第四纪水泉尖山-崛峿山南麓断裂带活动的迁移及其机制

位于甘肃靖远地区的水泉尖山-崛峿山南麓断裂带早第四纪前为走向逆断 层,第四纪中期出现左旋走滑迹象。研究结果表明,水泉尖山-崛峿山南麓断裂带断裂 活动的横向迁移与海原活动断裂带的形成和强烈活动有着密切的关系。     

第四纪水泉尖山-崛山吴山南麓断裂带活动的迁移及其机制

位于甘肃靖远地区的水泉尖山-崛山吴山南麓断裂带早第四纪前为走向逆断层,第四纪中期出现左旋走滑迹象.研究结果表明,水泉尖山-崛山吴山南麓断裂带断裂活动的横向迁移与海原活动断裂带的形成和强烈活动有着密切的关系.     

太行山南缘断裂带新构造活动及其区域运动学意义

基于TM遥感影像的构造地貌解译和野外活动断层滑动矢量的测量和分析 ,阐述了太行山南缘断裂带第四纪左旋走滑活动的构造和地貌标志 ,反演了断裂变形的构造应力场 ,探讨了太行山南缘断裂带左旋走滑活动的区域运动学意义。研究表明 ,第四纪时期太行山南缘断裂带是一条斜张左旋走滑断裂。断层滑动矢量观测显示新近纪以来有 2期引张应力作用 :早期为NE -SW向引张 ,晚期为NNW -SSE向引张 ,这个观测结果与渭河地堑盆地的新近纪—第四纪 2期引张构造应力场一致。根据华北盆地构造资料推断 ,太行山南缘断裂带向东延伸与盆地内的泌阳 -开封 -商丘断陷带相接 ,共同构成了南华北和北华北 2个断陷区的构造边界。指出该断裂带作为南华北块体北缘 ,其新构造时期的斜张左旋走滑活动与南部秦岭断裂系左旋走滑活动一致 ,它们组成了一个宽阔的、向东撒开的、弥散型分布的左旋走滑形变带 ,调节着华南地块相对于华北地块向SEE方向的构造挤出     

珠江三角洲五桂山南麓断裂第四纪活动新知

野外工作期间 ,在珠江三角洲五桂山南麓发现两个切割第四系的断层剖面。这是首次在珠江三角洲地区见到的断裂第四纪活动的直接地质证据。对两个剖面作了详细介绍 ,并通过三角洲第四系的分析和对比 ,确认五桂山南麓断裂在中、晚更新世时期是活动的     

地震韵律研究方法初探--以郯庐断裂带龙泉山西麓剖面研究为例

通过对郯庐断裂带龙泉山西麓剖面的精细观测,样品微观和超微观测试,断层物质活动时代测定和综合分析研究,发现断裂带在第四纪曾有过多次活动（其中晚更新世以来也曾有过活动）,并呈现粘蠕滑交替的变形特征,其最新活动方式以蠕滑活动为主,这些结论修正了前人对郯庐断裂带南段的基本认识,丰富和深化了该断裂新活动的研究内容。     

长乐—诏安断裂带活动特征与继承性活动

对长乐－诏安断裂带的新、老断裂构造不同时期的活动规律及地震活动特征进行了分析,结果表明,该断裂在晚第四纪时期以继承性活动为特征,并表现出南强北弱的特点。     

张北6.2级地震小震活动特征

根据１９９３－１９９８京西北地区ＭＬ≥１．０级地震活动分析研究得出：张北６．２级地震发生在东西向第四纪继裂带与万全断裂带的复合部位上,震前万全断裂带和紫荆关断裂带近年来地震活动频繁,并且在万全断裂带上有明显的地震由北向南再由南向北的迁移活动。１９９３年以后波速比,孕震空间,地震迁移等可供分析的前兆信息很丰富。     

宜昌附近第四纪断层研究的新进展

通过野外地震地质调查，发现（１）北东向新场－古老背断裂带的地表形迹和更新世多期活动的地层、构造岩证据；（２）近南北向虎牙第四纪断层及其粘滑快速断错的剩余形变特征；（３）北西向天阳坪断裂带南支早第四纪粘滑块速断错的剩余形变特征及其上覆晚新世末期堆积未受断错所揭示的时间上限约束。     

乌鲁木齐市雅玛里克断裂特征与最新活动时代问题

乌鲁木齐市雅玛里克断裂是博格达弧形构造第二排断裂的西翼尾段部分.断裂从乌鲁木齐市中部通过,基本由两条断层构成,断裂构造地貌明显,断裂带的宽度可达百余米.通过该断裂错动第四纪地层和变动地貌面的反复勘察,大量断层地质剖面的观察,与断层活动相关的第四纪堆积物的年代测定,经分析认为雅玛里克断裂最新活动时代具有"西老东新"空间变化特点.断裂活动时代大体分为3段:葛家沟以西至雅玛里克山西北麓,为中更新世晚期活动;葛家沟以东到铁厂沟,为晚更新世活动;铁厂沟以东为全新世活动.     

