检索结果-南通市图书馆

Fission track dating of the Cenozoic uplift in Mabian area, southern Sichuan Province, China

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2008年第9期51卷 1238-1247页

作者： AN YanFen han zhujun WAN JingLin Institute of Geology China Earthquake AdministrationBeijing 100029China

The apparent ages of samples are obtained from fission track dating of apatite samples collected from the fault zones in Mabian area, southern Sichuan Province. In addition, thermal history is simulated from the obtained data by applying AFT Solve Program, to acquire the thermal evolution history of the samples. The result shows that tectonically the Mabian area was relatively stable between 25 and 3 Ma, compared to the inner parts and other marginal areas of the Tibetan Plateau. The studied area had little response to the rapid uplift events that occurred for several times in the Tibetan Plateau during 25-3 Ma. The latest thermal event related to the activity of the Lidian fault zone (about 8 Ma ) is later than that of the Ebian fault zone (18-15 Ma ) to the west, indicating to some extent that the evolution of fault activity in the Mabian area has migrated from west to east. The latest extensive tectonic uplift occurred since about 3 Ma. As compared with the Xianshuihe fault zone, the Mabian area is closer to the east- ern margin of the plateau, while the time of fast cooling event in this area is later than that in the southeast segment of the Xianshuihe fault zone (3.6-3.46 Ma ). It appears to support the assumption of episodic uplift and stepwise outward extension of the eastern boundary of the Tibetan Plateau in late Cenozoic.

关键词： Mabian area southern Sichuan Province apatite fission track thermal history simulation uplift fault activity

Seismotectonics of the 26 November 2005 Jiujiang-Ruichang,Jiangxi,Ms 5.7 Earthquake

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2012年第2期86卷 497-509页

作者： han zhujun LUFushui JI Fengju ZENG Xinfu An Yanfen Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake AdministrationBeijing 100029China Earthquake Administration Bureau of Jiangxi Province Nanchang 330039China

The 26 November 2005 Jiujiang-Ruichang, Jiangxi, Ms 5.7 earthquake occurred in a seismotectonic setting of moderate earthquake. The northwest-trending Xiangfan-Guangji fault （XFG） does not enter into the epicenter vicinity, but the northeast-trending Ruichang-Wuning fault （RWF） as a regional fault extends to the epicenter nearby, appearing as the Ruichang basin and its marginal faults. Tilting of the Ruichang Basin （RCB） in the Quaternary was controlled by the RCB southeast- marginal, buried fault （RSMBF）. Shallow geophysical survey reveals that the RSMBF caused an offset of the reflection layers. Drill hole columnar section demonstrates that there are about 10-12 m displacement in the lower section of the middle-Pleistocene Series along the RSMBF, but no disruption is found in the upper section of the middle-Pleistocene Series. The RSMBF not only has activity in the Quaternary, but also coincides with the nodal plane I from the focal mechanism of the Jiujiang- Ruichang Ms 5.7 earthquake. This evidence, including aftershock distribution and isoseismic lines, strongly suggests that the RSMBF might be the seismogenic tectonics. The RWF is discontinuous at the surface, and consists of three en echelon Quaternary basins, which are the Ruichang, Fanzhen and Wuning basins. Three moderate earthquakes, the Fanzhen ML 4.9 earthquake, the Yejiapu ML 4.1 earthquake and the Jiujiang-Ruichang Ms 5.7 earthquake, have happened in the basins since 1995. The seismogenic tectonics of the Jiujiang-Ruichang Ms 5.7 earthquake is not isolated, but may be controlled by the RWF at depth, the slip of which causes the accumulation of energy for earthquake occurrence.

关键词： Jiujiang-Ruichang Ms 5.7 earthquake buried fault Ruichang basin seismo-tectonics

Activity of the Lenglongling fault system and seismotectonics of the 2016 MS6.4 Menyuan earthquake

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2017年第5期60卷 929-942页

作者： GUO Peng han zhujun AN YanFen JIANG WenLiang MAO ZeBin FENG Wei Key Laboratory of Active Tectonics and Volcano Institute of Geology China Earthquake Administration Beijing 100029 China Key Laboratory of Crustal Dynamics Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China China University of Geosciences School of Earth Sciences and Resources Beijing 100083 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China China Earthquake Networks Center Beijing 100045 China

