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.
出处
《内陆地震》
2000年第1期38-45,共8页
Inland Earthquake
