深圳断裂带构造活动性分析
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摘要
深圳断裂带的活动性关系到深圳发展的前景,从构造地质学、遥感图像、地震学、地貌学和地球动力学的角度出发,论述了深圳及其邻近地区的地质构造背景,阐述了深圳断裂带的构造活动性。通过对断裂带地层剖面和断层物质研究发现,断裂带晚更新世以来没有明显活动迹象;地震活动方面,断裂带所在区域地震活动以微震为主,且震源分布与断裂带产状一致,反映断裂具有一定的活动性;根据地应力监测资料,最大主应力量值小且应力方向北西向,与断裂近乎垂直,不利于断裂活动。综合各方面因素,认为深圳断裂带晚更新世至今活动已经明显减弱;现代微震活动是其构造能量缓慢释放的表现,现今深圳断裂带构造稳定,不会发生较大规模的活动。
From the structural geology,Remote Sensing Images,seismology,geomorphology and geodynamics,this paper introduces the geological structure background of Shenzhen and its adjacent,the tectonic movement of Shenzhen fracture zone is discussed.We believe that the Shenzhen fracture zone had no perceptible activities since late Pleistocene by fault profiles and fault material;micro earthquakes occurred frequently along this fault segment and foci of quite a few minor shocks detected were located to fall at different depths well within the fault zone,This means the fault is in a stage of action.Based on the actually measured nature stress data of Shenzhen,we find the value of maximum principal stress is small and direction of it is NW,vertical direction of fault. Such a stress state is too low to trigger sudden movement of the fault.The conclusion we reached is Shenzhen fracture zone is in a relative stable state now,modern microearthquakes are the representation of it releasing its tectonic energy slowly,and no sudden large movement of the fault would be expected.
From the structural geology,Remote Sensing Images,seismology,geomorphology and geodynamics,this paper introduces the geological structure background of Shenzhen and its adjacent,the tectonic movement of Shenzhen fracture zone is discussed.We believe that the Shenzhen fracture zone had no perceptible activities since late Pleistocene by fault profiles and fault material;micro earthquakes occurred frequently along this fault segment and foci of quite a few minor shocks detected were located to fall at different depths well within the fault zone,This means the fault is in a stage of action.Based on the actually measured nature stress data of Shenzhen,we find the value of maximum principal stress is small and direction of it is NW,vertical direction of fault. Such a stress state is too low to trigger sudden movement of the fault.The conclusion we reached is Shenzhen fracture zone is in a relative stable state now,modern microearthquakes are the representation of it releasing its tectonic energy slowly,and no sudden large movement of the fault would be expected.
引文
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[3]Lu Yanchou,Sun Jianzhong.An investigation on geomorphologyand quaternary deposition for activity of the Shenzhen fault zone,Guangdong province[J].Seismology and Geology,1991,13(2):138-145.[卢演俦,孙建中.广东深圳断裂带活动性的第四纪地质和地貌研究[J].地震地质,1991,13(2):138-145.]
[4]Zhang Hu'nan,Cheng Weiguang,Huang Kunrong,et al.NewTectonic Activity and Geological Environment of Coastal Areas inSouth China[M].Beijing:Seismological Press,1990:216-222.[张虎男,陈伟光,黄坤荣,等.华南沿海新构造运动与地质环境[M].北京:地震出版社,1990:216-222.]
[5]Chen Weiguang,Zhao Hongmei,Li Fuguang,et al.Fault activityand their influence upon geologic environment in Shenzhen city[J].Tropical Geography,2001,21(1):45-50.[陈伟光,赵红梅,李富光,等.深圳市断裂构造的活动性及其对地质环境的影响[J].热带地理,2001,21(1):45-50.]
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[8]Wei Bolin.Seismotectonic Conspectus of Guangdong Province[M].Beijing:Seismological Press,2000.[魏柏林.广东省地震构造概论[M].北京:地震出版社,2000.]
[9]Li Xingtang,Xu Bing,Huang Dingcheng,et al.Study and Methodon Regional Stability[M].Beijing:Geological Publishing House,1987.[李兴唐,许兵,黄鼎成,等.区域地壳稳定性研究理论与方法[M].北京:地质出版社,1987.]
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