台湾海峡滨海断裂带的构造特征与活动性
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摘要
根据台湾海峡滨海断裂带活动断裂调查得到的海底地形、重力、地磁和多道地震探测资料,对滨海断裂带的构造特征与活动性进行了研究。该断裂带总体呈NE向分布,东北端起自牛山岛以东海域,西南端止于兄弟屿以东海域,大体沿50～60m等深线展布,全长约500km,是华南大陆与台湾海峡海盆的分界断裂;断层面近于直立,切穿地壳;在主压应力轴为NWWSEE方向的应力场作用下,断裂以右旋走滑为主,兼逆冲性质;断裂带两侧地形反差大,最新活动性强,控制着两侧新生代地层的沉积,;断裂带上地震活动频繁,是福建沿海地震活动最活跃的断裂带。
With the data of bottom topography,gravity,geomagnetism measurements and multichannel seismic detection, which the tectonic features and activity of the Binhai faults in Taiwan strait are obtained from fault investigations,are studied. The results show that the fault extends generally in the NE direction,whose NE end starts from the sea area to the east of Niushan island and its SW end is in the sea area of the eastern Xiongdi islet.With a total length of 500 km,it is a boundary fault between the South China continent and the sea basin of Taiwan Strait,which stretches out roughly along the isobath of 50-60 m.Its fault plane is almost upright and cuts through the crust.Under the action of the stress field with a principle compressive stress axis of NWW-SEE,the fault is predominated by right-lateral strike slip and it also has an obduction feature.With a sharp contrast of terrains on both sides,it is a recently active fault to control the differential sedmentation of Cenozoic stratum on both of its sides.The seismic activities on this fault are frequent and it is a fault zone with the most active seismicity in the Fujian coastal region.
With the data of bottom topography,gravity,geomagnetism measurements and multichannel seismic detection, which the tectonic features and activity of the Binhai faults in Taiwan strait are obtained from fault investigations,are studied. The results show that the fault extends generally in the NE direction,whose NE end starts from the sea area to the east of Niushan island and its SW end is in the sea area of the eastern Xiongdi islet.With a total length of 500 km,it is a boundary fault between the South China continent and the sea basin of Taiwan Strait,which stretches out roughly along the isobath of 50-60 m.Its fault plane is almost upright and cuts through the crust.Under the action of the stress field with a principle compressive stress axis of NWW-SEE,the fault is predominated by right-lateral strike slip and it also has an obduction feature.With a sharp contrast of terrains on both sides,it is a recently active fault to control the differential sedmentation of Cenozoic stratum on both of its sides.The seismic activities on this fault are frequent and it is a fault zone with the most active seismicity in the Fujian coastal region.
引文
① 中国地震局地球物理研究所工程院,福建地震地质工程勘察院.福建连江核电厂初步可行性研究阶段地震调查及评价工作报告,2005.
