1999-2010年营口-潍坊断裂带为右旋,2011-2013年为左旋,日本3·11地震使北北东向营口-潍坊断裂带改变了走滑活动性质,反映了3·11地震使华北东部区域应力场有明显地变化,也表明华北地区的构造活动受印度-欧亚碰撞带和太平洋-欧亚板块俯冲带的活动程度制约。日本3·11大地震使本区拉张显著,应变能有一定卸载性变化。本文的研究结果对于理解营潍断裂带地震活动性与规律及区域动力学状况具有一定的参考价值。
For the areas around Bohai Sea and Yingkou-Weifang fault zone, the GPS data of the area since 1999 are collected and unified, and the dynamic changes of crustal movement in this area are tracked based on the latest observations. The block motion equation is used to calculate the Yingkou-Weifang fault zone Activity rate, and analyze the nature of the activity of the fault zone. The results show that the Yingkou-Weifang fault zone was dextral from 1999-2010 and the L-rotation was from 2011 to 2013. The 3.11 earthquake in Japan altered the strike-slip activity of the north-north east Yingkou-Weifang fault zone, The earthquake has obviously changed the stress field in the eastern part of North China. It also shows that the tectonic activity in North China is controlled by the degree of activity of the Indian-Eurasian collision zone and the Pacific-Eurasian plate subduction zone. The earthquake of 3.11 in Japan made the stretch in the area significant and the strain energy had some unloading changes. The results of this paper have certain reference value for understanding the seismic activity and regularity of the Yingwei fault zone and the regional dynamic state.