SHALLOW SEISMIC STRATIGRAPHIC RECORDS OF EARTHQUAKES IN THE RADIAL SAND RIDGE FIELD OF SOUTH YELLOW SEA
-
摘要: 南黄海辐射沙脊群中部黄沙洋潮流通道的浅层地震剖面揭示了3处典型海底滑坡,滑坡区域西南距如东大洋口34.5 km,南距西太阳沙人工岛17.1 km。潮流通道中段北侧,即蒋家沙南坡的滑坡规模较大,滑坡后壁下滑错断达15 m,宽度超过300 m;潮流通道中段南侧,即茄儿杆子沙北坡东西两处探测到的滑坡形态相似且距离接近,应为同一滑坡体,为中型等级。黄沙洋潮流通道近几十年沉积动力环境基本稳定,滑坡体各错断上部均无沉积物覆盖,故推断1984年5月21日南黄海Ms 6.2级地震是诱发这两个海底滑坡体的主要因素。该地震震中位于NW-SE向苏北-滨海断裂带和E-W向栟茶河断裂带的交叉区,上述两个滑坡发生于这两个断裂带近震中处,且前一个断裂带(该地震的主破裂面)上诱发的滑坡体规模较大。本区海底上部普遍发育潮汐环境下形成的砂泥互层沉积,下部为古河道砂质沉积,加之潮道边坡坡度相对较大,震动触使含水砂层运动,出现"液化现象",造成边坡失稳而诱发上部地层发生错断,导致潮流通道两侧沙脊边坡出现滑坡。近年来,江苏海岸开发加速,工程建设加快,潜在滑坡以及浅层气、软基等地质灾害在辐射沙脊群海域相对密集,探明与查清滑坡体空间分布与发展趋势,对保障海岸重大工程建设安全具重要意义。Abstract: Three typical submarine landslides have been found in the two shallow seismic profiles across the middle Huangshayang tidal channel in the central part of the radial sand ridge field (RSRF), South Yellow Sea (SYS), which is 34.5 km northeastwards away from the Da-Yangkou, and 17.1 km northwards away from the West Taiyangsha artificial island, Rudong County. The largest one is located on the northern side of the tidal channel,that is,on the southern slope of the Jiangjiasha sand ridge. The main scarp is up to 15 m high and more than 300 m wide. The other two are located on the southern side of the tidal channel or the northern slope of the Qie'erganzi sand ridge. These two landslides are quite close to each other, and show similar shape. They should be the same landslide on medium scale. The sedimentary dynamics in the Huangshayang tidal channel have been relatively stable in recent several decades, and there are hardly any sediments covering on the top of the displacement of the landslides, it could be deduced that they might be the records of the Ms 6.2 earthquake happened in the SYS on May 21th,1985. The epicenter of this earthquake was located at the intersection zone between the NW-SE trend Subei-Binhai fault zone and E-W trend Bencha River fault zone. As these two fault zones are close to the epicenter, two landslides were induced, and the scale of the one happened at the main fracture zone of this earthquake, that is the prior one, was much larger. The upper part of submarine sediments in the RSRF was mainly composed of sandy-silty interbedded deposits formed in tidal environments, and the lower part was mainly fluvial sand deposits. Meanwhile, the slopes of the channels were relatively steep. Shaking was easily to induce the water-bearing sands to move, even to flow because of liquefaction. The slope became instable, and the upper part of sedimentary strata began to break. Consequently, the landslides happened on the both sides of the tidal channel along the slopes of the sand ridges. In recent years, the exploitation speed of the Jiangsu coast along the SYS is vastly improving and the coastal engineering constructions are developing rapidly. Hazardous geological factors, such as potential landslides, shallow gas and soft foundation, distribute densely in the RSRF. Therefore, it is important to investigate the spatial and temporal distribution and to understand the development trends of these hazardous geological factors in the whole RSRF, in order to guarantee the safety of the coastal engineering constructions.
-
-
[1] 叶银灿. 海洋灾害地质学发展的历史回顾及前景展望[J]. 海洋学研究, 2011, 29(4):1-7.
[YE Yincan. Review of the development of marine hazard geology and its future prospects[J]. Journal of Marine Sciences, 2011, 29(4):1-7.]
[2] 杨子赓, 张志珣, 王学言. 渤海湾北部浅海海洋地质环境演变与灾害地质问题[C]//陈颙, 王水, 秦蕴珊, 等. 寸丹集——庆贺刘光鼎院士工作50周年学术论文集. 北京:科学出版社, 1998:100-112.[YANG Zigeng, ZHANG Zhixun, WANG Xueyan. Marine geologic environmental evolution and hazardous geology of the shallow sea area in the north of the Bohai Bay[C]//CHEN Yong, WANG Shui, QIN Yunshan, et al. Cundan Collection:A Collection of Academic Papers for Celebrating the 50th Anniversary of Academician LIU Guangding's Work. Beijing:Science Press, 1998
:100-112.]
[3] 陈晓辉, 张训华, 李日辉, 等. 渤海海峡海域灾害地质研究[J]. 海洋地质与第四纪地质, 2014, 34(1):11-19.
