CAJ | 학술논문

防城-灵山断裂北东支灵山段为北部湾经济区内地震活动最为频繁的地区。为了查明防城-灵山断裂带北东支灵山段的断裂活动变形特征,尤其是在活动性特征的关键部位控制断裂构造的产状特征,断裂产状深部变化、断裂带规模及展布方向,本文通过遥感解译、地质地貌调查以及浅层地震和地质雷达勘探等物探方法对广西防城-灵山断裂带北东支灵山段的平面展布特征以及活动性进行了初步探讨。结果表明该断裂带呈北东向展布并被多条北西向断裂错断,东西边界分别为灵山断裂和石塘断裂。灵山断裂错断了晚更新世洪积扇阶地,河流流经灵山断裂后发生右旋偏转;石塘断裂表现为宽约250 m的破碎带,次级断裂密集发育。物探结果显示防城-灵山断裂北东支灵山段的东西两支在晚更新世以来均具有较强的活动性。
방성-령산단렬북동지령산단위북부만경제구내지진활동최위빈번적지구。위료사명방성-령산단렬대북동지령산단적단렬활동변형특정,우기시재활동성특정적관건부위공제단렬구조적산상특정,단렬산상심부변화、단렬대규모급전포방향,본문통과요감해역、지질지모조사이급천층지진화지질뢰체감탐등물탐방법대엄서방성-령산단렬대북동지령산단적평면전포특정이급활동성진행료초보탐토。결과표명해단렬대정북동향전포병피다조북서향단렬착단,동서변계분별위령산단렬화석당단렬。령산단렬착단료만경신세홍적선계지,하류류경령산단렬후발생우선편전;석당단렬표현위관약250 m적파쇄대,차급단렬밀집발육。물탐결과현시방성-령산단렬북동지령산단적동서량지재만경신세이래균구유교강적활동성。
Seismic activity in northeast branch of Fangcheng-Linshan fault appeared most frequently in Beibu Gulf economic zone.The work of this paper is to identify the deformation characteristics and activity of northeast branch of Fangcheng-Linshan fault,especially the occurrence and its changes in depth,the scales and spreading characteristics of the faults in the key parts.Areal distribution characteristics and activity of the northeast branch of the Fangcheng-Lingshan fault zone in Lingshan was preliminary discusses by remote sensing interpretation,geological and geomorphological survey,as well as shallow seismic reflection and ground prospecting radar（GPR）.The results indicated that the fault was offset by a number of northwest-trending faults,east and west margin of which are Lingshan fault and Shitang fault,respectively.Linshan fault offset the alluvial fan terraces formed in late Pleistocene.The streams were dextral at Linshan fault.Shitang fault presented a fracture zone with 250 m width,where secondary faults were dense.The images of geophysical exploration showed that both of the two branches of Fangcheng-Linshan fault had a relative strong activity since the Late Pleistocene.