乌鲁木齐市2条隐伏活动断裂分布与活动性及其对建(构)筑物的影响
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摘要
在乌鲁木齐市地震安全性评价工作中对分布的八钢—石化及乌鲁木齐河 2条活动断裂进行了浅层地震勘探、断层气体地球化学探测与甚低频电磁勘测 ,并对隐伏活动断裂的分布、产状、活动性、活动时代及其对横跨其上的建 (构 )筑物的影响进行了分析和评价。结果表明 :八钢—石化隐伏活动断裂主断面南倾 ,倾角为 75°～ 85°,切错了下更新统—中更新统 ,为中更新世晚期活动断裂 ;乌鲁木齐河隐伏活动断裂主断面西倾 ,倾角为 70°,具正断层性质 ,切错了晚更新世与 TL 地质年龄为11150± 880 a的卵砾石层 ,垂直活动速率为 0 .13mm/ a,为全新世早期活动断裂。这 2条活动断裂对横垮其上方的建 (构 )筑物及工程的安全与稳定均有影响。
In the work of Urumqi seismic safty evaluation,shallow seismic prospecting,geochemical survey of fault gas and VLF electromagnetic prospecting were done on two concealed active faults,Bagang-Shihua Fault and Urumqi River Fault;the distribution,occurrence,activity,active time of two faults were analysed and the effects of the faults on structures across them was evaluated.The results show:the principal fault plane of Bagang-Shihua Fault dips toward south,and the angle of dip is 75°~85°;the fault offsets Lower Pleistocene Middle Pleistocene,being a late Middle Pleistocene active fault.The principal fault plane of Urumqi River Fault dips toward west with the dip angle of 70°;the fault has the character of normal fault,offsets the cobble layers in Late Pleistocene and in 11 150±880 a(TL age),the vertically active rate of which is 0.13 mm/a,and which is an early Holocene active fault.These 2 faults have effects on the safty and stability of the structures and engineerings across them.
In the work of Urumqi seismic safty evaluation,shallow seismic prospecting,geochemical survey of fault gas and VLF electromagnetic prospecting were done on two concealed active faults,Bagang-Shihua Fault and Urumqi River Fault;the distribution,occurrence,activity,active time of two faults were analysed and the effects of the faults on structures across them was evaluated.The results show:the principal fault plane of Bagang-Shihua Fault dips toward south,and the angle of dip is 75°~85°;the fault offsets Lower Pleistocene Middle Pleistocene,being a late Middle Pleistocene active fault.The principal fault plane of Urumqi River Fault dips toward west with the dip angle of 70°;the fault has the character of normal fault,offsets the cobble layers in Late Pleistocene and in 11 150±880 a(TL age),the vertically active rate of which is 0.13 mm/a,and which is an early Holocene active fault.These 2 faults have effects on the safty and stability of the structures and engineerings across them.
引文
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