深圳地区的地震活动与现今构造应力场

THE SEISMIC ACTIVITY AND CURRENT TECTONIC STRESS FIELD IN SHENZHEN AREA

本文以微震台网监测、地震活动分析,并结合地应力测量、构造模拟实验等项资料,研究并讨论了深圳地区的地震活动性与现今构造应力场。得出,区内现代地震活动主要为浅源微震,频度与强度均偏低。现今构造活动以水平为主,最大主压应力为NW-SE向在广东莲花山活动性断裂带中,深圳地区处于相对较稳定的地段。区内NE向深圳断裂束今后活动趋于减弱,NW向断裂活动可能稍有加强。该区主应力值属中等量级,最大剪切应力值很低,接近等压状态,在相当长的时间内不会发生较大的构造活动。

According to the Tesearch materials of microse-ismic surveillance and the seismic activity analysiscombined with the stress measuiement as weil as thetectonic model experiment, the seismic activity andcurrent tectonic stress field in Shenzhen area arediscussed. It is concluded that the contemporaryareal seismic activity mainly appears as shallowfocus microseism of low frequency and strength.The current structural activity is predominately inform of horizontal movement with the major stressin NW-SE direction. The Shenzhen area is re ativelystable in the Lianhuashan active fault zone. TheShenzhen fault bundle in NE direction tends towarddeclining in activity; on the contraty, that in NWdirection may be increasing in activity. The princi-pal stress in this area is of medium value and themajor shear stiess is very low.