摘要
福建省闽南三角地区地球物理场特征是以永定—福州北东东向断裂带为界,南北两区的磁场、重力场、大地电磁场及应力场等均有明显差异。闽南三角地区的岩石圈厚度、地壳厚度变化大,莫霍面处的纵波速度(V_p)低,上地幔物质分异不彻底,活动断裂发育,地震活动频繁,可知该区地壳处于不稳定状态。应用地质及地球物理资料综合解释,依据地壳结构及构造、地震活动规律、活动断层分布及地震烈度等条件,在地壳区域不稳定的背景上,划分出三个地壳区域较稳定小区。
The physical field in the South Fujian is divided by the fault zone from Yongding to Fuzhou in the NEE direction into two regions. There are geophysical characters (magnetic, gravity, telluric electromagnetic and stress fields) obvious differential from the North region in South region.
The crust in the South Fujian is in instable state as indicated by the wide range of variation of thickness of lithosphere and crust, the lower velocity (V_p) at Moho, incomplete differentiation of the substance in the upper mantle, development of active fault, and frequent seismic activity.
Three crustal stabler subregions can be separated out from the regional instable gegions by characters in geology and geophysics, based on the crustal architecture and structure, the rule of seismic activity, the distribution of active faults and the intensity of earthquakes.
出处
《福建地质》
1990年第3期167-176,共10页
Geology of Fujian
