首都圈地区现今垂直形变对一些中等地震的疑似反映研究  

Suspected Reflections of Vertical Deformation to Moderate Earthquake in the Capital Region

作　　者：畅柳[1] 马庆尊[1] 许明元[1] 张俊青[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《华北地震科学》2016年第1期30-35,共6页North China Earthquake Sciences

基　　金：中国地震局监测;预报;科研三结合(153306);中国地震局第一监测中心科技创新主任基金(FMC2015005);中国大陆现代垂直形变图集的编制与资料整编(2015FY210400)

摘　　要：基于首都圈1983—2014年6期区域精密水准观测成果,分析华北地区近30年的垂直形变演化规律,探讨该时空范围内3次M_S4.0以上地震前垂直形变前兆特征以及震后形变恢复过程。结果表明,首都圈地区的垂直形变整体上是西北升、东南降的继承性运动,并在此大背景下存在局部的垂直波动;研究区域内3次M_S4.0以上地震震前5~7年,在震中附近长轴150km左右的范围均出现了局部垂直形变异常变化,震前异常消失,显示该地区中等强度地震有可能发生于经历比较明显的地壳运动之后转入相对平静的时空范围。Crust vertical deformation and its characteristics in the past three decades is analyzed in accordance with precise re-leveling data（1983-2014）in the Chinese capital region,and the vertical deformation characteristics in this area before and after three MS〉4.0earthquakes are presented.The results show that the inheritance motion is dominant in the deformation field,which means there are uplift in the northwest（mountain zone）and subsidence in the southeast（basin and plain zone）,as well as partial vertical fluctuations in such background.The results also show that vertical deformation anomalies appeared about150 km near the epicenter and 5-7years before the MS〉4.0earthquakes,and then anomalies disappeared before the earthquakes.It may mean that in this region middle strong earthquake may occur during a relatively quiet period after a period of perceivable crustal movement.

关 键 词：首都圈地区 垂直形变 前兆异常 演化特征 

分 类 号：P315.725[天文地球—地震学]