山东半岛北部近海海域北西向蓬莱—威海断裂带的声波探测
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摘要
在山东半岛北部近海海域进行了多条剖面的声波探测,初步查明了蓬莱-威海断裂带的基本活动特征.该断裂带由一系列北西走向的次级断层组成,主体在长岛至大竹岛之间的海域,多数断层以正断兼有走滑运动为主,部分断层具有逆冲运动性质.断裂带在第四纪活动明显,以北东向桃村-东陡山断裂在海域的延伸段为界,蓬莱-威海断裂带可分为两段:长岛-烟台段和烟台-威海段.西段长岛-烟台段为晚更新世活动段,多数次级断层上断点埋深位于海底以下30m,明显错断了中更新世地层,部分断层明显错断了晚更新世早期地层,有些断层达到晚更新世地层中部,但没有发现全新世地层错动现象.东段烟台-威海段为中更新世活动段,没有发现晚更新世地层错断现象.蓬莱-威海断裂带对历史地震和现代小震活动具有明显控制作用,其中1548年7级地震发生于断裂带西段,1948年6级地震发生于断裂带东段.蓬莱-威海断裂带与北东向断裂交汇区是中强地震发生的有利部位.
Shallow-depth sonic reflection profiling survey has been conducted on the offshore of the north of the Shandong peninsula,and the late Quaternary offset features of the Penglai-Weihai fault zone are documented from more than ten shallow profiles.The fault zone passes through the offshore between the Changdong islands and the Dazhudao island,and consists of a group of NW trending faults,which are dominated by normal and reverse slips with strike-slip component.The Penglai-Weihai fault zone is characterized by the obvious Quaternary activity,which can be divided by the Taocun-Dongdoushan fault in the North Yellow Sea into two segments,the Changdao-Yantai segment and the Yantai-Weihai segment from east to west,respectively.The western Changdao-Yantai segment is a late Pleistocene active segment,where the uppermost fault points discovered in the the survey are buried at more than 30m bellow the sea bottom,and offset the early to middle late Pleistocene sedimentary layers,and no Holocene offset has been found.The eastern Yantai-Weihai segment is a mid Pleistocene segment on which no late Pleistocene offset has been found.The Penglai-Weihai fault zone is closely related to the occurrence of history strong earthquakes and modern small earthquakes,among them the 1548 Bohai strait M-S7 earthquake occurred on its western segment and the 1948 Weihai M-S6 earthquake on its east segment.The intersection regions of the Penglai-Weihai fault zone with NE striking fault zones are considered to be the likely places for the future medium to strong earthquakes.
Shallow-depth sonic reflection profiling survey has been conducted on the offshore of the north of the Shandong peninsula,and the late Quaternary offset features of the Penglai-Weihai fault zone are documented from more than ten shallow profiles.The fault zone passes through the offshore between the Changdong islands and the Dazhudao island,and consists of a group of NW trending faults,which are dominated by normal and reverse slips with strike-slip component.The Penglai-Weihai fault zone is characterized by the obvious Quaternary activity,which can be divided by the Taocun-Dongdoushan fault in the North Yellow Sea into two segments,the Changdao-Yantai segment and the Yantai-Weihai segment from east to west,respectively.The western Changdao-Yantai segment is a late Pleistocene active segment,where the uppermost fault points discovered in the the survey are buried at more than 30m bellow the sea bottom,and offset the early to middle late Pleistocene sedimentary layers,and no Holocene offset has been found.The eastern Yantai-Weihai segment is a mid Pleistocene segment on which no late Pleistocene offset has been found.The Penglai-Weihai fault zone is closely related to the occurrence of history strong earthquakes and modern small earthquakes,among them the 1548 Bohai strait M-S7 earthquake occurred on its western segment and the 1948 Weihai M-S6 earthquake on its east segment.The intersection regions of the Penglai-Weihai fault zone with NE striking fault zones are considered to be the likely places for the future medium to strong earthquakes.
