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A Preliminary Study on Geological and Seismogenic Structures in the Region of 196. M 7.4 Bohai Sea Earthquake

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Earthquake Research in china 2001年第4期15卷 365-379页

作者： Xu Jie, Gao Zhanwu, Sun Jianbao, and Song Changqinginstitute of geology,{2. seismological bureau, Beijing 10002.,{2. institute of geology China Seismological Bureau Beijing 100029 China

A more detailed and deep-going analysis of tectonic conditions for the 1989 Bohai Sea M 7.4 earthquake area has been made based on the data of oil geological exploration and results of seismological researches. The obtained result fills the gap in seismotectonic research of Large Bohai Sea earthquake area of North china. The earthquake area is located in the eastern part of Cenozoic rifted basin of the Bohai Gulf, along the intersection zone between the NNE-trending Yingkou-Weifang fault zone and the NW-trending Beijing-Penglai fault zone. In the early-Tertiary fault-depression stage, three sets of faults, the NNE-, NW-, and W-E-trending faults, were developed in the upper crust in the area. They are listric and planar in the form, of normal fault character and mostly the major faults in faulted depressions. In the fault-depression stage since late Tertiary, the preexisting faults have undergone movement to different extent. Meanwhile, a new NE-trending Huanghekou (Yellow River Mouth)-Miaoxibei fault zone was developed. The focal faulting of the M 7.4 earthquake, striking to N45°E and dipping to SE, is nearly vertical, with dextral strike-slip nature, and buried down to depth of 15～34 km. The seismogenic fault for the large earthquake is not the Yingwei fault, but the newly generated Huanghekou-Miaoxibei fault.

关键词： Bohai Gulf basin Bohai Sea Ms7.4 earthquake Newly generated fault zone Lis tric fault

Upper limit for the rheological strength of crust in continental subduction zone:Constraints imposed by laboratory experiments

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Upper limit for the rheological strength of crust in contine...

PERCUSSION FIGURES OF BIOTITE IN NATURALLY DEFORMED ROCKS: AN IMPORTANT EVIDENCE FOR HIGH STRAIN RATE EVENTS

地壳深部压力状态与地质作用学术研讨会

作者： Zhou Yongshengl Zhong Dalai He Changrong, (institute of geology & Laboratory of Tectonophysics,{2. seismological bureau, Beijing, 10002. 2.institute of geology and Geophysics, Chinese Academy of Science, Beijing, 10002.)

＜正＞ The transition pressure of quartz-coesite in differential stress and highly strained conditions is far from stability field under static pressure. So, the effect of differential stress should be considered when estimating the depth of petrogenesis about ultrahigh pressure metamorphic （UHPM） rocks. Rheological strength of typical ultrahigh pressure rocks in continental subduction zone was calculated based on the laboratory experiments. The results show that: （1） The rheological strength is similar between gabbro and eclogite, which is smaller than that of clinopyroxenite in the same condition. （2. The calculated strength of rocks （gabbro, eclogite and clinopyroxenite） related to UHPM is decreased near one order of magnitude with temperature rising 100℃in the range of 6.0℃to 900℃. The calculated strength is far great than faulting strength of rocks at 6.0℃, and isin several hundred to more than one thousand mega-pascal at 700-800 ℃, which suggests, that those rocks are in brittle deformation region at 6.0℃, but are in semibrittle to plastic deformation region at 700-800℃. Obviously, 700 ℃is a brittle-plastic transition boundary. （3） The calculated Theological strength in localized deformation zone at higher strain rate condition （1.6.～10-12.-1） is 2.5 times than that in distributed deformation zone at lower strain rate condition（1.6.～10-14s-1）. The average Theological stress （16.0MPa） in strain rate of 10 -12.-1 stands for ultimate differential stress of UHPM rocks in semibrittle flow field, and the average theological stress （550-950MPa） in strain rate of 10～14 -10-13S-1 stands for ultimate differential stress of UHPM rocks in plastic flow field, which suggest that the forming depth of UHPM rocks is 2.-6. km from depth estimated under static pressure condition because of the effect of differential stress.

