| 47 | 0 | 45 |
| 下载次数 | 被引频次 | 阅读次数 |
宁夏北部的银川盆地处于中国南北地震带的北段，盆地南部频发1.0～4.0级弱震，偶发5.0级及以上强震。以往高精度地球物理资料的缺失，制约着深部构造体系的精细解译，直接影响了对该地区发震构造及孕震环境的分析。笔者以新采集的1∶5万区域重力资料为基础，运用小波多尺度分解、边界识别、钻孔约束下的界面反演等技术，精细分析了断裂构造与局部构造单元的展布特征，并结合地震分布特征，从震中平面位置和震源纵向深度两个方面探讨了研究区地震活动与深部构造之间的空间配置关系。结果显示：受黄河断裂与吴忠断裂控制，绝大多数地震发生于灵武坳陷内，震中位置与断裂构造具有高度的对应性，边界断裂与地震对应性比较一致，不会随着断裂向深部延伸而发生变化；震源深度与深部构造展布配置关系密切，震源深度大于20 km的地震，集中分布于永宁北、望洪南、郝家桥、叶盛北4个区域，均是断裂构造交汇、归并、错断区域，推测是构造应力积累后突然释放的构造部位。
Abstract：The Yinchuan Basin in the northern part of Ningxia is located in the northern section of the North-South Seismic Belt in China. Weak earthquakes of magnitude 1.0～4.0 occur frequently, and strong earthquakes above magnitude 5.0 occur occasionally in the southern part of the basin. Previously, the lack of high-precision geophysical data has restricted the fine interpretation of deep structural systems, directly affecting the analysis of seismogenic structures and seismogenic environments in this area. Based on the newly collected 1:50,000 regional gravity data, the author utilized techniques such as wavelet multi-scale decomposition, boundary identification, and interface inversion under borehole constraints to meticulously analyze the distribution characteristics of fault structures and local structural units. Combined with the spatial distribution of earthquakes, the spatial configuration relationship between seismic activities and deep structures in the study area was discussed from two aspects: the planar position of the epicenter and the longitudinal depth of the source. The results show that under the control of the Yellow River Fault and the Wuzhong Fault, the vast majority of earthquakes occur within the Lingwu Depression. The epicenter location has a high degree of correspondence with the fault structure. The boundary fault has a relatively consistent correspondence with the earthquake and will not change as the fault extends deeper. The focal depth is closely related to the distribution and configuration of the deep structure. For earthquakes with a focal depth greater than 20 kilometers, they are mainly distributed in four areas: north of Yongning, south of Wanghong, Haojiaqiao and north of Yesheng. All of them are areas where fault structures converge, merge and or offset. It is speculated that they are the structural parts where tectonic stress suddenly released after accumulating.
[1] 宁夏回族自治区地质调查院.中国区域地质志-宁夏志[M].北京：地质出版社，2017.Ningxia Hui Autonomous Region Geological Survey Institute.Regional geology of China[M].Beijing:Geological Publishing House,2017.
[2] 雷启云，柴炽章，杜鹏，等.1739年平罗8级地震发震构造[J].地震地质，2015,37(2):413-429.Lei Q Y,Chai C Z,Du P,et al.The seismogenic structure of the m8.0 Pingluo earthquake in 1739[J].Seismology and Geology,2015,37(2):413-429.
[3] 李燕，刘保金，酆少英，等.利用地震折射和反射波资料研究银川盆地浅部结构和隐伏断裂[J].地球物理学报，2017,60(8):3 096-3 109.Li Y,Liu J B,Feng S Y,et al.Exploration of shallow structure and buried faults in the Yinchuan basin using seismic refraction and reflection data [J].Chinese Journal of Geophysics,2017,60(8):3 096-3 109.
[4] 雷启云，柴炽章，郑文俊，等.钻探揭示的黄河断裂北段活动性和滑动速率[J].地震地质，2014,36(2):464-477.Lei Q Y,Chai C Z,Zheng W J,et al.Activity and slip rate of the northern section of the Yellow River fault revealed by drilling[J].Seismology and Geology,2014,36(2):464-477.
[5] 包国栋，陈虹，胡健民，等.银川盆地东缘黄河断裂第四纪活动与分段性研究[J].地球学报，2019,40(4):614-628.Bao G D,Chen H,Hu J M,et al.Quaternary activity and segmentation of the Yellow River fault of the eastern margin of Yinchuan graben[J].Acta Geoscientica Sinica,2019,40(4):614-628.