The MS6.4 Menyuan earthquake occurred on the northern side of the Lenglongling fault(LLLF) in the mid-western of the Qilian-Haiyuan fault zone on January 21, 2016. The earthquake epicenter was distant from the Minle-Damaying and Huangcheng-Shuangta faults, eastern of the Northern Qilian Shan fault zone. A near northwest-striking rupture plane intersects the two faults at a certain angle. The focal mechanism solution shows that this was a thrust-type earthquake, slightly different from the strike-slip movement with a thrust component of the LLLF. Field geological mapping, tectonic geomorphology analysis, trench excavation and 14 C dating reveal that(1) the LLLF has been obviously active since the Holocene, and may behave with characteristic slip behavior and produce M_W7.3–7.5 earthquakes;(2) the LLLF appears as a flower structure in terms of structure style, and dips NNE at a steep angle; and(3) the most recent earthquake event occurred after 1815–1065 a BP. An associated fault, the Northern Lenglongling fault(NLLLF), is located at the northwestern end of the LLLF. Consequently, the NLLLF was continually subject to tectonic pushing effects from the left-lateral shear at the end of the LLLF, and, accordingly, it bent and rotated outward ***, the fault deviated from the dominant rupture azimuth and activity weakened. In the late Quaternary, it behaved as a thrust fault with no obvious deformation at the surface. This is indicated by the arc shape, with a micro-protrusion northeastward,and no geologic or geomorphic signs of surface rupturing since the late Quaternary. However, such faults could still rupture at depth, producing moderate-strong earthquakes. The geometric and kinematic properties of the NLLLF are in good agreement with the occurrence and kinematic properties of nodal plane 2, and with the distribution characteristics of the aftershocks and seismic intensity. Therefore, the NLLLF is a more suitable seismogenic structure for the MS 6.

关键词： MS6 4 Mengyuan earthquake Seismogenic structure Tectonic environment Lenglongling fault Northern Lenglongling fault

同方期刊数据库

Newmark displacement model for landslides induced by the 2013 Ms 7.0 Lushan earthquake, China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2016年第4期10卷 740-750页

作者： Renmao YUAN Qinghai DENG Dickson CUNNINGHAM zhujun han Dongli ZhanG Bingliang ZhanG Key Laboratory of Active Tectonics and Volcano Institute of Geology China Earthquake Administration Beijing 100029 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao 266590 China Department of Environmental Earth Science Eastern Connecticut State University Connecticut 06226 USA

Predicting approximate earthquake-induced landslide displacements is helpful for assessing earthquake hazards and designing slopes to withstand future earth- quake shaking. In this work, the basic methodology outlined by Jibson （1993） is applied to derive the Newmark displacement of landslides based on strong ground-motion recordings during the 2013 Lushan Ms 7.0 earthquake. By analyzing the relationships between Arias intensity, New- mark displacement, and critical acceleration of the Lushan earthquake, formulas of the Jibson93 and its modified models are shown to be applicable to the Lushan earthquake dataset. Different empirical equations with new fitting coefficients for estimating Newmark displace- ment are then developed for comparative analysis. The results indicate that a modified model has a better goodness of fit and a smaller estimation error for the Jibson93 formula. It indicates that the modified model may be more reasonable for the dataset of the Lushan earthquake. The analysis of results also suggests that a global equation is not ideally suited to directly estimate the Newmark displacements of landslides induced by one specific earthquake. Rather it is empirically better to perform a new multivariate regression analysis to derive new coefficients for the global equation using the dataset of the specific earthquake. The results presented in this paper can be applied to a future co-seismic landslide hazard assessment to inform reconstruction efforts in the area affected by the 2013 Lushan Ms 7.0 earthquake, and for future disaster prevention and mitigation.

关键词： Newmark displacement of landslide Ariasintensity critical acceleration empirical relationship theLushan Ms 7.0 earthquake

Surface deformation at the epicenter of the May 12,2008 Wenchuan M8 Earthquake,at Yingxiu Town of Sichuan Province,China

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第S2期51卷 154-163页

作者： DONG ShaoPeng,han zhujun & AN YanFen National Center of Seismic Fault Study,Institute of Geology,China Earthquake Administration,Beijing 100029,China National Center of Seismic Fault Study Institute of Geology China Earthquake Administration Beijing China

Surface deformation,along National Highway 213 at the epicenter of Wenchuan M8 earthquake,at Yingxiu Town of Sichuan Province,China,is surveyed and measured in *** results show two distinct *** is that no horizontal displacement displays,or dextral strike-slip component at the observation point can not be found basically,the other is that uplift amount is 2.72 m,and the short-ening amount is 0.38 m,which reflects thrust shortening deformation is not *** crust uplift amount of 2.71 m is distributed in a belt with width of 60 *** model of lower crustal flow proposed by Royden et al.(1997) about the dynamic process in eastern margin of the Tibetan Plateau seems more suitable to explain the seismic surface deformation characteristics at Yingxiu Town,the epicenter of the May 12,2008 Wenchuan M8 Earthquake.

