共查询到17条相似文献，搜索用时 887 毫秒
1.
Xiong Renwei Ren Jinwei Zhang Junlong Yang Panxin Li Zhimin Hu Chaozhong Chen Changyun 《中国地震研究》2011,25(2):201-212
Madoi-Gadê fault is an active fault in the Bayan Har block.According to field investigation,there is an earthquake surface rupture fairly well preserved on the Gadê segment of the Madoi-Gadê fault zone.The length of the rupture is approximately 50km,with a general strike of NW.The maximum horizontal sinistral displacement is about 7.6m and the maximum vertical displacement is about 4m.A large number of earthquake traces are to be found along the rupture zone,and the phenomena on the surface rupture are also... 相似文献
2.
The Longling-Ruili fault is an important active fault in Southwestern China,striking generally northeast.The fault controls the development of the sedimentary series and magmatic action on its two sides,as well as the development of the Longling basin,Mangshi basin and the Zhefang basin along it.Due to limited Quaternary sediments and harsh natural conditions,the study of late Quaternary fault activity on the northern segment of the Longling-Ruili fault is lacking and the time of the newest faulting and the Quaternary slip rate are not clear at present.Based on the interpretation of remote images,quantitative geomorphologic deformation measurements and dating of young terrace deposits and alluvial fans,this paper obtains some new results as follows.The northern segment of the Longling-Ruili fault is a Holocene dextral strike-slip fault with some component of a normal slip.The terrace T 1 composing mainly of alluvial deposits formed during 4ka B.P.was offset by the northern segment of the Longling-Ruili fault and its left-lateral and its vertical displacements are 8m ～ 12m and 2m,respectively.The late Pleistocene alluvial fan was displaced with a left-lateral and vertical displacement of 70m and 18m,respectively.The strike-slip rate of the Longling-Ruili fault is 2.2mm/a ～ 2.5mm/a and the vertical slip rate is 0.6mm/a since the late Pleistocene epoch.The strike-slip rate of the Longling-Ruili fault is 1.8mm/a ～ 3.0mm/a and vertical slip rate is 0.5mm/a during the Holocene epoch.The proportion of horizontal to vertical displacement is about 4:1,which means that the vertical slip rate on the northern segment of the Longling-Ruili fault is about 25% of the horizontal slip rate.The left-lateral slip rate in the late Holocene is consistent with the GPS measurement.The strike slip rate is of great consistency in different time scales since the late Pleistocene epoch,indicating that the activity of the Longling-Ruili fault is of great stability. 相似文献
3.
基于钻探的芦花台隐伏断层晚第四纪活动特征 总被引：1，自引：0，他引：1
The Luhuatai fault is one of the important buried tectonics in the Yinchuan basin. Based on the results of shallow seismic exploration, we conducted composite drilling section exploration and dating of the samples from boreholes. Some useful data was obtained, such as the depth of the upper breaking point, the latest activity age, displacement in the late Quaternary, and slip rates, etc. This study shows that the activity is different between the north and south segment along the Luhuatai fault. The north segment is a Holocene fault, while the south segment is a late mid-Pleistocene fault. From north to south along the north segment of Luhuatai fault, the activity has been enhanced, and the faulting is stronger in late Pleistocene than Holocene. 相似文献
4.
Tang Rongchang Qian Hong Huang Zuzhi Wen Dehua Wu Xianguo Cai Changxing Tian Hong Seismological Bureau of Sichuan Province Chengdu China 《中国地震研究》1994,(4)
Based on fault geometric features,composite pattern,faulting land-forms and seismic data,this paper discussed the activity behavior along the northern segment of the Anninghe fault(from Xichang to Shimian)since the Late Pleistocene.The fault can be divided into three active segments by discrepancies of their activity:the segment from Xichang to Mianning,the segment from Mianning to Zimakua,and the segment from Zimakua to Tianwan.The southern segment has the background of occurrence of great earthquakes,but the middle and the northern segments can generate strong and moderate events respectively.According to the features of quartz from fault gouges by scanning electron microscopy(SEM),this paper discussed the movement features along the fault and indicated the stick-slipping feature on the segment from Xichang to Zimakua,the creeping feature on the segment from Jiziping to Tianwan and the transitional feature on the segment in between. 相似文献
5.
