张家口断裂第四纪构造变形与活动性研究

本文根据野外详实资料对张家口断裂的构造变形和活动性进行分析与研究,结果表明:断裂由西、中、东3段组成,各段多由北西向和近东西向2组多条次级断层组成,总体呈北西西走向展布,长达70km,控制着张家口及附近的第四纪构造演化和地貌发育;北西向断层构成断裂的主体,为高角度的逆(或正)走滑断层,近东西向断层较短,表现为正倾滑,第四纪期间2组断层持续活动,以脆性变形为特征;断裂端部段落与北东向断裂交汇,活动性较弱,构造表现不甚清楚,中部段落活动强烈,晚更新世以来单条断层的平均垂直活动速率大于0.07—0.30mm/a,总的垂直活动速率可能达到1.33mm/a。     

张家口断裂发现第四纪晚期活动证据

作者等人在“河北省城市活断层探测与地震危险性评价（张家口项目）”2008年探测工作中对张家口断裂进行了地质调查,多处发现了清楚的第四纪晚期（晚更新世-全新世）断层活动剖面,获得了张家口断裂晚第四纪活动的可靠证据,为张家口市活断层探测打下了坚实基础。     

山西长治断裂的基本特征与第四纪活动性研究

实地调查表明,山西长治断裂由三段组成,南段和中段为西倾正断层,北段为东倾正断层,总体走向北东25o,长达65km,控制着附近山地与第四纪山间盆地的构造演化和地貌发育;第四纪早期,断裂发生强烈的垂直差异活动,最大垂直活动幅度可达400m左右;第四纪晚期,断裂活动性明显减弱,中段仍有活动,至少发生过两期活动,第—期活动发生于距今10.88万年左右或以后、1.49万年以前,第二期活动发生于距今1.49万年以后,垂直错距0.65m。     

聊城-兰考隐伏断裂的第四纪活动性——中国东部平原区一条重要的隐伏活动断裂

在化探定位的基础上,通过浅层地震勘探、钻探地质剖面和新地层年代学等多手段探测研究,首次查明了聊考隐伏断裂晚第四纪以来的位错量和最新一期活动时代,厘定了断裂位错上断点达地表20m以下,最新一期活动在全新世早期,属浅埋的隐伏活动断裂。断裂第四纪以来的平均位错速率为0．12mm／a,在中国东部属中等倔强的一类隐伏活动断裂。     

Activity Features and Slip Rate of the Lingwu Fault in Late Quaternary

The I ingwu fault is in the eastern boundary of the southern section of Yinchuan graben. It hasa close relation to seismicity in the Lingwu-Wuzhong region.Few researches have been done.In this Paper,on the basis of tee data obtained from field investigation,the activity features inLate Quaternary have been discussed.The vertical displacement and its slip rate have been alsoestimated.The fault is 48km in length,being divided into 3 segments according to geologicaland topographical characteristics.The last rupture along its northern and middle segments wasoccurred in late of Late Pleistocene or early Holocene while that along the southern segmentwas occurred in midle Holocene.The vertical slip rate is estimated as 0.23～025mm/a sinceabout 66ka B.P.based on the vertical displacements of terracesⅠ,Ⅱ and Ⅲ and their ages.     

深圳市横岗-罗湖断裂第四纪活动性研究

本文在前人研究的基础上,采用地质地貌调查、联合钻孔探测及地质年代测定等技术方法,对深圳横岗-罗湖断裂的第四纪活动性进行了详细考察与综合研究。结果表明：横岗-罗湖断裂最新一次活动发生在中更新世,自晚更新世中期以来没有新的活动证据。     

The Activity of Liaocheng-Lankao Buried Fault During the Quaternary——An Important Buried Active Fault in the Eastern China Plain

On the basis of locating by the geochemical prospecting,shallow seismic sounding,drilling,geological profiling,and neogeochronological dating,we first found out the dislocation amount along the Liaocheng-Lankao buried fault since the Quaternary and the age of its latest activity phase and determined that the upper break point by the fault dislocation reaches 20m below the surface,The latest activity phase was in the early Holocene and the Fault is a shallow-buried active fault.An average dislocation rate along the fault is 0.12mm/a since the Quaternary.Thus,it is a buried active fault with intermediate to strong movement strength in the eastern china.     

