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Helium isotope investigation on magnetic reversal boundaries of loess-paleosol sequence at Luochuan, central Chinese Loess Plateau

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Chinese Science Bulletin 2007年第17期52卷 2407-2412页

作者： DU XueQing1,6, WANG YongHong2. REN JianGuo3, YE XianRen4 & LU HuaYu5,1 1 State Key Laboratory of Loess and Quaternary Geology, institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2.College of Marine Geosciences, Ocean University of China, Qingdao 2.6003, China 3 National Natural Science Foundation of China, beijing 100085, China 4 Lanzhou Research Center for Petroleum and Natural Gas Resources, institute of Geology and geophysics, Chinese Academy of Sciences, Lanzhou 730000, China 5 Key Laboratory of Coast and Island Development, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 2.0093, China 6 Graduate University of Chinese Academy of Sciences, beijing 100049, China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi''an 710075 China

Extraterrestrial particles have higher 3He/4He ratios than those of terrestrial sediments ( > 100 Ra versus < 0.03 Ra, where Ra is the 3He/4He ratio normalized to the atmospheric value of 1.4×10?6). The inter- planetary dust particles (IDPs), which are very rich in 3He, continuously bombard the Earth and can accumulate in deposits. IDPs sedimentation rate changes can significantly influence 3He concentration in the Earth surface sediments. Since IDPs are not easy to detect in terrestrial deposits, measuring helium isotopes is a helpful approach to examine changes in IDPs. Helium concentration and helium isotopic composition magnetic substances and the quartz particles were examined for helium concen- tration and helium isotopic ratio. Results show that the 3He/4He ratio and the 3He concentrations of the magnetic substances are clearly higher than those of the bulk samples and the quartz particles, and, the 3He/4He ratio of the extracted magnetic substances is also higher than that of the average level of the Earth’s crust. The higher helium content in the magnetic fractions can be explained by an influx of IDPs.

关键词：中国黄土高原古土壤氦同位素行星际尘埃颗粒反方向磁化

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Cosmogenic 2.Ne concentrations and exposure ages of summit bedrocks in the Grove Mountains,Antarctica

Cosmogenic 21Ne concentrations and exposure ages of summit b...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： KONG Ping~(1,2.),DING Lin~2.LAI QingZhou~2.& HUANG FeiXin~3 1 Key Laboratory of the Earth’s Deep Interior,institute of Geology and geophysics,Chinese Academy of Sciences,{2. 10002.,China 2.Key Laboratory of Continental Collision and Plateau Uplift,institute of Tibetan Plateau Research,Chinese Academy of Sciences, beijing 100085,China 3 institute of Mineral Resources Research,China Metallurgical Geology bureau,{2. 10002.,China

Various sources of Ne and Ne exist in surface rocks:cosmogenic,in situ nucleogenic from internal II and Th,trapped crustal nucleogenic and trapped *** paper reports the first measurement,in China,of cosmogenic Ne and Ne in surface *** developed a unique sample pre-treatment procedure that effectively removed inclusions inside quartz grains,and thus maximally reduced nucleogenic contributions of Ne and ***-heating experiments show that concentrations of cosmogenic Ne and Ne in summit bedrock samples R92.2.and R92.3 from Grove Mountains,Antarctica,are (3.83±0.87)×10 and(5.2.±0.51)×10 atoms/g,*** corresponding minimum exposure ages are 2.2.0.5 and 3.0±0.3 *** indicates that the ice sheet in East Antarctica was uncovered the crest of Mount Harding,a typical nunatak in Grove Mountains,since at least mid-Pliocene.

关键词： 2.Ne cosmogenic nuclide exposure age Antarctica Grove Mountains

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Source process of the 2.11 Mw9.0 Tohuko Japan earthquake

Source process of the 2011 Mw9.0 Tohuko Japan earthquake

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： HAO JinLai~1,WANG WeiMin~(2.3,*) & YAO ZhenXing~1 1 institute of Geology and geophysics,Chinese Academy of Sciences,{2. 10002.,China 2.institute of Tibetan Plateau Research,Chinese Academy of Sciences,{2. 100085,China 3 Key Laboratory of Continental Collision and Plateau Uplift,Chinese Academy of Sciences,{2. 100085,China

On March 11,2.11,a magnitude M9.0 earthquake occurred near the east coast of Honshu,Japan,at 13:46(beijing time),with an epicenter at 38.32.°N,142.369°E and a source depth of 2. km,as determined by the United States Geological Survey(USGS)(http://***/ earthquakes/eqinthenews/).A great tsunami then battered the northeast coast of Japan after the *** wave reached a maximum height of 2..6 m in some areas (http://***/w/2.11-03-2./***). The earthquake also resulted in damage to a nuclear power plant in Fukushima that generated nuclear *** earthquake,tsunami and nuclear leakage have brought about huge economic losses and casualties.