The East Kunlun fault zone is located in the northern margin of the Bayan Har block. The study of earthquake rupture behavior in the fault zone is of importance for understanding the future seismic risk in northwest Sichuan. A number of geological field investigations, typical micro topography DGPS measurements and sample dating show that the earthquake activity of the East Kunlun fault zone extends to the north boundary of Zoige basin, a segment known as the Luocha segment of Tazang fault. In the satellite image, the segment is seen clearly as gray and yellow strips. The earthquake deformation zone mainly features fault scarp, valleys on the slope, offset gullies and terraces, linear distribution of plants, waterfall, fault spring, fault sag pond, and landslide, collapse and talus associated with surface rupturing. These phenomena are distributed intermittently along the re-existing fault and form a ～50km-long inverse L-shaped deformation zone. Fault activities caused left-lateral offset of gullies and terraces, with horizontal displacement concentrated at 5.5m~6m, 18m～23m, 68m～75m, and 200m～220m, respectively. The recent earthquake occurred between 340±30～500±30BP. The macro epicenter is located 5km～7km northwest of Benduo village, with magnitude of MW7.3～7.4, maximum coseismic displacement of 6m, horizontal displacement 5.5m～6m and vertical displacement 0.2m～0.5m, being in a proportion of 5∶1～10∶1. These phenomena show that the Tazang fault is the causative fault of this earthquake. The fault is a Holocene active fault and was dominated recently by left-lateral movement with a small amount of thrust component under compressive shear stress. This characteristic is similar to the movement in other segments of the East Kunlun fault zone. The results of this study support the "continental escape" model. 相似文献
6.
Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone 总被引：1，自引：1，他引：1
XIANG HongFa WAN JingLin HAN ZhuJun GUO ShunMin ZHANG WanXia CHEN LiChun & DONG XingQuan Institute of Geology China Earthquake Administration Beijing China Earthquake Administration of Yunnan Province Kunming China 《中国科学D辑(英文版)》2007,50(3):331-342
Tectonically, the large-scale right-lateral strike-slip movement along the Red River fault zone is char-acterized at its late phase with the southeastward extension and deformation of the Northwestern Yunnan normal fault depression on its northern segment, and the dextral shear displacement on its central-southern segment. Research of the relations between stratum deformation and fault movement on the typical fault segments, such as Jianchuan, southeast Midu, Yuanjiang River, Yuanyang, etc. since the Miocene Epoch shows that there are two times dextral faulting dominated by normal shearing occurring along the Red River fault zone since the Miocene Epoch. The fission track dating (abbrevi-ated to FT dating, the same below) is conducted on apatite samples collected from the above fault segments and relating to these movements. Based on the measured single grain’s age and the con-fined track length, we choose the Laslet annealing model to retrieve the thermal history of the samples, and the results show that the fault zone experienced two times obvious shear displacement, one in 5.5 ± 1.5 MaBP and the other in 2.1± 0.8 MaBP. The central-southern segment sees two intensive uplifts of mountain mass in the Yuanjiang River-Yuanyang region at 3.6―3.8 MaBP and 1.6―2.3 MaBP, which correspond to the above-mentioned two dextral normal displacement events since the late Miocene Epoch. 相似文献
7.
It is indicated by historical records and the exploratory trench on the Weihe fault that the Yaodian-Zhangjiawan segment of the Weihe fault zone has experienced a historical earthquake and 3 paleoearthquake events in the past 9110a. The historical earthquake, namely, event Ⅳ, occurred between 1487 and 1568 AD. The date of paleoseismic event Ⅰ is （9110 ＋ 90） a, and the ages of events Ⅱ and Ⅲ are unknown. The coseismic vertical displacement of events Ⅰ, Ⅱ and Ⅲ is 0.5m, 0.5m and 0.2m, respectively. The exploratory trench also indicates that the Yaodian-Zhangjiawan segment of the Weihe fault was active in the Holocene. 相似文献
8.
