海口市江东新区马袅-铺前断裂第四纪活动特征  

Quaternary activity characteristics of the Maniao-Puqian fault in the Jiangdong New District of Haikou

作　　者：王超群[1] 贾丽云[1,2] 胡道功 胡健民[1] 张磊 杨肖肖[1] 孙东霞 麦发海 白世彪 宗开红 吕同艳 张耀玲[1,2] 韩帅[1,2] 韩建恩 杜建军[1] WANG Chaoqun;JIA Liyun;HU Daogong;HU Jianmin;ZHANG Lei;YANG Xiaoxiao;SUN Dongxia;MAI Fahai;BAI Shibiao;ZONG Kaihong;Li Tongyan;ZHANG Yaoling;HAN Shuai;HAN Jian’en;DU Jianjun(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Key Laboratory of Active Tectonics and Geological Sa fety,Ministry of Natural Resources 9 Beijing 100081,China;Hainan Geological Survey and Design Institute,Haikou,Hainan 570206,China;College of Marine Science and Engineering,Nanjing Normal University,Nanjingj Jiangsu 210023,China;Jiangsu Geological Survey Research Institute,Nanjing,Jiangsu 210049,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部活动构造与地质安全重点实验室,北京100081 [3]海南省地质综合勘察院,海南海口570206 [4]南京师范大学海洋科学与工程学院,江苏南京210023 [5]江苏省地质调查研究院,江苏南京210049

出　　处：《地质学报》2022年第2期403-417,共15页Acta Geologica Sinica

基　　金：中国地质调查局项目(编号DD20190306、DD20160206和DD20190546)联合资助的成果。

摘　　要：1605年7月13日在海南琼山发生的M71/2级大地震为南海北部陆缘地震带破坏性最大的一次地震,这次地震造成琼北海岸带大面积沉陷与东寨港100余平方千米的陆陷成海,地震震中与强烈沉降区均位于目前正在规划建设的海口江东新区。构造地貌调查与钻孔联合剖面揭露表明,分布于江东新区的马袅-铺前断裂带由马袅-罗豆断层(F_(2-1))、海秀-东园断层(F_(2-2))及长流-珠溪河断层(F_(2-3))3条NEE向平行展布的北倾正断层组成,陆域全长约132 km,呈隐伏—半隐伏状态,总体表现为正断性质,局部兼右旋走滑。其中F_(2-1)断层长约132 km,第四纪以来断层垂直位移3.4~14.8 m,最新活动时代为早—中更新世;F_(2-2)断层长度大于50 km,全新世以来断层垂直位移1.8~3.3 m,最新活动时代为全新世,根据地震楔及断塞塘堆积判断F_(2-3)断层为琼山M71/2级地震的发震构造;F_(2-1)断层长约58 km,上新世地层垂直位移112 m,最新活动时代为早—中更新世。结合马袅-铺前断裂带的最新活动时代及其与琼山M71/2地震的关系,提出了江东新区规划建设及建筑物避让活动断层的建议。The 1605 Qiongshan M71/2 earthquake in Haikou, Hainan Province was the most destructive earthquake in the northern continental margin of the South China Sea. The earthquake caused massive subsidence and over 100 km;of land sank into the sea in the coastal zone of the Dongzhai Harbor area. The earthquake epicenter and strong subsidence area is located in the Jiangdong New District(JND) of Haikou which are now in the planning and construction of Hainan Province. The systematic investigation of tectonic landform and composite drilling geological section revealed that the Maniao-Puqian fault(MPF) zone in the JND is composed of three north-dipping normal faults parallel to NEE i.e. the Maniao-Luodou fault(F_(2-1)), the Haixiu-Dongyuan fault(F_(2-2)) and the Changliu-Zhuxihe fault(F_(2-3)). The total length of the fault zone is about 132 km, which is complete or partially hidden. The overall performance is a normal fault, and the right lateral strike slip is the local segment. The length of the F_(2-1)is ~132 km with vertical displacement ranging from 14.8 m to 3.4 m since Quaternary, the latest active age of the fault is about late Pleistocene. The length of the F_(2-2)is more than 50 km with vertical displacement between 3.3 m to 1.8 m during the Holocene, the latest active age of the fault is Holocene. According to the seismic wedge and fault sag-pond accumulation, it is determined that the F_(2-1), a branch fault of the MPF zone, is the seismogenic structure of the M71/2 Qiongshan earthquake. The length of the F_(2-3)is~58 km with vertical displacement of 112 m since Pliocene, the latest active age of the fault is between early and middle Pleistocene. The redefinition of the MPF zone structure, the latest active age of the fault and the determination of the seismogenic structure of the Qiongshan M71/2 earthquake are of great significance for the planning and construction of JND of Haikou and the avoidance of active fault for general or particular structure and building in this area.

关 键 词：琼山M71/2级地震 发震构造 活动断层避让 马袅-铺前断裂 海口江东新区 

分 类 号：P315[天文地球—地震学] P542[天文地球—固体地球物理学]