[CHEN Xiaohui, ZHANG Xunhua, LI Rihui, et al. A preliminary study on hazardous geology in the Bohai Strait[J]. Marine Geology and Quaternary Geology, 2014, 34(1):11-19.]
[4] 李凡, 于建军, 姜秀珩, 等. 南黄海灾害性地质研究[J]. 海洋地质与第四纪地质, 1991, 11(4):11-23.
[LI Fan, YU Jianjun, JIANG Xiuhang, et al. Study on geohazard in the South Yellow Sea[J]. Marine Geology and Quaternary Geology, 1991, 11(4):11-23.]
[5] 李凡, 张秀荣, 唐宝珏, 等. 黄海埋藏古河道及灾害地质图集[M]. 济南:济南出版社, 1998:1-123.[LI Fan, ZHANG Xiurong, TANG Baojue, et al. Atlas of Yellow Sea Buried Paleo-channels and Geological Hazards[M]. Ji'nan:Ji'nan Press, 1998:1
-123.]
[6] 宋召军, 张志珣, 刘立. 南黄海海底灾害地质因素的识别[J]. 海洋地质动态, 2003, 19(4):8-11.
[SONG Zhaojun, ZHANG Zhixun, LIU Li. Identification of submarine hazardous geological factors in the South Yellow Sea[J]. Marine Geology Letters, 2003, 19(4):8-11.]
[7] 张志忠, 顾兆峰, 刘锡清, 等. 南黄海灾害地质及地质环境演变[J]. 海洋地质与第四纪地质, 2007, 27(5):15-22.
[ZHANG Zhizhong, GU Zhaofeng, LIU Xiqing, et al. Hazardous geology and marine geologic environmental evolution in the South Yellow Sea[J]. Marine Geology and Quaternary Geology, 2007, 27(5):15-22.]
[8] 李西双, 刘保华, 郑彦鹏, 等. 黄东海灾害地质类型及声学反射特征[J]. 青岛海洋大学学报:自然科学版, 2002, 32(1):107-114.
[LI Xishuang, LIU Baohua, ZHENG Yanpeng, et al. Types and acoustic reflection characteristics of geological hazards in Yellow Sea and East China Sea[J]. Journal of ocean University of Qingdao, 2002, 32(1):107-114.]
[9] 刘杜鹃, 潘国富, 叶银灿. 东海陆架典型海洋灾害地质因素及其声反射特征[J]. 海洋通报, 2010, 29(6):664-668.
[LIU Dujuan, PAN Guofu, YE Yincan. Types and acoustic reflection characteristics of geological hazard factors in the shelf of East China Sea[J]. Marine Science Bulletin, 2010, 29(6):664-668.]
[10] 李凡. 南海西部灾害性地质研究[J]. 海洋科学集刊, 1990, 31:25-49.[LI Fan. Study on hazard geology in west part of the northern South China Sea[J]. Studia Marina Sinica, 1990
, 31:25-49.]
[11] 陈俊仁, 李廷桓. 南海地质灾害类型与分布规律[J]. 地质学报, 1993, 67(1):76-85.
[CHEN Junren, LI Tinghuan. Types and distribution of geological hazards in the South China Sea[J]. Acta Geologica Sinica, 1993, 67(1):76-85.]
[12] 詹文欢, 刘以宣, 钟建强, 等. 南海南部活动断裂与灾害性地质初步研究[J]. 海洋地质与第四纪地质, 1995, 15(3):1-9.
[ZHAN Wenhuan, LIU Yixuan, ZHONG Jianqiang, et al. Preliminary analysis of the active faults and hazard geology in the south of the South China Sea[J]. Marine Geology and Quaternary Geology, 1995, 15(3):1-9.]
[13] 李培英, 杜军, 刘乐军, 等. 中国海岸带灾害地质特征及评价[M]. 北京:海洋出版社, 2007:53-64.[LI Peiying, DU Jun, LIU Lejun, et al. Characteristics and Evaluation of Hazard Geology in China's Coastal Zone[M]. Beijing:China Ocean Press, 2007:53
-64.]
[14] 王斌, 梁雪萍, 周健. 江苏及其周边地区断裂活动性与地震关系的分析[J]. 高原地震, 2008, 20(1):38-43.
[WANG Bin, LIANG Xueping, ZHOU Jian. Analysis on relationship between fault activity and earthquakes in Jiangsu Province and its adjacent areas[J]. Plateau Earthquake Research, 2008, 20(1):38-43.]
[15] 张光威. 南黄海陆架沙脊的形成与演变[J]. 海洋地质与第四纪地质, 1991, 11(2):25-35.
[ZHANG Guangwei. Formation and evolution of sand ridges in the South Huanghai Sea shelf[J]. Marine Geology and Quaternary Geology, 1991, 11(2):25-35.]
[16] 蔡明理, 马仲荃. 江苏辐射沙洲潮汐通道建港可行性初探-以黄沙洋为例[J]. 海岸工程, 1992, 11(3):34-42.
[CAI Mingli, MA Zhongquan. On the feasibility of port building in the areas of Jiangsu radial shoal using the tidal-channels-a case study of Huangshayang[J]. Coastal Engineering, 1992, 11(3):34-42.]