The Huoshan fault is an important fault controlling the boundary of the Linfen basin at the middle transtensional segment of the Shanxi graben system.In this paper a discussion is made emphatically on the tectonic segmentation of the Huoshan fault,its internal geometric structures and characteristics of its activities since the late Quaternary on the basis of 1:10,000 scale geological mapping.Our investigations indicate that the Huoshan fault can be divided into 3 segments with different behaviors and structures.Among these 3,the shear segment with dextral movement is composed of a number of second-order shear faults in right-lateral stepover or left-lateral stepover arrangement.It has a maximum dextral displacement up to 9.83 km since the Pliocene,a dextral slip rate of 2.0 mm/a; a maximum vertical differential displacement of 3.44 km,and a differential oscillatory movement rate of 0.69 mm/a.The lower limit of dextral Holocene slip rate is about 5 mm/a. 相似文献
9.
《中国地震研究》1997,(2)
Based on regional geological mapping results and interpretation of satellites images and areophotos in combination with detailed field study,this paper gives the spatial distribution of recent surface activity of the Ganzi-Yushu fault zone(GYF).According to faulted landform as well as deformation and displacement of young deposit layers,the slip rates of GYF since the late Quaternary are briefly studied,combined with the results of geological chronology(14C and Thermoluminescene dating).The result shows that the average slip rates of GYF is differentiate along different segments:Ganzi segment:horizontal rate is 3.4±0.3 mm/a,vertical rate is 2.2±0.1 mm/a;Manigange segment:horizontal rate is 7.0±0.7 mm/a;Denke segment:horizontal rate is 7.2±1.2 mm/a;Dangjiang segment:horizontal rate is 7.3±0.6 mm/a. 相似文献
10.
Based on the latest displacement of Huoshan piedmont fault, Mianshan west-side fault and Taigu fault obtained from the beginning of 1990‘s up to the present, the characteristics of distribution and displacement of surface rupture zone of the 1303 Hongtong M = 8 earthquake, Shanxi Province are synthesized and discussed in the paper. If Taigu fault, Mianshan west-side fault and Huoshan piedmont fault were contemporarily active during the 1303 Hongtong M = 8 earthquake, the surface rupture zone would be 160 km long and could be divided into 3 segments, that is, the 50-km-long Huoshan piedmont fault segment, 35-km-long Mianshan west-side fault segment and 70-km-long Taigu fault segment, respectively. Among them, there exist 4 km and 8 km step regions. The surface rupture zone exhibits right-lateral features. The displacements of northern and central segments are respectively 6～7 m and the southern segment has the maximum displacement of 10 m. The single basin-boundary fault of Shanxi fault-depression system usually corresponds to M ≈ 7 earthquake, while this great earthquake (M = 8) broke through the obstacle between two basins. It shows that the surface rupture scale of great earthquake is changeable. 相似文献
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青海日月山断裂带是青藏高原东北缘柴达木—祁连活动地块内部的一条NNW走向的右旋走滑兼逆冲断裂。 本文基于ENVI 5.1遥感图像处理平台对研究区高分一号多光谱(分辨率8 m)和全色(分辨率2 m)影像进行融合, 获取了高保真、 高分辨率的卫星遥感影像。 通过多尺度、 多角度、 多层次的构造解译以及对比, 将日月山西支断裂的海晏段划分为德州段(F1-3)和海晏段(F1-4)两个次级段, 同时利用高分辨率Google Earth影像对德州段断错微地貌进行了解译、 分析, 结合对德州段野外地质考察, 进一步验证了影像解译结果。 研究表明: 日月山断裂的德州段由5条次级段落组成(f1, f2, f3, f4, f5), 并且该段断裂晚更新世以来活动性明显, 以右旋走滑为主兼有逆倾滑分量; 断裂在晚更新世以来发生过多期断层活动, 其中全新世断层活动可划分为两期, 最新一期水平位错量为6.5~8.7 m, 第二期水平位错量为12.3~14 m; 晚更新世也可划分出两期活动, 第一期水平位错量为16~20 m, 第二期水平位错量为28.5~47 m。 相似文献
13.