福建漳州盆地岱山岩—珩坑北西向断裂带第四纪活动特征

通过对岱山岩-珩坑北西向断裂两侧第四纪地层的分布、构造地貌的发育等资料的分析，着重研究了该断裂带第四纪的活动特征，并探讨了活动断裂与地震活动的关系，研究结果表明：该断裂带是一条第四纪以来垂直正断兼具左旋水平走滑的活动断裂，在时间上断裂活动具有多期性；在空间上断裂活动具有迁移性；并在断裂的延伸方向存在差异活动而具有分段性，该断裂带第四纪以来宏观活动性和现今垂直形变活动性明显，1445年在该断裂最具活动的地段发生61/4级地震，表明该断裂现今仍在继续活动，今后仍有发生中强破坏性地震的可能。     

Research on Micro-relief of Active Faults on the Coast of Southeast Fujian and Its Adjacent Area

On the southeast coast of Fujian and its adjacent area, the NE-trending Changle-Zhao′an fault zone and several NW-trending faults that are genetically related to the former are well developed. With micro-relief analysis, the paper deals with the Quaternary activity of the faults and the tectonic stress field since the late Pleistocene in this region. The results indicate that the micro-relief of the NE-trending Changle-Zhao′an fault zone and the genetically related NW-trending faults is characterized by vertical and horizontal movements since the Quaternary; the faults in the region have undergone two active stages since the Quaternary, i.e. early Quaternary and late Pleistocene; since the late Pleistocene, the movement of the NE-trending faults showed a right-lateral strike-slip, while that of NW-trending faults a left-lateral strike-slip, indicating a NWW-SEE oriented horizontal principal stress of the regional tectonic stress field     

福建东南沿海及邻区活动断裂的微地貌研究

本文对福建东南沿海及邻区活动断裂进行了微地貌学分析,研究了区内断裂构造第四纪以来的活动特征,并探讨了晚更新世以来的区域构造应力场.结果表明：北东向的长乐—诏安断裂带和与之具有成生联系的北西向断裂,第四纪以来具有垂直运动和水平运动的特征;主要有两个明显的活动期,即早、中更新世和晚更新世;晚更新世以来,北东向断裂具右旋水平滑动,北西向断裂具左旋水平滑动,显示出北西西—南东东向水平挤的区域构造应力场.     

南北地震带北段及其两侧断层现今活动性

分析了南北地震带北段及其两侧跨断层流动形变资料，研究了各断裂带的活动水平、动态过程及其与强震的关系。结果表明，南北地震带北段及其两侧现今断层平均垂直活动速率为0.19mm/a，断层活动处于第四纪以来较低水平；区域断层活动增强是强震发生的重要标志之一；强震前断层异常活动存在由外围向震中迁移的特征；南西华山-六盘山断裂带为近年可能发生强烈地震的地区。     

THE NEW ACTIVITY OF TAN-LU FAULT ZONE IN SEGMENT OF DAHONGSHAN SINCE LATE QUATERNARY

The relationship between the latest activity of active fault and seismic events is of the utmost importance. The Tan-lu fault zone in eastern China is a major fault zone, of which the active characteristics of the segments in Jiangsu, Shandong and Anhui has been the focus of research. This study takes the Dahongshan segment of the Tanlu Fault in Sihong County as the main research area. We carried out a detailed geological survey and excavated two trenches across the steep slope on the southwest side of the Dahongshan. Each trench shows fault clearly. Combining the comparative analysis of previous work, we identified and cataloged the late Quaternary deformation events and prehistoric earthquake relics, and analyzed the activity stages and behavior of this segment. Fault gonge observed in the trench profiles shows that multiple earthquake events occurred in the fault. The faulting dislocated the Neogene sandstone, black gravel layer and gray clay layer. Brown clay layer is not broken. According to the relations of dislocated stratums, corresponding ¹⁴C and OSL samples were collected and dated. The result indicates that the Dahongshan segment of the Tanlu Fault has experienced strong earthquakes since the late Quaternary. Thrust fault, normal fault and strike-slip fault are found in the trenches. The microscopic analysis of slices from fault shows that there are many stick-creep events taking place in the area during the late Quaternary. Comprehensive analysis shows that there have been many paleoearthquakes in this region since the late Quaternary, the recent active time is the late Pleistocene, and the most recent earthquake event occurred in(12~2.5ka BP). The neotectonic activity is relatively weak in the Anhui segment(south of the Huaihe River)of Tanlu fault zone. There are difficulties in the study of late Quaternary activity. For example, uneven distribution of the Quaternary, complex geological structure, larger man-made transformation of surface and so on. The progressive research may be able to promote the study on the activity of the Anhui segment of Tanlu fault zone.     