郯庐断裂带江苏段东地堑边界断层第四纪活动性

郯庐断裂带东地堑边界断层在断裂带演化过程和现今构造格局中都是重要断层,对该边界断层的第四纪活动性研究有助于了解郯庐断裂带的演化历史和地震活动性,而有关该边界断层第四纪活动性研究较少且至今尚无定论。本文通过浅层地震勘探和钻孔联合剖面相结合的方法,针对郯庐断裂带江苏段东地堑两边界断层开展系统的断层第四纪活动性研究,结果显示,昌邑-大店断裂(F_1)第四纪以来未见构造运动证据,白芬子-浮来山断裂(F_2)在第四纪早期曾发生有关活动,晚更新世以来未见活动迹象。     

青岛沧口断裂的地质构造特征与第四纪活动性研究

本文根据青岛市活断层探测与地震危险性评价项目初查阶段第四纪地层分析、遥感影像解译、地球化学探测、地质地貌调查与探槽开挖、浅层地震勘探与钻孔探测、地质年代测定等获得的丰富的第一手资料,对青岛沧口断裂的地质构造特征和第四纪活动性进行了详细分析与综合研究,结果表明:沧口断裂经历多期构造变动,是本区的重要断裂之一,它由多支断层组成,控制了中生代的火山活动、盆地沉积和岩浆侵入以及晚第四纪的盆地沉积、山体隆升和水系发育;第四纪以来,沧口断裂的主要活动发生于中更新世晚期至晚更新世早期,表现出中高角度向南东倾的逆冲活动特点,错断了上更新统底面1—6m,而最新活动时代为晚更新世中期,以走滑活动为主,垂直错距0.2—1.1m。     

兰州马衔山北缘断裂中段晚第四纪活动的新证据

马衔山北缘断裂为兰州市区南侧一条规模较大的区域性活动断裂带,总体走向N60°W,长约115 km.该断裂大致可划分为4条次级断裂段,自东向西分别为内官营段、马衔山段、七道梁段和雾宿山段.其中,内官营段为晚更新世活动段,雾宿山段为全新世活动段并为1125年兰州7级地震的发震断裂,而中间的马衔山段和七道梁段以往研究所获得的新活动证据不多,认识不统一.近期经过详细的追踪考察,获得了马衔山段和七道梁段晚第四纪活动的新证据,结合该区多次历史地震的活动特征,表明其为晚第四纪活动断裂,具左旋走滑兼倾滑运动特征.     

盘谷寺-新乡断裂第四纪活动性分段特征

盘谷寺-新乡断裂以柏山、高村为界,分为西、中、东3段,根据物探剖面、地质标准孔和地层剖面出露特征,各段活动性具有明显差异。其中西段最新活动时代为中更新世,具有向盆地迁移发育的特征;中段最新活动时代为晚更新世早期;东段活动性稍复杂,经历了正断-逆冲-正断的运动过程演变,其最新活动时代为晚更新世早期,且活动强度向两端减弱。高村所处的武陟隆起区推测为盘谷寺-新乡断裂中、东段的挤压阶区,断层位移在此处有亏损和衰减。     

鄂尔多斯北缘断裂托克托段晚第四纪活动特征

鄂尔多斯北缘断裂作为河套断陷带和鄂尔多斯地块的边界断裂,研究其晚第四纪活动特征,对于科学评价黄河流域内蒙古河套段的地震危险性具有重要意义。本文利用野外地质调查、微地貌测量、浅层人工地震勘探及钻孔联合剖面探测相结合的方法,综合地层年代样品测试结果,确定了该断裂托克托段的准确位置和最新活动特征。研究结果表明,鄂尔多斯北缘断裂托克托段沿线构造地貌不发育,推测断裂的最新活动可能尚未达到地表,地表的地貌陡坎应为河流侵蚀成因。断裂在深、浅地震反射剖面上表现为“Ｙ”字形的张性断裂系,主断裂倾向北,分支断裂倾向南,整体上陡下缓,具有多个地堑式分布的特点。跨断裂钻孔联合剖面上显示,单个分支断裂的同震垂直位移量为2～2.5 m,最新活动时代为43.5～70 ka。鄂尔多斯北缘断裂是一条晚更新世活动的深大断裂,具有一定的地震危险性。     

内蒙古乌海断陷岗德尔山西麓断裂晚第四纪特征分析

岗德尔山西麓断裂是乌海断陷的一条控盆边界断裂。通过野外地质调查、构造剖面解析结合浅层物探、地球化学探测,综合对断裂的第四纪活动特征进行分析和研究。结果显示,岗德尔山西麓断裂整体走向NNE,倾角60°~80°,具有成束成带发育特点,是一条全新世活动断裂,表现出以拉张为主的活动特征。     

郯庐断裂带新沂－五河段晚第四纪活动的新证据

The Tancheng-Lujiang fault zone has great influence in eastern China. Studies have shown obvious signs of neotectonic activities on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone. In this study, on the basis of the previous work, many seismological surveys are made along the Tancheng-Lujiang fault zone and trenches are excavated in key sites. Combined with the analysis of the seismic activities along the fault, the fault movement features and future seismic risk are discussed. Much first-hand information obtained in the paper can provide an important reference value for the study of large earthquake recurrence rules and the mid and long-term earthquake prediction on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone.     