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How Much Knowledge Has Been Obtained from an Earthquake?A Survey of seismological Publications

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Earthquake Research in China 2000年第4期14卷 88-98页

作者： Su Xiaolan, Zhu Chuanzhen,Wu Zhongliang and Huang Jinginstitute of geophysics, China{2. bureau, beijing 100081, China institute of geophysics China Seismological Bureau Beijing 100081 China

We analyzed the International Seismoogical Center(ISC)catalogue of seismologil publicationsfrom 1980 to 1995 to investigate how much infonformation provided by an earithquake hes beenutilized to obtain a better undertanding of earthauakes and selsmic *** sekect the ISCbulletin which has a wider coverage of seismological journals and languages than the ScientificCitation Index(SCI),so that there is less regional or language bias in the *** earth-quakes in the catalogue span the period from 1975 to *** which have direct relationwith an earthquake as defined by the ISC catalogue range from 1 to 10~2.in order of *** logarithm of the maximum number of papers on an earthquake is shown to be prop-ortional to the magnitude of the earthquake,which provides a possibility to define a“normali-zed impact strength”of an earthquake,so that earthquakes with different magnitudes can becompared with each *** span of the earthquakes with a certain“impact strengthlevel”

关键词： seismological publication Strategy of development ISC

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Research on the 3-D Seismic Structures in Qinghai-Xizang Plateau

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Earthquake Research in China 2002年第1期16卷 27-38页

作者： Ding Zhifeng, He Zhengqin, Wu Jianping, and Sun Weiguoinstitute of geophysics, China{2. bureau, beijing 100081, China institute of geophysics China Seismological Bureau Beijing 100081 China

Based on the recording data from the analogue and broadband digital seismic stations in and around Qinghai-Xizang (Tibet) Plateau, the three dimensional (3-D) seismic velocity structures in Qinghai-Xizang Plateau were obtained by using the regional body wave tomography and surface wave tomography. The results from these two tomography methods have similar characteristics for P- and S-wave velocity structures in crust and upper mantle. They show that there are remarkable low velocity zones in the upper crust of Lhasa block in the southern Qinghai-Xizang Plateau and the lower crust and upper mantle of Qiangtang block in the northern Qinghai-Xizang Plateau. These phenomena may be related to the different steps of collision process in southern and northern Qinghai-Xizang Plateau.

关键词： Qinghai-Xizang Plateau Seismic tomography 3-D velocity structure

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Analysis on Source Process of Strong Earthquakes in Qinghai Province Based on Broadband Data

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Earthquake Research in China 1998年第3期12卷 17-23页

作者： Gao Yuan, Wu Zhongliang, and Zhou HuilanGraduate School of USTC, Academia Sinica, beijing 100039, ChinaCenter for Analysis and Prediction, China seismological{2., beijing 100036, Chinainstitute of geophysics, China seismological{2., beijing 100081, China

Four earthquakes with M > 6.0 occurred in Qinghai Province, China froth 1988 to 1990. Using broadband data from GDSN, the source ruptures of these earthquakes and tectonic surroundings were studied using waveform modelling combined with background data of geological tectonics. Through the analysis of apparent source time function (aSTF) and apparent time difference (aTD), the complexity of sources was discussed, and in view of source analysis, the result further supports the conclusion that the compressive stress axis of tectonic stress field in northeastern Qinghai-Xizang (Tibetan) plateau is at the NE direction, is nearly horizontal, turns counter-clockwise to the NEE or N to S direction, and is nearly horizontal close to the northern Qinghai-Xizang plateau.

关键词： Qinghai-Xizang (Tibetan) plateau Source process Rupture Apparent source time function (aSTF) Apparent time difference (aTD).

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Critical load of sulfur deposition for ecosystemand its application in China

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Journal of Environmental Sciences 1995年第3期7卷 325-337页

作者： Zhao Dianwu Zhang Xiaoshan Yang Jianxin(Research Center for Eco-Environrnental Sciences , Chinese Academy of Sceiences, beijing 100085, China)Mao Jietai(Department of geophysics, Peking University.{2. 100871 . China)Xiong Jiling(Guizhou institute o

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关键词： sulfur deposition critical load : ecosystem.