关键词： Wenchuan M8 Earthquake Yingxiu Town surface deformation

ASSESSMENT OF ENVIRONMENTAL QUALITY FOR EARTHQUAKE RISK IN BEIJINGAREA──THE APPLICATION OF GEOGRAPHIC INFORMATION SYSTEM（GIS）

在线全文

学校读者我要写书评

暂无评论

地震地质 1994年第3期 211-213+2174+215页

作者： han zhujun Jiang Pu Wang Liangmou Yu Keta Liu Peixun（Institute of Geology. SSB． Beijing 100029）

ＡＳＳＥＳＳＭＥＮＴＯＦＥＮＶＩＲＯＮＭＥＮＴＡＬＱＵＡＬＩＴＹＦＯＲＥＡＲＴＨＱＵＡＫＥＲＩＳＫＩＮＢＥＩＪＩＮＧＡＲＥＡ──ＴＨＥＡＰＰＬＩＣＡＴＩＯＮＯＦＧＥＯＧＲＡＰＨＩＣＩＮＦＯＲＭＡＴＩＯＮＳＹＳＴＥＭ（... 详细信息

ＡＳＳＥＳＳＭＥＮＴＯＦＥＮＶＩＲＯＮＭＥＮＴＡＬＱＵＡＬＩＴＹＦＯＲＥＡＲＴＨＱＵＡＫＥＲＩＳＫＩＮＢＥＩＪＩＮＧＡＲＥＡ──ＴＨＥＡＰＰＬＩＣＡＴＩＯＮＯＦＧＥＯＧＲＡＰＨＩＣＩＮＦＯＲＭＡＴＩＯＮＳＹＳＴＥＭ（ＧＩＳ）ＨａｎＺｈｕｊｕｎ；Ｊｉａ...

关键词： :Geographic Information System(GIS).Beijing area Earthquakc risk.Environment

Large-Scale Dextral Strike-Slip Movement and Associated Tectonic Deformation Along the Red-River Fault Zone

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earthquake Research in China 2005年第2期19卷 125-138页

作者： Xiang Hongfa han zhujun Guo Shunmin Zhang Wanxia Chen Lichun Institute of Geology CEA Beijing 100029 China

Field investigation has revealed that the large-scale dextral strike-slip movement and the associated tectonic deformation along the Red River fault zone have the following features: geometrically, the Red River fault zone can be divided into three deformation regions, namely, the north, central and south regions. The north region lies on the eastern side of the Northwest Yunnan extensional taphrogenic belt, which is characterized by the 3 sets of rift-depression basins striking NNW, NNE and near N-S since the Pliocene time, and on its western side is the Lanping-Yunlong compressive deformation belt of the Paleogene to Neogene; the deformation in the central region is characterized by dextral strike-slip or shearing. The east Yunnan Miocene compressive deformation belt lies on the eastern side of the fault in the south, and the Tengtiaohe tensile fault depression belt is located on its west. In terms of tectonic geomorphology, the aforementioned deformation is represented by basin-range tectonics in the north, linear faulted valley-basins in the central part and compressive (or tensional) basins in the south. Among them, the great variance in elevation of the planation surfaces on both sides of the Cangshan-Erhai fault suggests prominent normal faulting along the Red River fault since the Pliocene. From the viewpoint of spatial-temporal evolution, the main active portion of the fault was the southern segment in the Paleogene-Miocene-Pliocene, which is represented by “tearing” from south to north. The main active portion of the fault has migrated to the northern segment since the Pliocene, especially in the late Quaternary, which is characterized by extensional slip from north to southeast. The size of the deformation region and the magnitude of deformation show that the eastern plate of the Red River fault has been an active plate of the relative movement of blocks.

关键词： Extensive-strike slip-compressive deformation Tectonic geomorphology Miocene Red River fault zone Southwest China

Lushan M_S7.0 earthquake:A blind reserve-fault event

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第28期58卷 3437-3443页

作者： XU XiWei WEN XueZe han zhujun CHEN GuiHua LI ChuanYou ZHENG WenJun ZHNAG ShiMin REN ZhiQun XU Chong TAN XiBin WEI ZhanYu WANG MingMing REN JunJie HE ZhongTai LIANG MingJian Key Laboratory of Active Tectonics & Volcano Institute of GeologyChina Earthquake Administration Sichuan Earthquake Administration Institute of Crustal Dynamics China Earthquake Administration

In the epicenter of the Lushan MS7.0 earthquake there are several imbricate active reverse faults lying from northwest to southeast,namely the Gengda-Longdong,Yanjing-Wulong,Shuangshi-Dachuan and Dayi *** field investigations have indicated that no apparent earthquake surface rupture zones were located along these active faults or their adjacent *** brittle compressive ruptures in the cement-covered pavements can be seen in Shuangshi,Taiping,Longxing and Longmen Townships,and these ruptures show that a local crustal shortening occurred in the region during the *** spatial distribution of the relocated aftershocks and focal mechanism solutions,it is inferred that the Lushan earthquake is classified as a typical blind reverse-fault earthquake,and it is advised that the relevant departments should pay great attention to other historically un-ruptured segments along the Longmenshan thrust belt and throughout its adjacent areas.

关键词：地震地表破裂带庐山故障事件储备邻近地区震源机制解地壳缩短

Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第3期50卷 331-342页

作者： XIANG HongFa WAN JingLin han zhujun GUO ShunMin ZhanG WanXia CHEN LiChun DONG XingQuan Institute of Geology China Earthquake AdministrationBeijing 100029China Earthquake Administration of Yunnan Province Kunming 650204China

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.

关键词： geological analysis fission track dating the Red River fault dextral displacement times