海洋地质与第四纪地质2025，Vol.45Issue(2)：98-109,12.DOI:10.16562/j.cnki.0256-1492.2024031901
连云港市主要断裂活动性研究
Researches on activities of main faults in Lianyungang City
摘要
Abstract
Geological and geomorphological survey,high accuracy shallow seismic P-wave reflection and refraction exploration and S-wave exploration,borehole joint geological section drilling across fault,and age dating technologies were applied for the surveying on active fault in Lianyungang City,Jiangsu,East China.Nine main faults were prospected.The Quaternary activities of three typical faults including the Haizhou-hanshan Fault(F1)were studied with the first hand documents in high quality obtained in this project.Results show that the NNE-trending F1 and the NE-trending Shaoxianghe Fault(F3)are probably the early Quaternary faults,while the NW-trending Nancheng-xinpu Fault(F8)and other main faults are all pre-Quaternary faults.Lianyungang City situates on the Quaternary weakly active tectonic zone in the eastern part of China,and it shares similar seismo-tectonic background with the Shandong Peninsula to the north.Both the Quaternary fault activity and the seismicity are weak.In history,only one destructive earthquake was recorded in the city area,i.e.the 1495 Haizhou M43/4 earthquake.Epicenters of earthquakes with magnitude≥6 concentrated in peripheral regions,namely,along the NNE-trending Tanlu Fault Zone,the NW-trending Bohai-Weihai Fault Zone,and in the northern depression and the southern depression of the south Yellow Sea.The potential earthquake outbreaks with M5±0.5 in future in Lianyungang City are possible judging from the structural analogy principle.However,the influences of strong earthquakes on the study area from adjacent Tanlu Fault Zone and the northern or southern depression of the south Yellow Sea could overtake the local geological forces thus cannot be neglected.For example,the 1668 Tancheng M8½ earthquake at the Tanlu Fault Zone reached IntensityⅧin the Lianyungang area.Thus,risks of both local earthquakes with M5±0.5 and strong earthquakes from surrounding areas should be considered with great concern with effective prevention and disaster reduction measurement of Lianyungang City.关键词
断裂活动性/活动断层探测/构造弱活动区/第四纪/连云港Key words
fault activities/detection of active fault/weak tectonic active zone/Quaternary/Lianyungang分类
地质学引用本文复制引用
张建民,王志才,付俊东,王冬雷,夏暖,王凯,许洪泰,王雷..连云港市主要断裂活动性研究[J].海洋地质与第四纪地质,2025,45(2):98-109,12.基金项目
国家自然科学基金项目"安丘-莒县断裂现今分段运动特征及强震风险的GPS精化研究"(41974105),"郯庐断裂带临沂-广济段岩石圈电性结构及其动力学意义研究"(41574066) （41974105）
山东省地震工程研究院"连云港市活动断层探测与地震危险性评价项目"(LYGZR201312001) （LYGZR201312001）
山东省地震局重点业务专项(YW2305) （YW2305）