宁金抗沙西麓断裂位于亚东-谷露裂谷系南部.本文利用15 m分辨率的ETM 遥感影像和20 m分辨率的数字高程模型,结合野外地质考察,重点研究了该断裂的详细结构和晚第四纪以来的活动习性.依据与热隆盆地的关系,该断裂主要分为三段,热隆盆地以北为北段,热隆盆地边界断裂为中段,热隆盆地以南为南段.该断裂在强烈正断的同时兼具有左旋走滑运动,自中更新世以来,主要有三期活动,活动开始时间分别为384 ka1、08 ka和34 ka,累积水平活动速率分别为4.8 mm/a5、.5 mm/a和6.4 mm/a.断裂自中更新中期以来的垂直断错速率为1 mm/a. 相似文献
14.
Introduction The 1303 Shanxi Hongtong M=8 earthquake is the earliest M=8 event determined in histori-cal records in China and the largest recorded in Shanxi fault-depression system in history. Some researchers have discussed the tectonic environment of this earthquake (DENG, et al, 1973; DENG, 1984; DENG, XU, 1994, 1995; Seismo-geological Brigade, State Seismological Bureau, Depart-ment of Geology and Geography, Peking University, 1979; LIU, XIAO, 1982; ZHANG, JIA, 1986; SU, … 相似文献
15.
利用区域水系形态研究构造活动特征已有丰富经验,可知铁炉子—栾川—南召断裂带西段——铁炉子断裂,晚更新世以来左旋走滑速率为1.25 mm/a,而东段——栾川—南召断裂则为早—中更新世活动段,2段具有明显的活动性差异,研究二者的构造转换方式,有助于了解块体运动在该断裂带内不同段落间的平衡方式。铁炉子段在洛南盆地分为南北两支,南支断裂下盘发育的冲沟普遍流向北,呈“平行状”水系,而北支断裂下盘发育的冲沟则流向南,并在断层附近有左旋扭动迹象;卢氏盆地中部发育NE走向的沉降中心,剖面分析结果表明,该沉降中心东侧普遍高出西侧70—80 m,结合遥感影像,初步认为卢氏盆地的最新活动或已由盆地边缘向盆地内部迁移,并与铁炉子段尾端组成伸展转换区,最终导致铁炉子断裂与栾川—南召断裂的活动性差异。 相似文献
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中甸-大具断裂马家村-大具段位于哈巴雪山北麓及玉龙雪山以北的大具盆地内,总体走向310°～320°,根据卫星影像解译和详细的野外地质地貌调查,认为中甸-大具断裂马家村-大具段自第四纪以来长期活动,横跨断裂的水系右旋位错量可分为8.5～12m、22m左右、47m左右、200～280m、500～510m和1000m左右6个等级。在大具盆地内发现了长约600m的地震地表破裂带,这是该断层段在全新世活动的直接地质证据,在破裂带南东端附近开挖的探槽揭示出自晚更新世以来断裂存在三期活动,可能对应3次地震事件,结合前人在该断裂段获得的地质剖面和断错地貌面测年结果,分析认为马家村-大具段自晚更新世以来至少发生了3次古地震事件,发生时间分别为4910～45 a BP、7000 a BP左右和32.93～19.96ka BP,利用垂直同震位移值估算了水平同震位移量,最终得出每次地震事件的震级为7.5级左右。 相似文献
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利用国产GF-2和ZY-3卫星数据, 以海原断裂带哈思山南麓断裂为例, 应用目视综合解译、 三维立体解译, 结合野外验证, 定量分析国产高分数据在活动构造定量研究中的应用潜力。 GF-2融合影像展示了清晰的断层陡坎、 冲沟左旋断错及同震破裂等现象, 依据解译结果哈思山南麓断裂可分为正走滑型的荒凉滩—沙葱沟段、 左旋走滑型的沙葱沟—黄河段以及以左旋运动为主黄河—沈家庄段。 沿断裂带进行的1∶50000遥感解译工作在地层边界、 构造微地貌细节信息提取等方面均有较大的改进, 解译得到的最小左旋水平位移量4.3 m, 反映1920年海原地震的水平同震位移量, 而最大左旋水平位移量333.5 m, 则反映该段晚第四纪的持续运动。 研究表明, 海量国产高分辨率卫星数据在中国西部活动构造定量研究中可替代国外同等分辨率的数据, 具有较强的应用价值。 相似文献