关键词： Differential stress Rheological strength Ultrahigh pressure metamorphic (UHPM) rocks Continental subduction zone High temperature and high pressure experiment

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Chinese Science Bulletin 1985年第1期30卷 93-95页

作者：何永年徐树桐 institute of geology State Seismological Bureau Beijing institute of geology Geological Bureau of Anhui Province

It has long been known that different deformation features in the same type of rooks resulted from different strain rates. High strain rate deformation must be involved when we study the deformation features of the wall rocks of paleo-earthquake faults, volcanic craters, astroblems and nuclear explosion craters. As far as recent knowledge goes, the high pressure polymorphs of quartz (coesite and stishovite), basal lamella of quartz, myskelynite and specific slip band in some minerals are all considered as products of high strain rate deformation.

关键词： quartz volcanic explosion minerals RATE basal figures latter grains drill

Geomorphic Evidence for and Rate of Sinistral Strike-slip Movement Along Northwest-trending Faults in Chaoshan Plain

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Earthquake Research in china 2000年第4期14卷 66-75页

作者： Wang Yipeng , Song Fangmin , Huang Qingtuan , and Chen Weiguanginstitute of geology,{2. seismological bureau, Beijing 10002.,{2.Xiamen seismological Survey and Research Center, seismological bureau of Fujian Province, Xiamen 36.02.,{2. Institu institute of geology China Seismological Bureau Beijing 100029 China Xiamen seismological Survey and Research Center Seismological Bureau of Fujian Province Xiamen 361021 China institute for Engineering Earthquake Prevention Seismological Bureau of Guangdong Province Guangzhou 510070 China

Two sets of active faults,northwest-and northeast-trending faults,are developed in the Chao-shan Plain of East *** detailed interpretation of aerophotos,we have found outthat there is the clear phenomenon of sinistral dislocation of drainage system on the Huang-gang-shui fault and part of Fengshun-Shantou *** investigation confirmed that the geo-morphic bodies along the two faults have undergone ***-scale topographicmapping was made at three displaced sites and samples for age dating were collected from thegeomorphic *** indicates that the average rate of sinistral strike-slip movementin the Holocene time amounts to 1.11±0.09～2.6.±0.2.mm/a along the Huanggangshuifault and 3.2.0}0.2.0}m/a along the Fengshun-Shantou *** two more active NW-trending faults extend into sea area,where they intersect the NE-trending strongly active Nius-han Island-Xiongdi Isle-Nanpeng Isles fault at a depth of 40～50m in *** intersection isa location favorable

关键词： Chaoshan Plain Fault Strike-slip rate Geomorphic body

QUATERNARY GROWTH FOLDS IN THE JIUXI BASIN AT THE NORTHEASTERN MARGIN OF THE QINGHAI—XIZANG PLATEAU

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地学前缘 2000年第S1期7卷 333-334页

作者： Chen Jie 1, Karl\|Heinz Wyrwoll 2. Annette George 3,Lu Yanchou 1 (1 institute of geology,{2. seismological bureau, P.O.Box 9803,Beijing 10002.,{6., E\|mail:chenjie@*** 2.Department of Geography, University of Western Australia, N

As a consequence of the collision of India with Asia, the Qilian Shan, rising 4000～5000m above the Gobi, marks the northeastern boundary of the Tibet—Qinghai Plateau. The Qilian Shan developed as a WNW—ESE fold\|and\|thrust belt with most of the movement directed towards the NEN—NE. Its foreland margin, the Jiuxi Basin, accommodates thick sequences of Late Cenozoic alluvial sediments derived from the Qilian Shan. Thin\|skinned fold\|and\|thrust deformation in the Jiuxi basin flanking the Qilian Shan, feature Mesozoic and Cenozoic sedimentary rocks that have been detached from the underlying basal decollement and folded into a series of NW—WNW trending anticlines and synclines. Towards the south deformation in the Jiuxi basin is accommodated by a west\|north\|west fold train (Qingcaowan, Laojunmiao, and Shiyougou folds) developed during the Quaternary. These form a distinct topographic feature separating the Qilian Shan from the central Jiuxi Basin. The doubly plunging Laojunmiao anticline is 10km long and 5km wide. It is asymmetric in shape, having a steep to overturned northern limb, and a backlimb dips to the south at 2.～30°. The Laojunmiao anticline is composed of two distinct stratigraphic sequences which are defined by a syntectonic unconformity.

关键词： Qilian Shan Quaternary growth fold growth strata erosion rate uplift rate

THE ACTIVITY OF A FAULT ZONE INFERRED FROM MICROSTRUCTURAL STUDY OF DEFORMED ROCKS

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地震地质 1986年第2期 91-96+104页

作者： He Yongnian,Lin Chuanyong and Shi Lanbin (institute of geology,{2. Seismologicctl bureau)

The neotectonic activity of a minor fault zone on the Southwest margin of Yangzi platform has been studied based on analysis and comparison of the microstructural features of deformed rocks within and outside the fault *** to thermoluminesccne dating it is proposed that after Pleistocene there would be more than one active period of the *** strees of the main period was up to 700 *** strain and stress of the rocks within the fault during the faulting process were significantly greater than those in the rocks outside the fault.

关键词： THE ACTIVITY OF A FAULT ZONE INFERRED FROM MICROSTRUCTURAL STUDY OF DEFORMED ROCKS than show

INVESTIGATION　INTO　COMPRESSIONAL　WAVE　VELOCITIES　IN　QUARTZITE　AT　HIGH　TEMPERATURES　AND　PRESSURES

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Scientia Geologica Sinica 1994年第1期 91-101页

作者： Zhang Younan and Ma Jin(institute of geology, {2. Seismologlogical bureau, Beijing 10002.)

ＩＮＶＥＳＴＩＧＡＴＩＯＮＩＮＴＯＣＯＭＰＲＥＳＳＩＯＮＡＬＷＡＶＥＶＥＬＯＣＩＴＩＥＳＩＮＱＵＡＲＴＺＩＴＥＡＴＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＳＡＮＤＰＲＥＳＳＵＲＥＳ￥ＺｈａｎｇＹｏｕｎａｎａｎｄＭａＪｉｎ（Ｉｎ... 详细信息

ＩＮＶＥＳＴＩＧＡＴＩＯＮＩＮＴＯＣＯＭＰＲＥＳＳＩＯＮＡＬＷＡＶＥＶＥＬＯＣＩＴＩＥＳＩＮＱＵＡＲＴＺＩＴＥＡＴＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＳＡＮＤＰＲＥＳＳＵＲＥＳ￥ＺｈａｎｇＹｏｕｎａｎａｎｄＭａＪｉｎ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，...

关键词： AT INTO WAVE AND COMPRESSIONAL

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北京地区一批地质样品的C14年代测定

地质科学 1980年第2期2卷 201-202页

作者： Radiocarbon Dating Laboratory, institute ofArchaeology, Chinese Academy of Sociologyand Radiocarbon Dating Lalioratory, institute of{2., state seismological bureau 国家地震局地质研究所C~(14)实验室中国社会科学院考古研究所C~(14)实验室

我们于1974年,1977—1978年测定了北京地区全新世和晚更新世54个样品的C年代数据。其中,考古研究所C实验室测定了34个样品(标本由陈方吉、张子斌、孙秀萍等提供,编号ZK),有6.数据已发表;国家地震局地质研究所C实验室测定了2.个样品(标... 详细信息

我们于1974年,1977—1978年测定了北京地区全新世和晚更新世54个样品的C年代数据。其中,考古研究所C实验室测定了34个样品(标本由陈方吉、张子斌、孙秀萍等提供,编号ZK),有6.数据已发表;国家地震局地质研究所C实验室测定了2.个样品(标本由本实验室和一○一地质队等采集,编号CG),有4个样品的数据已发表。现将44个样品的C年代数据列于下表。

关键词：地质样品孔距年代测定木炭固体燃料 ZK 井距地表地球表面小王庄延庆国家地震局地质研究所北京

ANALYSIS OF DYNAMIC CHARACTERISTICS OF FIXED PILE SUPPORTED JACKET OFFSHORE PLATFORMS

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china Ocean Engineering 1987年第4期 39-46页

作者： Cai Zhi-rui, Tao Gui-yuan and Zao Gong-ran Chinese National Natural Science FoundationResearch Professor, institute of Engineering Mechanics, state seismological bureau, Haerbin Research Associate Professor, institute of Engineering Mechanics, state seismological bureau, Haerbin Engineer, institute of Engineering Mechanics, state seismological bureau, Haerbin

- The analysis of eigenvalues of fixed pile-supported jacket offshore platforms is presented in this paper. The finite element method of the space jacket structural model is used for the analysis. The first nine mode shapes and frequencies are calculated. Calculated results are compared with the test results of platform No. 12.in Bohai Bay. The calculated results are in good agreement with the test results, which means that the method of analysis used in this paper may be uesful in the future design practice.

关键词： mode ANALYSIS OF DYNAMIC CHARACTERISTICS OF FIXED PILE SUPPORTED JACKET OFFSHORE PLATFORMS