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    • 1  SOME CHARACTERISTICS OF EARTHQUAKE-INDUCED LANDSLIDE IN SOUTHWESTERN CHINA
    Zhou Bengang ,  Zhang Yuming
    1994, 16(1):95-103.
    [Abstract](564) [HTML](0) [PDF 299.85 K](704) [Cited by](28)
    Abstract:
    Based on the data of the landslides caused by several historical strong shocks since l970 in southwestern China,this paper concluded the geological and geomor-phological conditions of earthquake-induced landslide In this region,and discussed the rela-tionship of landslide distribution and earthquakes. Finally,the main points on evaluating the hazards resulting from earthquake-induced landslide were also put forward in this paper.
    2  RECENT ACTIVITY CHARACTERISTIS OF THE FAULT ZONE AT NORTHERN NEDGE OF WESTERN QINLING MT
    Teng Ruizeng ,  Jin Yaoquan ,  Li Xihou ,  Su Xiangzhou
    1994, 16(2):85-90.
    [Abstract](531) [HTML](0) [PDF 451.74 K](1026) [Cited by](27)
    Abstract:
    In this paper, based on the filling active faults in geologic map with large scale in recent years,the authors present the basic activity characteristics of the fault zone at northern edge of western Qinling Mt. since late Quaternary period, and study the spatial distribution, geometry and kinematics characteristics, slip rate of fault,paleoearthquake and seismic recurrence period. The results show that the active way of the fault zone changes from compression to left-later-al slip since Quaternary period, with a horizontal slip rate 2.1-2.8mm/ year and a vertical slip rate of 0.4-0.7mm/year. The recurrence period of earthquake is about 5000 years in the fault zone.
    3  THE LATEST QUATERNARY TECTONIC DEFORMATION OF TERRACES OF JIUXI BASIN IN WEST QILIANSHAN MOUNTAINS
    CHEN Jie ,  LU Yanchou ,  DING Guoyu
    1998, 20(1):28-36.
    [Abstract](578) [HTML](0) [PDF 364.72 K](931) [Cited by](25)
    Abstract:
    The Jiuxi basin with several kilometers Cenozoic deposits in west Qilianshan mountains is located in the junction of the Tibet, Tarim and Alashan blocks. It is one of the regions which are characterized by strongly active folding and faulting with NW~NWW trend, where surface thrusts, blind thrusts and active folds are the main structural style.Tectonic deformation since early Quaternary has continued to the present time and is confirmed by warped and faulted stream terrace surfaces, and tilted flood deposits.
    When the Shiyouhe river and Baiyanghe river have cut into the cores of the anticlines in the basin, different types and numbers of terraces have developed at different sites. The warping of river terraces demonstrates that anticline growth continues.These features obviously result from the intermittent folding and thrusting of the north Qilianshan fold and thrust wedge since the late Pleistocene.
    Luminescence dating of sediments from these terraces demonstrates that the formation periods of terraces of Shiyouhe, Baiyanghe and Dahuanggou are at about 90, 70, 44, 29, 20, 13 and 5.6 ka B.P. respectively.
    Amplitude and rate of terrace uplift are estimated, which represent the cumulative uplift rates of the fold-and-thrust belts. The uplift rates are larger near by the Qilianshan mountains than far away from it.
    4  STATUS QUO AND METHOD OF QUANTITATIVE STUDY ON SOIL STRUCTURE
    QI Ji-lin ,  XIE Ding-yi ,  SHI Yu-cheng
    2001, 23(1):99-103.
    [Abstract](544) [HTML](0) [PDF 208.81 K](1014) [Cited by](23)
    Abstract:
    The conception and the significance of the soil structure are presented. The history of soil structure study is retrospected and the classification of the approach to quantitatively express the soil structure is made. On the basis of analysis of the domestic and foreign status quo of the study, it is proposed that the soil mechanics method is the most actual and effective for quantitative study of the soil structure.
    5  SATELLITE THERMAL INFRARED ANOMALY BEFORE THE XINJIANG QINGHAI BORDER MS8.1 EARTHQUAKE
    ZHANG Yuan-sheng ,  SHEN Wen-rong ,  XU Hui
    2002, 24(1):1-4.
