摘要
利用网格化插值方法处理唐山微震观测的地震定位数据,得到震级分布、发震时间和震源深度图像。震级分布图像反映了沿北东向条带状分布特征,与唐山-古冶、唐山-陡河与北东向的唐山断裂带有一定的对应关系;发震时间图像反映出北东、北西、北北西向等线性特征;唐山小震震源深度主要分布在中上地壳,震源深度图像的中部和北部震源深度较浅,说明断裂上盘逆冲,故上盘的震源深度较浅;而南部震源深度较深,反映断裂下盘下降。
Through data processing the location results of micro earthquake in Tangshan region with grid interpolation method the distribution patterns of earthquake magnitudes, original times and hypoeentral depths were obtained. The pattern of magnitude distribution is characterized proximately by northeastern zones along Tangshan-Guye,Tangshan-Douhe, which correspond to the NE Tangshan fault belt. The pattern of original time distribution is characterized by NE, NW and NNW zones. The hypocenters are mainly in the middle and upper crust. In the central and northern regions the hypocenters are shallower that indicates the NW part of the fault （ hanging wall） thrust, so the hypocenters in the NW thrust upper block are shallower, while in the southern region the hypocenters are deeper. It indicates the hypocenters in the SE lower block are deeper.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第6期32-34,39,共4页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40774043
40674043
90814001)
财政部南北地震带紧急强化震情跟踪专项
中国地震局地球物理勘探中心论著RCEG0904
关键词
唐山地区
微震观测
震源分布
震级分布
发震时间分布
Tangshan region
micro earthquake observation
hypocentral distribution
magnitude distribution
original time distribution