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8郭逢英,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87～92.8GuoFengying,etal.CrustaldeformationalongcoastofFujianrevealedbyGPS[J].JournalofGeodesyandGeodynamics,2003,23(3):87-92.(inChinese)
9丁学仁,等.福建地区地块运动时空变化特征研究[J].大地测量与地球动力学,2006,26(2):58～61.9DingXueren,etal.StudyonspacetimevariationcharacteristicsofcrustalmovementoftectonicblocksinFujianarea[J].JournalofGeodesyandGeodynamics,2006,26(2):58-61.(inChinese)
10李延兴,胡新康,李智,等.台海地区的地壳运动与变形[J].地震学报,2002,24(5):487～495.10LiYanxing,HuXinkang,LiZhi,etal.CrustalMovementanddeformationinTaiwananditscoastalarea[J].ActaSeismologicaSinica,2002,24(5):487-495.(inChinese)
11李延兴,等.台湾集集7.6级地震前后福建沿海地区的地壳运动[J].大地测量与地球动力学,2006,26(2):5～9.11LiYanxing,etal.CrustalmovementincoastalareaofFujianbeforeandafterM7.6ChiChiearthquake[J].JournalofGeodesyandGeodynamics,2006,26(2):5-9.(inChinese)
1丁祥焕,等.福建东南沿海活动断裂与地震[M].福州:福建科学技术出版社,1999.1DingXianghuan,etal.ActivefaultzonesandearthquakesalongthesoutheastofFujianprovince[M].Fuzhou:FujianScientificandTechnologicalPublishingHouse,1999.(inChinese)
2陈园田,等.台湾海峡及两岸发震断裂的对比研究[J].地壳形变与地震,2001,21(4):67～75.2ChenYuantian,etal.ContrastiveresearchontheseismicfaultinTaiwanstraitandbothitscoasts[J].CrustalDeformationandEarthquake,2001,21(4):67-75.(inChinese)
3陈园田,等.福建沿海的断陷盆地、平原、海湾与地震[J].地壳形变与地震,1998,18(4):55～61.3ChenYuantian,etal.Downfaultedbasin,plain,bayandearthquakesofcoasatlandinFujianprovince[J].CrustalDeformationandEarthquake,1998,18(4):55-61.(inChinese)
4赵明辉,丘学林,叶春明,等.南海东北部海陆深地震联测与滨海断裂带两侧地壳结构分析[J].地球物理学报,2004,47(5):845～852.4ZhaoMinghui,QiuXuelin,YeChunming,etal.AnalysisondeepcrustalstructurealongtheonshoreoffshoreseismicprofileacrosstheBinhaifaultzoneinthenortheasternpartofSouthChina[J].ChineseJournalofGeophysics,2004,47(5):845-852.(inchinese)
5刘以宣.南澳断裂带与滨海断裂带的基本特征及其活动性探讨[J].华南地震,1986,6(3):1～8.5LiuYixuan.ApproachofbasiccharacteristicsofNan’aoandBinhaifaultzonesandtheiractivities[J].EarthquakeResearchinSouthChina,1986,6(3):1-8.(inChinese)
6黄玮琼,等.中国大陆地震资料完整性研究[J].地震学报,1994,16:274～280.6HuangWeiqiong,etal.ResearchonthecompletenessofearthquakedataabouttheChinesemainland[J].ActaSeismologicaSinica,1994,16(3):274-280.(inChinese)
7史粦华.福建及邻区现今地壳运动与形变[J].大地测量与地球动力学,2005,25(3):69～74.7ShiLinhua.PresentdaycrustalmovementanddeformationinFujianprovinceandadjacentarea[J].JournalofGeodesyandGeodynamics,2005,25(3):69-74.(inChinese)
8郭逢英,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87～92.8GuoFengying,etal.CrustaldeformationalongcoastofFujianrevealedbyGPS[J].JournalofGeodesyandGeodynamics,2003,23(3):87-92.(inChinese)
9丁学仁,等.福建地区地块运动时空变化特征研究[J].大地测量与地球动力学,2006,26(2):58～61.9DingXueren,etal.StudyonspacetimevariationcharacteristicsofcrustalmovementoftectonicblocksinFujianarea[J].JournalofGeodesyandGeodynamics,2006,26(2):58-61.(inChinese)
10李延兴,胡新康,李智,等.台海地区的地壳运动与变形[J].地震学报,2002,24(5):487～495.10LiYanxing,HuXinkang,LiZhi,etal.CrustalMovementanddeformationinTaiwananditscoastalarea[J].ActaSeismologicaSinica,2002,24(5):487-495.(inChinese)
11李延兴,等.台湾集集7.6级地震前后福建沿海地区的地壳运动[J].大地测量与地球动力学,2006,26(2):5～9.11LiYanxing,etal.CrustalmovementincoastalareaofFujianbeforeandafterM7.6ChiChiearthquake[J].JournalofGeodesyandGeodynamics,2006,26(2):5-9.(inChinese)
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