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Receiver Function Estimated by Wiener Filtering

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Earthquake Research in China 2003年第4期17卷 386-391页

作者： Wu Qingju, Tian Xiaobo, Zhang Nailing, Li Weiping and Zeng Rongshenginstitute of geophysics, China{2. bureau, beijing 100081, China institute of geophysics China Seismological Bureau Beijing 100081China

Wiener filtering is used to estimate receiver function in a time_domain. With the vertical component of 3_component teleseismic P waveform as the input of a Wiener filter, receiver function as the filter response, and radial and tangential components as the expected output, receiver function is estimated by minimizing the error between expected and actual outputs. Receiver function can be obtained by solving the Toeplitz equation using the Levinson algorithm. The non_singularity of the Toeplitz equation ensures the stability of Wiener Deconvolution. Both synthetic and observational seismogram checks show that Wiener Deconvolution is an effective time_domain method to estimate receiver function from teleseismic P waveform.

关键词： Receiver function Wiener filter Toeplitz equation Levinson algorithm

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High-Resolution Seismic Reflection Profiling of the Fenhe Fault in Taiyuan City

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Earthquake Research in China 2003年第1期17卷 73-84页

作者： You Huichuan, He Zhengqin, Ding Zhifeng, Wu Jianping and Wu Qingjuinstitute of geophysics, China{2. bureau, beijing 100081, China institute of geophysics China Seismological Bureau Beijing 100081 China

In this paper, we demonstrate the high resolution seismic reflection data for a depth range of several hundred meters across the Fenhe fault in Taiyuan city, China. In combination with the relevant borehole logs, these data provide useful constraints on the accurate position, geometry and deformation rate of the fault, as well as the kinematics of recent fault motion. The high resolution seismic reflection profiling revealed that the western branch of the Fenhe fault is a high angle, eastward dipping, oblique normal fault, and cutting up to the lower part of the Quaternary system. It was revealed that the top breaking point of this fault is at a depth of ～70m below the ground surface. A borehole log across the Fenhe fault permitted us to infer that there are two high angle, oppositely dipping, oblique normal faults. The eastem branch lies beneath the eastern embankment of the Fenhe river, dipping to the west and cutting into the Holocene late Pleistocene strata with a maximum vertical offset of ～8m. Another borehole log across the northern segment of the Fenhe fault indicates that the western branch of this fault has cut into the Holocene late Pleistocene strata with a maximum vertical offset of ～6m. The above mentioned data provide a minimum average Pleistocene Holocene vertical slip rate of 0 06～0 08mm/a and a maximum average large earthquake recurrence interval of 5 0～6 7ka for the Fenhe fault.

关键词： Taiyuan city Fenhe fault High resolution seismic reflection profiling

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Holocene Paleoseismic Activity Along the Northern Piedmont Fault of the Hengshan Mountain, South of Datong Basin in Shanxi Province

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Earthquake Research in China 2003年第3期17卷 206-219页

作者： Jiang Wali, Xie Xinsheng, Wang Huanzhen, Feng Xiying and Zhang Kangfuinstitute of Crustal Dynamics, China seismological{2., beijing 100085, China institute of Crustal Dynamics China Seismological Bureau Beijing 100085 China

Our field investigation indicates that the northern piedmont fault of the Hengshan Mountain has dislocated proluvial fan and terrace I of the gully mouth on the northern border of the Hengshan Mountain. Stratigraphic age data indicates that the surface layer in the middle and rear part of the proluvial fan and on the terrace I of the gully mouth on the mountain border consists of sediments of about 52.0～6800a B.P. The Hezhuang and Niucaoyu trenches excavated in the front of Hengshan Mountain revealed that 3 paleoseismic events have occurred along the northern piedmont fault of Hengshan Mountain since the early Holocene. The 3 paleoseismic events occurred in 2.60±190～4370±150a BP, nearly 562.±150a BP, and 8083±2.0～8430±72.a BP, respectively, and their recurrence interval is 2.13a,2.2.a and 2.71a on average. The coseismic vertical displacement produced by these events is 1 0～3 0m. The elapsed time of the latest movement along the fault has exceeded the recurrence interval of these paleoearthquakes. Thus, there exists the possibility of strong earthquake occurrence along the fault from now onward, so the fault is in need of observation.

关键词： Trenching Paleoearthquake Holocene Northern Hengshan piedmont fault

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