新疆民丰县皮什盖-塔勒克勒格断裂带的第四纪活动特征

皮什盖-塔勒克勒格断裂将蓟县系逆掩于第四系之上，中更新世之前的西域变动显著，现今地震活动不强烈。其分支断裂帕西木断裂在中更新世之后，由正断层变为压性断层。     

西藏格林错断层带的基本特征

格林错断层带是一条晚白垩纪以前形成,第四纪以来具明显活动性质的右旋走滑断层。断层带由4条次级走滑断层呈右行右阶羽列排列而成,在两条次级走滑断层的连接部位分别形成孜桂错、格林错、瓦昂错拉分区。格林错断层带是西藏中部地区的主要发震断层之一,全新世以来,至少有4期地震地表破裂沿该断层带发生。第四纪晚期,断层具明显的分段活动性质,并且断层活动有从北西向南东、向南迁移的迹象     

滇西北龙蟠—乔后断裂带桃源段晚第四纪活动特征研究

根据详细的野外调查和剖面测绘成果,结合区域第四系测年结果等资料,对龙蟠—乔后断裂带桃源段新发现的桃源断裂、刀郭断裂、合江村断裂及已知的龙蟠—乔后断裂等4条主要断裂的晚第四纪活动特征进行研究。成果表明,龙蟠—乔后断裂带桃源段在晚第四纪的活动特征明显,活动强度中等,龙蟠—乔后断裂和合江村断裂属全新世活动断裂,桃源断裂和刀郭断裂属晚更新世断裂;晚更新世以来,龙蟠—乔后断裂和刀郭断裂以左旋走滑运动为主,而桃源断裂和合江村断裂则表现为正断走滑为主。这些断裂的活动性都不同程度地影响着研究区及附近区域的地震风险和构造稳定性。新的调查研究成果为深入认识龙蟠—乔后断裂带桃源段的晚第四纪活动性提供了新的资料,并可为深入理解该区的地震地质特征以及工程建设地震安全性评价等提供基础地质资料。     

Recent movement changes of main fault zones in the Sichuan-Yunnan region and their relevance to seismic activity

The Wenchuan earthquake occurred near the "triple junction" linking the Bayan Har block, the South China block, and the Sichuan-Yunnan rhombic block, and its influences on the surrounding blocks and the main fault zones in the Sichuan-Yunnan region, i.e., the block boundary zone, cannot be ignored. In this paper, changes of movement and stress of the fault zones before and after a strong earthquake were simulated based on the GPS repetition survey results recently obtained during 1999–2007, 2009–2011, and 2011–2013 with a two-dimensional finite-element contact model and the "block- loading" method. The results show that, before the Wenchuan earthquake, the movement of the Longmenshan fault zone was very slow and its compressive stress accumulated rapidly; after the Wenchuan earthquake, movements toward the E-SSE direction of the Bayan Har, southwestern Yunnan, and rhombic blocks were enhanced, and the dextral and horizontal compressive speeds and annual accumulative compressive stress of the Longmenshan fault zone increased markedly by factors of 4.5, 2.1, and 2.5, respectively. The southern Xianshuihe, Anninghe, Zemuhe, Daliangshan, and Lijiang-Xiaojinhe fault zones accumulated compressive stress rapidly, forming enhanced compressive stress zones along a NE strike crossing the central part of the Sichuan-Yunnan region. The tensional movement of the Xianshuihe fault zone was enhanced and the slip movement in the central part of the zone was reversed in a short time. The changes are tightly related to the medium-intensity earthquakes that occurred during the same period in this region, revealing that the spatial migration of seismic activity is related to changes of movement of the blocks.     

郯庐断裂带安徽明光段紫阳山探槽及其意义

郯庐断裂带安徽省内段落属于该断裂带的南段,断裂构造复杂,总体上断层活动性要弱于断裂带的山东、江苏段。近年来笔者多次在苏皖交界地区开展野外地质地貌调查,发现淮河南北两侧的地形地貌存在较大差异。本研究以淮河以南的郯庐断裂带东支断裂明光段为探查重点,在明光紫阳山北侧跨断层开挖地质探槽。探槽(Tc1)显示断层表现为逆冲、张裂等活动形式,且断层向上延伸错动晚第四纪地层;结合年代样品测试结果,表明该段断层晚第四纪以来有较强的活动,最新活动时代可达晚更新世-全新世早期;探槽揭露的断层表现出多种活动形式,显示了明光段断层活动的多期次性和区域构造应力场的复杂性。