[6] 刘雷，蒋锋云，朱良玉.银川盆地水平运动和地震活动特征分析[J].大地测量与地球动力学，2018,38(1):36-42.Liu L,Jiang F Y,Zhu L Y.Analysis of horizontal movement and seismicity in Yinchuan Basin[J].Journal of Geodesy and Geodynamics,2018,38(1):36-42.
[7] 罗国富，贺永忠，师海阔.银川盆地有感地震活动特征及其震感强烈原因分析[J].防灾减灾学报，2013,29(4):19-24.Luo G F,He Y Z,Shi H K.Yinchuan basin have feeling earthquake activity characteristics and felt strong reason analysis[J].Journal of Disaster Prevention and Reduction,2013,29(4):19-24.
[8] 赵卫明，金延龙，刘秀景，等.吴忠、灵武地区地震的精确定位和中强地震的发震构造[J].内陆地震，1998,12(4):304-311.Zhao W M,Jin Y L,Liu X J,et al.Accurate location of earthquakes in Wuzhong and Lingwu regions and the seismogenic tectonics of moderate earthquakes in these regions[J].Inland Earthquake,1998,12(4):304-311.
[9] 陈晓晶，虎新军，白亚东，等.银川盆地南部灵武凹陷基底构造特征[J].物探与化探，2022,46(4):862-867.Chen X J,Hu X J,Bai Y D,et al.Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin[J].Geophysical and Geochemical Exploration,2022,46(4):862-867.
[10] 杜鹏，柴炽章，廖玉华，等.贺兰山东麓断裂南段套门沟—榆树沟段全新世活动与古地震[J].地震地质，2009,31(2):256-264.Du P,Chai C Z,Liao Y H,et al.Study on Holocene activity of the south segment of the eastern piedmont fault of Helan mountains between Taomengou and Yushugou[J].Seismology and Geology,2009,31(2):256-264.
[11] 赵成彬，刘保金，酆少英，等.芦花台断裂的三维结构特征[J].大地测量与地球动力学，2013,33(6):41-44+48.Zhao C B,Liu B J,Feng S Y,et al.Three dimension structure of Luhuatai fault[J].Journal of Geodesy and Geodynamics,2013,33(6):41-44+48.
[12] 虎新军，李宁生，周永康，等.银川平原断裂体系划分与研究[J].矿产与地质，2018,32(6):1 075-1 083.Hu X J,Li N S,Zhou Y K,et al.Division and study of fracture system in Yinchuan Plain[J].Mineral Resources and Geology,2018,32(6):1 075-1 083.
[13] 陈晓晶，虎新军，李宁生，等.银川平原基于地球物理资料三维建模的深部地质构造研究[J].物探与化探，2020,44(2):245-253.Chen X J,Hu X J,Li N S,et al.Research on the deep geological structure in Yinchuan Plain:3D modeling based on geophysical data[J].Geophysical and Geochemical Exploration,2020,44(2):245-253.
[14] 雷启云，张培震，郑文俊，等.青藏高原东北缘三关口-牛首山断裂的右旋走滑与弧形构造带扩展[J].中国科学：地球科学，2016,46(5):691-705.Lei Q Y,Zhang P Z,Zheng W J,et al.Right-lateral strike-slip of Sanguankou-Niushoushan fault in the northeastern margin of Qinghai-Tibet Plateau and the expansion of arc structural belt[J].Scientia Sinica (Terrae),2016,46(5):691-705.
[15] 方盛明，赵成彬，柴炽章，等.银川断陷盆地地壳结构与构造的地震学证据[J].地球物理学报，2009,52(7):1 768-1 775.Fang S M,Zhao C B,Chai C Z,et al.Seismic evidence of crustal structures in the Yinchuan faulted basin[J].Chinese Journal of Geophysics,2009,52(7):1 768-1 775.
[16] 酆少英，高锐，龙长兴，等.银川地堑地壳挤压应力场：深地震反射剖面[J].地球物理学报，2011,54(3):692-697.Feng S Y,Gao R,Long C X,et al.Crustal compression stress field in Yinchuan graben:Deep seismic reflection profile [J].Journal of Geophysics,2011,54(3):692-697.