[17] 董佳, 马洪亮, 熊伟. 黄沙洋水道末梢浅水槽建港工程潮流数值模拟与泥沙淤积计算[J]. 水运工程, 2013(8):73-79.[DONG Jia, MA Hongliang, XIONG Wei. Tidal current numerical simulation and sediment deposition calculation of port construction in shallow water tank at the end of Huangshayang channel[J]. Port and Waterway Engineering, 2013
(8):73-79.]
[18] [19] 孙家振, 李兰斌. 地震地质综合解释教程[M]. 武汉:中国地质大学出版社, 2002:114-140.[SUN Jiazhen, LI Lanbin. Comprehensive Interpretation Course of Seismic Geology[M]. Wuhan:China University of Geosciences Press, 2002:114
-140.]
[20] 王颖. 黄海陆架辐射沙脊群[M]. 北京:中国环境科学出版社, 2002:360-367.[WANG Ying. Radiative Sandy Ridge Field on Continental Shelf of the Yellow Sea[M]. Beijing:China Environmental Science Press, 2002:360
-367.]
[21] 王颖. 中国区域海洋学-海洋地貌学[M]. 北京:海洋出版社, 2012:222-226.[WANG Ying. China Regional Oceanography-Marine Geomorphology[M]. Beijing:China Ocean Press, 2012:222
-226.]
[22] 南京大学海岸与海岛开发教育部重点实验室. 江苏省如东县人工岛工程烂沙洋水道稳定性研究报告[R]. 南京:南京大学海岸与海岛开发教育部重点实验室, 2003.[The Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University. Research Report of the Stability of the Lanshayang Tidal Channel for the Artificial Island Engineering in Rudong County, Jiangsu Province[R]. Nanjing:The Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, 2003.]
[23] 孙祝友. 南黄海辐射沙脊群主潮流通道烂沙洋沉积演化研究[D]. 南京:南京大学地理与海洋科学学院, 2012.[SUN Zhuyou. Research on Sedimentary Environment Evolution of Lanshayang Tidal Channel of Radial Sand Ridges, South Yellow Sea[D]. Nanjing:School of Geographic and Oceanographic Sciences, Nanjing University, 2012.]
[24] 夏非, 殷勇, 王强, 等. MIS 3晚期以来江苏中部海岸的层序地层[J]. 地质学报, 2012, 86(10):1696-1712.
[XIA Fei, YIN Yong, WANG Qiang, et al. Sequence stratigraphy of the central part of north Jiangsu coasts since Late MIS 3, Eastern China[J]. Acta Geologica Sinica, 2012, 86(10):1696-1712.]
[25] Xia F, Zhang Y Z, Wang Q, et al. Evolution of sedimentary environments of the middle Jiangsu coast, South Yellow Sea since late MIS 3[J]. Journal of Geographical Sciences, 2013, 23(5):883-914.
[26] 潘懋, 李铁峰. 灾害地质学[M]. 北京:北京大学出版社, 2002:7-9.[PAN Mao, LI Tiefeng. Hazard Geology[M]. Beijing:Peking University Press, 2002:7
-9.]
[27] Wang Y, Zhang Y Z, Zou X Q, et al. The sand ridge of the South Yellow Sea:Origin by river-sea interaction[J]. Marine Geology, 2011, 291-294:132-146.
[28] 江苏省地震局. 江苏地震志[M]. 北京:地震出版社, 1987:125-281.[Earthquake Administration of Jiangsu Province. Jiangsu Earthquake Chronicles[M]. Beijing:Seismological Press, 1987:125
-281.]
[29] 田建明, 徐徐, 谢华章, 等. 江苏及南黄海地区历史地震类型分布特征[J]. 地震学报, 2004, 26(4):432-439.
[TIAN Jianming, XU Xu, XIE Huazhang, et al. Distribution characteristics of historical earthquake classes in Jiangsu Province and South Huanghai Sea region[J]. Acta Seismologica Sinica, 2004, 26(4):432-439.]
[30] 中国地震局地质研究所. 江苏LNG工程场地地震安全性评价报告[R]. 北京:中国地震局地质研究所, 2005.[Institute of Geology, China Earthquake Administration. Report of Seismic Safety Evaluation of LNG Project Site, Jiangsu Province[R]. Beijing:Institute of Geology, China Earthquake Administration, 2005.]
[31] Kawamura K, Laberg J S, Kanamatsu T. Potential tsunamigenic submarine landslides in active margins[J]. Marine Geology, 2014, 356:44-49.
[32] Tappin D R, Watts P, Grilli S T. The Papua New Guinea tsunami of 17 July 1998:anatomy of a catastrophic event[J]. Natural Hazards and Earth System, 2008, 8(2):243-266.
[33] Fine I V, Rabinovich A B, Bornhold B D, et al. The Grand Banks landslide-generated tsunami of November 18, 1929:preliminary analysis and numerical modeling[J]. Marine Geology, 2005, 215(1-2):45-57.
-
计量
- 文章访问数: 1390
- PDF下载数: 10
- 施引文献: 0
下载: