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Joint exploration of crustal structure in Fuzhou basin and its vicinities by deep seismic reflection and high-resolution refraction as well as wide-angle reflection/refraction

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Science china Earth Sciences 2005年第7期48卷 925-938页

作者： ZHU Jinfang1, XU Xiwei2. ZHANG Xiankang3. HUANG Zonglin1, CHEN Xiangxiong1, FANG Shengming3. LIU Baojin3. ZHENG Rongzhang2.4 1. Seismological Bureau of Fujian Province,Fuzhou 3.0003.china 2. Institute of Geology,china Earthquake Administration,Beijing 10002.,china {3.,china Earthquake Administration,zhengzhou 450002.china 4. State Key Laboratory of Earthquake Dynamics,Institute of Geology,china Earthquake Administration,Beijing 10002.,china Seismological Bureau of Fujian Province Fuzhou 350003 China Institute of Geology China Earthquake Administration Beijing 100029 China research center for {2. {3. China Earthquake Administration Zhengzhou 450002 China State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China

The Fuzhou basin and its vicinities are located at the northern end of the southeastern coastal seismic zone of the mainland of china. By the joint explorations of high-resolution seismic refraction and wide-angle reflection/refraction as well as deep seismic reflection in the region, which is the first synthetic profile in china, its fine velocity structure and geometric structure from the ground to Moho discontinuity is obtained. The result shows that the crust is obviously layered with a thickness of about 3. km. Basically, it consists of two parts: upper crust and lower crust. The velocity of the upper crust is 5.9-6.2.km/s in which there is a 3.4-km-thick weak low-velocity layer between the depths of 10-15 km, while the velocity of the lower crust in the range of 6.3.7.2.km/s. There exists a strong velocity gradient layer about 3.km thick above the Moho discontinuity whose velocity increases from 6.5 to 7.2. km/s. There exist high-angle normal faults that are small in size and extend only in the shallow crust. These faults are the secondary developed on the hanging wall of westward dipping low-angle normal faults. Thus, their seismogenic ability is limited, however, there exists a high-angle deep fault in the crust from Changle-Zaoan fault zone to seashore fault zone. This deep fault has cut the interface between the upper and lower crusts and Moho discontinuity, and may be the deep structure to trigger destructive earthquake source in future to affect Fuzhou City. These results have advanced the detecting precision of the deep structure in the southeastern coastal seismic zone of the mainland of china. In the aspect of the combined feature of the deep and shallow extensional structures that consist of the westward dipping low-angle normal faults and secondary normal faults on their hanging walls in the upper crust, it is firstly obtained that a united structural interpretation has deepened the knowledge about the deep dynamic process in the southeastern coasta

关键词： deep seismic reflection high-resolution seismic refraction wide-angle.

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Two-step interface and velocity inversion—— Study o e of the Tangshan seismic region

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 34-44页

作者： XIAO LING LAI XIAN KANG ZHANG XU YAO ZHENG research center of {2. {3., china Seismological Bureau, zhengzhou 450003. china

This paper studies the computation method of two step inversion of interface and velocity in a region. The 3. D interface is described by a segmented incomplete polynomial; while the reconstruction of 3. D velocity is accomplished by the principle of least squares in functional space. The computation is carried out in two steps. The first step is to inverse the shape of 3. D interface; while the second step is to do 3. D velocity inversion by distributing the remaining residual errors of travel time in accordance with their weights. The data of seismic sounding in the Tangshan Luanxian seismic region are processed, from which the 3. D structural form in depth of the Tangshan seismic region and the 3. D velocity distribution in the crust below the Tangshan Luanxian seismic region are obtained. The result shows that the deep 3. D structure in the Tangshan seismic region trends NE on the whole and the structure sandwiched between the NE trending Fengtai Yejituo fault and the NE trending Tangshan fault is an uplifted zone of the Moho. In the 3. D velocity structure of middle lower crust below that region, there is an obvious belt of low velocity anomaly to exist along the NE trending Tangshan fault, the position of which tallies with that of the Tangshan seismicity belt. The larger block of low velocity anomaly near Shaheyi corresponds to a denser earthquake distribution. In that region, there is an NW trending belt of high velocity anomaly, probably a buried fault zone. The lower crust below the epicentral region of the Tangshan M S=7.8 earthquake is a place where the NE trending belt of low velocity anomaly meets the NW trending belt of high velocity anomaly. The two sets of structures had played an important role in controlling the preparation and occurrence o

关键词： two step interface and velocity inversion 3 D velocity pattern of crust below Tangshan seismic region seismicity zone

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The Crust-mantle Structure and Seismic Risk in Tangyin Graben and Its Adjacent Area

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Earthquake research in china 1998年第4期12卷 66-76页

作者： Ren Qingfang, Zhang Xiankang, Zhang Chengke, Zhao Jinren, and Zhou Xuesong research center of {2. {3., CSB, zhengzhou 450002, china

1-D and 2.D calculation and interpretation are carried out with the DSS data from the western section of Heze-Changzhi profile and the southern section of zhengzhou-Jinan profile. 2.D velocity structure is determined in Tangyin graben and its adjacent area. The result shows that velocity structure of the crust and upper mantle is obviously different in vertical and lateral directions. Crustal thickness varies apparently in this area, and there are local low velocity blocks in the interior crust. The swelling M-discontinuity corresponds to Tangyin graben and Moho depth at the highest swelling position is 3. km. Toward the east, its depth gradually increases to 3. km in Xunxian swelling; toward the west, M-discontinuity becomes a steep zone at the piedmont uplift of Taihang Mountain and reaches 40 km at depth near Changzhi. Through analyzing the relationship between historical earthquakes and deep structure in North china, we infer that seismic risk exists in Tangyin graben and its adjacent area.

关键词： Tangyin graben and its adjacent area Crust/mantle structure Seismic risk.

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Volcanic Facies and Their Reservoirs Characteristics in Eastern china Basins

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地学前缘 2009年第S1期16卷 152-153页

作者： Chunshuang Jin~(1,2.,Dewu Qiao~2.Wenli Pan~3.1.Institute of Geology and geophysics,Chinese Academy of Sciences,Beijing 10002.,{2.. 2.Strategic {2. {3. of Oil & Gas Resources,Ministry of Land & Resources,Beijing 10003.,{2. 3.Geophysical exploration {2. Institute of Huabei Oilfield Company,Renqiu 062.52.{2.

In these years,the Upper Jurassic andesitic volcanic reservoirs in Erlian basin,the Lower Cretaceous rhyolitic volcanic reservoirs in Songliao Basin,the Cretaceous rhyolitic,and the Paleogene basaltic and trachytic volcanic reservoirs in Bohai Bay Basin,and the basaltic volcanic reservoirs in Subei basin were *** more and more volcanic oil and gas fields being discovered and developed,the volcanic rocks demonstrate a great petroleum potential in eastern basins of *** volcanic facies were identified in these basins,including volcanic conduit facies,explosive facies,effusive facies。

关键词： volcanic rocks volcanic facies reservoirs porosity types

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Oxygen and hydrogen isotopic compositions of coexistent minerals of the Tasigake alkali granite pluton,northern Xinjiang:constraints upon the cause of ^(18)O-D depletion and the ^(18)O/^(16)O exchange kinetics

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Chinese Science Bulletin 1999年第12期44卷 1086-1093页

作者： LIU Wei, ZHAO Zhenhua ZHANG Fuqin research center of Mineral Resources {2., Institute of {3. , Chinese Academy of Sciences , Beijing 100101, china Guangzhou Institute of Geochemistry, Chinese Academy of Sciences , Guangzhou 510640, china research center of Mineral Resource {2. Institute of Geophysics Chinese Academy of Science Beijing China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China

Oxygen and hydrogen isotopic compositions have been determined of three coexistent mineral triplets of alkali feldspar, quartz, arfvedsonite of 11 samples collected from the Tasigake alkali granite pluton, Ulungur River region, northern Xinjiang. Isotopic exchange with meteoric water during subsolidus cooling caused strong 18O-D depletion and the remarkable nonequilibrium 18O/16O relation between coexistent minerals. 18O/16O exchange kinetic effects of the three minerals are simultaneously and consistently modelled. Exsolution and microtextural reorganization of alkali feldspar, and infiltration of water have been mutually facilitated by each other. Shallow intrusion, and circulation of meteoric water throughout the pluton cool it effectively. As a result, the "heat engine" is rapidly extinguished, and the nonequilibrium 18O/16O relation is frosen.

关键词： 18O-D depletion isotopic exchange kinetics alkali granite Ulungur.

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The Crust-Mantle Structure in Zhangbei-Shangyi Earthquake Area

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Earthquake research in china 1999年第4期13卷 59-68页

作者： Zhu Zhiping, Zhang Jianshi, Zhang Xiankang, Zhang Chengke, Liu Mingqing, and Nie Wenyingresearch center of {2. {3., CSB, zhengzhou 450002, china

The seismic data obtained from the wide angle reflection and refraction profiles that pass through Zhangjiakou area of Hebei Province were interpreted. Some conclusions drawn from the result are as follows: (1) The nearly EW-trending Zhangbei-Chongli crustal fault zone and WNW-trending Zhangjiakou-Bohai Sea deep crustal fault zone meet in the Zhangbei earthquake (Ms = 6.2. area; (2. At the intersection, the two deep crustal fault zones that stretch to the Moho and the discontinuities of interfaces within the crust form the path for large area basalt eruption in Hannuoba; (3. In the earthquake area, the local velocity reversal in the middle-upper crust and abnormal low velocity zone in the lower crust imply that the magmatic activity there is still fairly violent; and (4) The recent activity of Zhangjiakou-Bohai Sea deep crustal fault zone may be the main cause of the Zhangbei earthquake.

关键词： Zhangbei and adjacent area crust-upper mantle velocity structure deep crustal fault wide angle reflection and refraction.

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Velocity structure and active fault of Yanyuan-Mabian seismic zone―The result of high-resolution seismic refraction experiment

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Science china Earth Sciences 2008年第9期51卷 1284-1296页

作者： WANG FuYun1↑, DUAN YongHong1, YANG ZhuoXin1, ZHANG ChengKe1, ZHAO JinRen1, ZHANG JianShi1, ZHANG XianKang1, LIU QiYuan2. ZHU AiLan2. XU XiWei2.& LIU BaoFeng1 1 Geophysical exploration center, {2. Earthquake Administration, {3. 450002, {2. 2.Institute of Geology, {2. Earthquake Administration, Beijing 10002., {2. 1. Geophysical exploration center China Earthquake Administration Zhengzhou 450002 China 2. Institute of Geology China Earthquake Administration Beijing 100029 China

The authors processed the seismic refraction Pg-wave travel time data with finite difference tomography method and revealed velocity structure of the upper crust on active block boundaries and deep features of the active faults in western Sichuan Province. The following are the results of our investigation. The upper crust of Yanyuan basin and the Houlong Mountains consists of the superficial low-velocity layer and the deep uniform high-velocity layer, and between the two layers, there is a distinct, and gently west-dipping structural plane. Between model coordinates 180-2.0 km, P-wave velocity distribution features steeply inclined strip-like structure with strongly non-uniform high and low velocities alternately. Xichang Mesozoic basin between 2.0 and 3.0 km consists of a thick low-velocity upper layer and a high-velocity lower layer, where lateral and vertical velocity variations are very strong and the interface between the two layers fluctuates a lot. The Daliang Mountains to the east of the 3.0 km coordinate is a non-uniform high-velocity zone, with a superficial velocity of approximately 5 km/s. From 13. to 150 km and from 2.0 to 3.0 km, there are extremely distinct deep anomalous high-velocity bodies, which are supposed to be related with Permian magmatic activity. The Yanyuan nappe structure is composed of the superficial low-velocity nappe, the gently west-dipping detachment surface and the deep high-velocity basement, with Jinhe-Qinghe fault zone as the nappe front. Mopanshan fault is a west-dipping low-velocity zone, which extends to the top surface of the basement. Anninghe fault and Zemuhe fault are east-dipping, tabular-like, and low-velocity zones, which extend deep into the base-ment. At a great depth, Daliangshan fault separates into two segments, which are represented by drastic variation of velocity structures in a narrow strip: the west segment dips westward and the east segment dips eastward, both stretching into the basement. The east margin f

关键词： western Sichuan high-resolution seismic refraction active fault velocity structure of the upper crust

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The Random Distribution of the Loading and Unloading Response Ratio Under the Assumptions of Poisson Models

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Earthquake research in china 2000年第1期14卷 42-52页

作者： Zhuang Jiancang and Yin XiangchuCentre for Analysis and Prediction,CSB,Beijing 10003.,china {2. {2. of {3. geophysics,CSB,zhengzhou 450002.china Laboratory of Nonlinear Mechanics, Institute of Mechanics,Chinese Academy of Sciences,Beijing 100080,china Centre for Analysis and Prediction CSBBeijing 100036China research center of {2. {3. CSB Zhengzhou 450002 China Centre for Analysis and Prediction CSBBeijing 100036China Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

This paper discussed the random distribution of the loading and unloading response ratio（LURR） of different definitions（Y1～Y5）using the assumptions that the earthquakes occurfollowing the Poisson process and their magnitudes obey the Gutenberg-Richter *** show that Y1～Y5 are quite stable or concentrated when the expected number of eventsin the calculation time window is relatively large（>40）;but when this occurrence ratebecomes very small,Y2./sub>～Y5 become quite variable or *** is to say,a high value ofthe LURR can be produced not only from seismicity before a large earthquake,but also from arandom sequence of earthquakes that obeys a Poisson process when the expected number ofevents in the window is too *** check the influence of randomness in the catalogue tothe LURR,the random distribution of the LURR under Poisson models has been calculated bysimulation.90%,95% and 99% confidence ranges of Y1 and Y3./sub> are given in this paper,which is helpful to quantify the random

关键词： Loading and unloading response ratio Poisson Model Gutenberg-Richter law Random distribution Confidence band

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Study on Crustal Structure in Haiyuan Strong Earthquake Region

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Earthquake research in china 2001年第3期15卷 230-238页

作者： Li Songlin,Zhang Xiankang,Zhang Chengke,Ren Qingfang,Shi Jinhu,Zhao Jinren,Fang Shengming,Liu Baofeng,Pan Suzhen, and Zhang Jianshi research center of {2. {3., CSB, zhengzhou 450002 , china research center of {2. {3. CSB Zhengzhou 450002 China

The crust/upper-mantle velocity structure and deep tectonic features are obtained in Haiyuan M = 8. 5 earthquake region from data processing of Xiji-Zhongwei deep seismic sounding (DSS) profile. The result shows that there is a great difference between the velocity structures on the two sides of the epicenter. The crust consists of alternative high and low velocity layers on the southern side while on the northern side it consists of a series of layers with positive velocity gradient. There exists a deep fault cutting Moho or an anomalous deep structural zone in the epicentral region.

关键词： Haiyuan earthquake Crustal structure Deep crustal fault Anomalous structural zone.

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exploration and Study on Deep Crust Structural Characteristics in the Jiashi-Artux Seismic Region

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Earthquake research in china 2003年第2期17卷 103-112页

作者： Zhao Jinren, Zhang Xiankang, Zhang Chengke, Ren Qingfang, Cheng Shuangxi, Zhang Jianshi, Nie Wenying anf Pan Shuzhenresearch center of {2. {3., china Seismological Bureau, zhengzhou 450002, china research center of {2. {3. China Seismological Bureau Zhengzhou 450002 China

The data from two deep seismic sounding profiles was processed and studied comprehensively. The results show that crust_mantle structures in the investigated region obviously display layered characteristics and velocity structures and tectonic features have larger distinction in different geological structure blocks. The boundary interface C between the upper and lower crust and Moho fluctuate greatly. The shallowest depths of C (3. 0km) and Moho (45 5km) under Jiashi deepen sharply from Jiashi to the western Kunlun mountain areas, where the depths of C and Moho are 44 0km and 70 0km, respectively. The higher velocity structures in the Tarim massif determine its relatively “stable” characteristics in crust tectonics. The phenomenon in the Jiashi region, where the distribution of earthquake foci mostly range from 2.km to 40km in depth, may infer that the local uplift of C and Moho interface, anomalously lower velocity bodies and deep large faults control earthquake occurrence and seismogenic processes in the Jiashi strong earthquake swarm.

关键词： The Jiashi earthquake region Crust-mantle structures Seismogenic background

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