[17] 侯旭波，尹克敏，林中凯，等.银川盆地构造反转及其演化与叠合关系分析[J].高校地质学报，2014,20(2):277-285.Hou X B,Yin K M,Lin Z K,et al.The study of tectonic inversion,evolution,and superposition of Yinchuan Basin[J].Geological Journal of China Universities,2014,20(2):277-285.
[18] 黄兴富，施炜，李恒强，等.银川盆地新生代构造演化：来自银川盆地主边界断裂运动学的约束[J].地学前缘，2013,20(4):199-210.Huang X F,Shi W,Li H Q,et al.Cenozoic tectonic evolution of the Yinchuan Basin:Constraints from the deformation of its boundary faults[J].Earth Science Frontiers,2013,20(4):199-210.
[19] 毕丽思，任镇寰，叶秀薇，等.基于重力资料从深部断裂系统讨论湛江湾地区的发震构造[J].地震地质，2018,40(6):1 332-1 348.Bi L S,Ren Z H,Ye X W,et al.Discussion on the seismogenic structure of Zhanjiang bay area from the view of deep fault system interpreted based on the gravity data[J].Seismology and Geology,2018,40(6):1 332-1 348.
[20] 杨宇山，李媛媛，刘天佑，等.小波细节的微分特征及其在重力场断裂分析中的应用[J].地质与勘探，2003,39(1):41-44.Yang Y S,Li Y Y,Liu T Y,et al.The differential characteristic of the wavelet details and its application in fault analysis of gravity field[J].Geology and Prospecting,2003,39(1):41-44.
[21] 付强，刘天佑，马龙，等.基于小波变换和均衡重力异常的断裂识别——以柴达木盆地及周边地区为例[J].地震地质，2019,41(4):960-978.Fu Q,Liu T Y,Ma L,et al.Wavelet transform analyses of faults detection on isostatic gravity anomalies:A case study from the Qaidam Basin and its adjacent areas[J].Seismology and Geology,2019,41(4):960-978.
[22] 白亚东，李宁生，虎新军，等.利用1∶20万区域重力资料研究宁夏断裂体系[J].工程地球物理学报，2018,15(3):330-337.Bai Y D,Li N S,Hu X J,et al.The research on Ningxia fault system by using 1∶200 000 regional gravity data[J].Chinese Journal of Engineering Geophysics,2018,15(3):330-337.
[23] 虎新军，李宁生，陈涛涛，等.边界识别技术在内蒙金巴山铜矿区断裂划分中的应用[J].物探化探计算技术，2020,42(2):277-284.Hu X J,Li N S,Chen T T,et al.Application of boundary detection method in fault division of the copper mine in Jinbashan,Inner Mongolia[J].Computing Techniques for Geophysical and Geochemical Exploration,2020,42(2):277-284.
[24] 刘金兰，李庆春，赵斌.位场场源边界识别新技术及其在山西古构造带与断裂探测中的应用研究[J].工程地质学报，2007,15(4):569-574.Liu J L,Li Q C,Zhao B.New detection techniques of geologic boundaries using potential-field data and its application in the Shan’xi paleo-structure zone and faults[J].Journal of Engineering Geology,2007,15(4):569-574.
[25] 虎新军，陈晓晶，曹园园，等.固原硝口岩盐矿区及其周缘断裂体系与特征[J].工程地球物理学报，2021,18(4):428-435.Hu X J,Chen X J,Cao Y Y,et al.Fracture system and characteristics of Xiaokou rock salt mining area and its surrounding areas in Guyuan[J].Chinese Journal of Engineering Geophysics,2021,18(4):428-435.
[26] 虎新军，安娜，陈晓晶.基于地球物理资料的银川盆地南部构造特征分析[J].工程地球物理学报，2023,20(5):652-660.Hu X J,An N,Chen X J.Analysis of structural characteristics of southern Yinchuan Basin based on geophysical data[J].Chinese Journal of Engineering Geophysics,2023,20(5):652-660.
基本信息:
中图分类号:P315
引用信息:
[1]虎新军,陈晓晶,曾宪伟,等.银川盆地南部地震活动与深部构造关系分析[J].工程地球物理学报,2025,22(06):705-714.
基金信息:
宁夏自然科学基金项目(编号:2022AAC03652); 宁夏回族自治区青年科技人才托举工程项目(编号:NXCZ20220206)