引文
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[18]丁国瑜,卢演俦.华北地区地块新构造变形基本特征的讨论.华北地震科学,1983,1(2):1~9Ding G Y,Lu Y C.Discussions on the basic neotectonic features innorth China.North China Earthquake Sciences(in Chinese),1983.1(2):1~9
[19]张培震,王琪,马宗晋.中国大陆现今构造运动的GPS速度场与活动地块.地学前缘,2002,9(2):430~441Zhang P Z,Wang Q,Ma Z J.GPS database and velocity field ofcontemporary tectonic movement in continental China.Earth ScienceFrontiers(in Chinese),2002,9(2):430~441
[20]李培英.庙岛群岛的晚新生界与环境变迁.海洋地质与第四纪地质,1987,7(4):111~121Li P Y.The late Cenozoic erathem and environment variation in theMiaodao islands.Marine Geology&Quaternary Geology(inChinese),1987,7(4):111~121
[2]徐杰,宋长青,楚全芝.张家口-蓬莱断裂带地震构造特征的初步探讨.地震地质,1998,20(2):146~154Xu J,Song C Q,Chu Q Z.Preliminary study on the seismotectoniccharacters of the Zhangjiakou-Penglai fault zone.Seismology andGeology(in Chinese),1998,20(2):146~154
[3]侯贵廷,叶良新,杜庆娥.渤张断裂带的构造机制及其地质意义.地质科学,1999,34(3):375~380Hou G T,Ye L X,Du Q E.Tectonic mechanism and geologicalsignificance of the Bozhang fault zone.Scientia Geologica Sinica(inChinese),1999,34(3):375~380
[4]晁洪太,于慎鄂,李家灵等.山东半岛地区活断层研究.东北地震研究,2001,17(4):1~8Chao H T,Yu S E,Li J L,et al.Research on active faults in theShandong peninsula.Seismological Research of Northeast China(inChinese),2001,17(4):1~8
[5]王揆洋,郑彦鹏,王述功.声学探测技术在近岸水域地震地层探测中的应用.海洋地质与第四纪地质,1999,19(4):97~101Wang K Y,Zheng Y P,Wang S G.Application of acoustictechnology to seismo-stratigraphy surveying in offshore.MarineGeology&Quaternary Geology(in Chinese),1999,19(4):97~101
[6]吴自银,金翔龙,李家彪.中更新世以来长江口至冲绳海槽高分辨率地震地层学研究.海洋地质与第四纪地质,2002,22(2):9~20Wu Z Y,Jin X L,Li J B.Seismic stratigraphic interpretation ofhigh-resolution seismic profiles between Yangtze estuary and Okinawatrough.Marine Geology&Quaternary Geology(in Chinese),2002,22(2):9~20
[7]Liu J P,Milliman J D,Gao S,et al.Holocene development of theYellow River’s subaqueous delta,North Yellow Sea.MarineGeology,2004,209:45~67
[8]中田高,岛崎邦彦.海底の地震の巢を探る.科学,1993,63(9):593~599Nakada T,Shimazaki K.Prospecting of submarine seismogenicstructures(in Japanese).Science in Japan,1993,63(9):593~599
[9]中田高.海底活断层の古地震学的研究.岛崎邦彦,太田阳子编.古地震を探る.古今书院,1995.168~192Nakada T.Researches on submarine active faults andpalaeoearthquakes(in Japanese).In:Shimazaki K,Oda Y eds.Researches on Palaeoearthquakes.National Press,1995.168~192
[10]夏东兴,刘振夏,王揆洋等.渤海东部更新世末期以来的沉积环境.海洋学报,1995,17(2):86~92Xia D X,Liu Z X,Wang K Y,et al.Sedimentary environment inthe east of Bohai since the end of the Pleistocene.Acta OceanologicaSinica(in Chinese),1995,17(2):86~92
[11]程鹏,高抒.北黄海西部全新统分布的初步认识.第四纪研究,2001,21(4):379Cheng P,Gao S.Preliminary research on the Holocene series in thewest of the North Huanghai sea.Quaternary Research(in Chinese),2001,21(4):379
[12]王桂芝,高抒,李凤业.北黄海西部的全新世泥质沉积.海洋学报,2003,25(4):125~134Wang G Z,Gao S,Li F Y.Holocene mud deposits in the west ofnorth Huanghai sea.Acta Oceanologica Sinica(in Chinese),2003,25(4):125~134
[13]周翠英,华爱军,蒋海昆等.以格点尝试法求取的山东地区现代中小地震震源机制解.东北地震研究,2003,19(1):1~11Zhou C Y,Hua A J,Jiang H K,et al.Focal mechanism solutionsobtained by grid points test method for contemporary moderate andsmall earthquakes in Shandong area.Seismological Research ofNortheast China(in Chinese),2003,19(1):1~11
[14]蔡克明.威海市区地震地质研究.地震地质,1994,16(1):39~42Cai K M.Seismogeological research in Weihai city.Seismology andGeology(in Chinese),1994,16(1):39~42
[15]邓起东,闵伟,晁洪太等.渤海地区新生代构造与地震活动.见:新构造与环境.北京:地震出版社,2001.218~233Deng Q D,Min W,Chao H T,et al.Cenozoic tectonic andseismologic activities in Bohai Sea.In:Neotectonics and Environment(in Chinese).Beijing:Seismological Press,2001.218~233
[16]Hu S B,Sullivian P B,Raza A,et al.Thermal history and tectonicsubsidence of the Bohai Basin,Northern China:a Cenozoic rifted andlocal pull-apart basin.Physics of the Earth and Planetary Interiors,2001,126:221~235
[17]李祥根.京津及河北平原的最新活动构造带.见:中国活动断裂,北京:地质出版社,1982.44~50Li X G.Latest active structural belt in Beijing,Tianjin and Hebeiplain.In:Active Faults in China(in Chinese),Beijing:GeologicalPublishing House,1982.44~50
[18]丁国瑜,卢演俦.华北地区地块新构造变形基本特征的讨论.华北地震科学,1983,1(2):1~9Ding G Y,Lu Y C.Discussions on the basic neotectonic features innorth China.North China Earthquake Sciences(in Chinese),1983.1(2):1~9
[19]张培震,王琪,马宗晋.中国大陆现今构造运动的GPS速度场与活动地块.地学前缘,2002,9(2):430~441Zhang P Z,Wang Q,Ma Z J.GPS database and velocity field ofcontemporary tectonic movement in continental China.Earth ScienceFrontiers(in Chinese),2002,9(2):430~441
[20]李培英.庙岛群岛的晚新生界与环境变迁.海洋地质与第四纪地质,1987,7(4):111~121Li P Y.The late Cenozoic erathem and environment variation in theMiaodao islands.Marine Geology&Quaternary Geology(inChinese),1987,7(4):111~121
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