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京西北地区地应变观测与小震震源机制解一致性研究
茅远哲, 曹筠, 高晨, 冯向东, 王晓山
河北省地震局, 石家庄 050021
摘要:
以京西北地区作为研究区域,采用应变参数方法解算定点地应变观测数据,将所得应变参数时间序列作为研究对象,利用该结果与研究区内同期小震震源机制解进行一致性分析,研究得出呈拉张性质的定点观测最大主应变方位与震源机制解最大拉张变形方向(T轴)水平投影具有良好的对应性,整体以NNW—NE向为主,且自西向东排布的测点最大主应变方位与震源机制解最大拉张变形方向均表现为逐渐东向偏移的趋势,与华北平原块体北部发生顺时针旋转活动的特征相吻合,结果进一步检验了地应变观测反映区域应变场信息的能力。
关键词:  地应变观测  最大主应变  震源机制解  最大拉张变形方向
DOI:
分类号:P315
基金项目:河北省地震局地震科技星火计划青年项目(DZ20180321020)资助
Consistency of Ground Strain Observation and Source Mechanism Solution of Small Earthquakes in Northwest Beijing
Mao Yuanzhe, Cao Jun, Gao Chen, Feng Xiangdong, Wang Xiaoshan
Hebei Earthquake Agency, Shijiazhuang 050021, China
Abstract:
We took Beijing as the study area in the northwest region,and calculated the fixed point strain observations data with strain parameters and obtained their time series as the research object. We carried out the consistency analysis between the results and the results are of the focal mechanism solution of small earthquakes of the same period in the research zone. The result shows that there is a good correspondence between the tensile properties of fixed-point observation maximum direction of the principal strain and the focal mechanism solutions of maximum tensile deformation direction(axis T). The general direction is NNW to NE. The maximum principal strain direction and focal mechanism solutions of maximum tensile deformation direction both showed an eastward migration arranged in the direction from west to east,which matches the clockwise activities of the northern North China Block. The result further proves that the strain observations can reflect the regional strain field information.
Key words:  Deformation strain observation  Maximum main strain  Source mechanism solution  Maximum tension deformation direction