Late Quaternary Activity and Paleoearthquakes along the Nanyukou Segment of the Northern Piedmont Fault of Wutai Mountain

The northern piedmont fault of Wutai Mountain is located at the north of the Shanxi Graben system,which is the dominating fault of the south boundary of the Fanshi-Daixian depression. This paper discusses the fault activity and paleoearthquakes around the Nanyukou segment of the northern piedmont fault of Wutai Mountain during the late Quaternary through field investigation along the fault,measuring geomorphic deformation and excavating trenches at some important sites. From Nanyukou to the southwest of Shanhui,we find obviously dislocated alluvial fans,with strong neotectonic movement at these sites. Since nearly 20ka,the vertical average slip rate is 1. 55mm /a to 2. 0mm /a. However,since nearly 6ka,it has reached as high as 2. 3mm /a,which is twice that on other segments. 2 trenches were excavated around Nanyukou with 6 events discovered. The referenced ages of the events are before 7600a,6700a ～ 7600a,5321a ～ 5575a,4400a ～ 5400a,4200a ～ 4400a and after 1600a B. P. with approximate recurrence interval 1400a. The latest event is likely to be the earthquake occurring at 512 A. D. ,so it is necessary to do further work to verify this in the future.     

豫西三门峡地区温塘断裂第四纪活动性研究

温塘断裂位于鄂尔多斯块体东南缘,是三门峡盆地的东边界控制断裂,准确厘定其活动性对于理解区域构造演化和判断三门峡地区地震危险性具有重要意义。运用野外地质地貌调查、联合钻孔剖面探测及光释光定年技术,对三门峡地区温塘断裂的活动性进行分析与研究。结果表明,温塘断裂南段出露地表,线性特征明显,断层最新活动时代为晚更新世;温塘断裂中段为第四纪隐伏断裂,断层活动时代为中更新世;温塘断裂北段断层出露,断层活动时代为中更新世。     

五台山北麓断裂繁峙段晚第四纪活动性研究

五台山北麓断裂位于山西地堑系北部。本文以五台山北麓断裂繁峙段的地质地貌为研究对象,分别在繁峙县的大峪村和岗里村两地断裂沿线进行了无人机测量。利用三维结构的运动重建技术(Structure from Motion,SfM)进行影像数据处理,得到高精度点云数据,并通过进一步处理获得了分辨率达0.5m的高清断错地貌正射影像(DOM)和数字高程模型(DEM)。通过对典型地区的详细野外调查和挖掘探槽等手段对该段晚第四纪的活动性进行研究,发现断层晚第四纪以来的活动主要是以正倾滑运动为主。同时在五台山北麓断裂沿线的大峪村、岗里村等地进行了断错地貌分析和晚第四纪滑动速率计算,得到约20ka以来的断层垂向滑动速率为0.4—0.6mm/a,近18ka以来该段发生过至少两次古地震事件。古地震事件和滑动速率分析表明,五台山北麓断裂晚第四纪,尤其是全新世以来活动强烈,且不同段落存在明显的活动性差异。     

New Activity of the Tanlu Fault Zone in the South of Huaihe to the Nvshanhu Segment since the Late Quaternary

Taking the Huaihe to the Nvshanhu segment of the Tanlu (Tancheng-Lujiang) fault zone as the main research target to explore whether there has been new activity since the late Quaternary, and based on the interpretation of remote sensing images and repeated surface investigations, we excavated trenches at the sections where the tectonic landform is significant, identified and recorded the deformation patterns of the fault and analyzed the activity behavior. Samples of new activity and deformation were collected and oriented slices were ground based on the samples'' original state to make the micro structural analysis and demonstration. All of the above research shows very clear linear tectonic geomorphology along the fault, three trenches across the fault zone all revealed new deformation traces since late Quaternary. The latest stratum dislocated by the fault is the late Quaternary and Holocene. The main slip mode is stick slip, as represented typically by fault scarps, wedge accumulation, the faults and the filled cracks and so on. In general, it shows the characteristics of brittle high-speed deformation and belongs to the prehistoric earthquake ruins. The above understanding was confirmed partially by microscopic analysis. In addition, the similarities and differences and the possible reasons for the characteristics of the latest activities of the Tancheng-Lujiang fault zone in the north and south of the Huaihe River regions are also discussed in this paper.     

开封断裂第四纪活动特征

开封断裂是郑州-开封断裂带的重要组成部分,也是黄河中下游平原的一条重要控制性断裂。利用浅层地震勘探发现,开封断裂为总体走向EW,倾向N的正断层;断裂分为东、西2支,断裂活动性具有明显的分段特征,东支活动性较西支强。钻孔联合剖面揭示开封断裂东支断裂上断点埋深27～35 m,根据地层年代学结果,其最新活动时间为晚更新世。研究成果为开封市城乡规划、重大工程选址和地震区划工作提供了重要的基础数据。