拉萨盆地隐伏断裂浅层反射地震探测及断层活动性分析

发布时间：2018-07-26 12:14

【摘要】：为探测拉萨山间盆地隐伏活动断裂,采用人工震源的浅层地震勘探方法,提出了该地区地质条件下隐伏断裂勘探时震源选择、观测系统设计以及参数确定、数据处理与资料解释、断层识别的基本方法,查明了娘热断裂、那林拉卡断裂、拉萨断裂、夺底断裂的走向、倾向、上断点埋深及其在地表的垂直投影位置等主要参数,探测表明拉萨市城近地区发育有娘热、那林拉卡、拉萨、夺底等4条北西-北西西向断裂;娘热断裂和夺底断裂近垂直或高角度北倾,为逆走滑或走滑断层;那林拉卡断裂和拉萨断裂近垂直或高角度南倾为主,也是逆走滑断层;娘热、那林拉卡、拉萨、夺底等4条断裂均为晚更新世活动断层,平均垂直滑动速率为0.27~0.40 mm/a。为拉萨盆地及周边地区活动断层研究提供了基础资料,填补了该地区浅层地震勘探资料的空白。
[Abstract]:In order to detect the concealed active faults in the Lhasa intermountain basin, using the shallow seismic exploration method of artificial seismic source, this paper puts forward the selection of seismic source, the design of observation system and the determination of parameters for the exploration of concealed faults under geological conditions in this area. Data processing and data interpretation, the basic method of fault identification, the main parameters such as Niangre fault, Nalinlaka fault, Lhasa fault, bottom fracture strike, tendency, buried depth of the upper fracture point and its vertical projection position on the surface have been identified. The results show that Niangre, Nalinlaka, Lhasa and bottom trending faults are developed in the vicinity of the city of Lhasa, and Nianghot fault and bottom fault are nearly vertical or high angle northward, which are reverse strike-slip or strike-slip faults. The Nalinlaka fault and Lhasa fault tend to be nearly vertical or high angle southward, which are also reverse strike-slip faults, while Niangre, Nalinlaka, Lhasa and bottom grafts are all active faults of late Pleistocene, with an average vertical slip rate of 0.27 ~ 0.40 mm / a. It provides basic data for the study of active faults in the Lhasa basin and the surrounding areas, and fills up the gaps in the shallow seismic exploration data in this area.
【作者单位】：西藏自治区地震局;河北地质大学勘查技术与工程学院;中国地震局地球物理研究所;河北省地震局;
【基金】：中国数字地震观测网络工程(1-4-11)资助
【分类号】：P631.4

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