    [Abstract](543) [HTML](0) [PDF 386.34 K](952) [Cited by](23)
    Abstract:
    The data of thermal infrared remote sensing of Lanzhou receiving station from meteorological satellite on northern Tibet plateau(34°~38° N, 86°~94° E), in three month before Nov. 14, 2001 MS 8.1 earthquake at Xinjiang-Qinghai border are calculated, analyzed and researched. The results shows that obvious belt anomaly of the earth's surface temperature appeared from on Oct. 17, 2001, the anomalous area became more large and with migration phenomena. The whole anomalous time kept on near one month.
    6  ACTIVITY OF THE YUMEN FAULT,WESTERN QILIAN MOUNTAINS,DURING LATE QUATERNARY AND ITS IMPLICATION TO REGIONAL TECTONIC MOVEMENTS
    CHEN Wen-bin ,  LIU Bai-chi ,  XU Xi-wei ,  DAI Hua-guang ,  WANG Feng
    1999, 21(4):389-394.
    [Abstract](487) [HTML](0) [PDF 248.33 K](1146) [Cited by](20)
    Abstract:
    Field investigation reveals that the latest time when Yumen fault, western part of Qilian Mountains was active is the end of the late Pleistocene, and that the fault is coincident with other faults around west Jiuquan basin.It is also found that Yumen fault had not simply restricted to dip-slip motion, strike slip motion is indicated. The results suggest that west Jiuquan basin block might have rotated clockwise.
    7  RESEARCH ON SLIP RATES OF THE LENGLONGLING ACTIVE FAULT ZONE
    HE Wen gui ,  LIU Bai chi ,  YUAN Dao yang ,  YANG Ming
    2000, 22(1):91-98.
    [Abstract](595) [HTML](0) [PDF 219.18 K](622) [Cited by](20)
    Abstract:
    Based on data of field investigation in major area of Lenglongling fault zone,geometric characteristics and slip rate of the fault zone are studied.The results show that the fault zone is an active one in Holocene and consists of a group of secondary faults.According to its total characteristic,the fault zone can be divided into 3 segments.The average left lateral horizontal slip rates of the fault zone since middle Pleistocene are calculated.The horizontal slip rate in middle Pleistocene is 2.14~4.64 mm/a,the rate in Epipleistocene is 2.86~4.07 mm/a,the rate in Holocene is 3.35~4.62 mm/a.The vertical slip rate is 0.38 mm/a since Holocene.
    8  PREPARATORY FIELD INVESTIGATION ON THE SURFACE DEFORMATION ZONE OF THE QINGHAI-XINJIANG MS8.1 EARTHQUAKE ON NOV.14, 2001
    CHEN Wen-bin ,  XU Xi-wei ,  ZHANG Zhi-jian ,  CHEN Yong-ming ,  HE Wen-gui ,  LIU Hong-chun ,  DAI Hua-guang ,  Lu Ming
    2001, 23(4):313-317.
    [Abstract](559) [HTML](0) [PDF 405.65 K](978) [Cited by](20)
    Abstract:
    Preparatory field investigation reveals that the surface deformation zone of the Qinghai-Xinjiang MS 8.1 earthquake on November 14, 2001 distributes along the south foot of Kunlunshan mountains, and may terminate at the Bugedabanfeng as the western end while the eastern end is tracked down at the point 70 km east from the Qinghai-Xizang Raod.The total length of the deformation zone reaches 350 km.The deformation shows clear strike-slip feature and the maximum horizontal offset is found to be 6 m.It was temporarily determined that the macro-epicenter is 30 km east from the Kusaihu lake, and the intensity in the macro-epicenter is Ⅺ.It's suggested that the earthquake be named as Kusai hu earthquake.
    9  ANALYSIS ON THE SATELLITE INFRARED ANOMALY FEATURE BEFORE WEST TO KUNLUN MOUNTAIN PASS M 8.1 EARTHQUAKE
    KANG Chun-li ,  CHEN Zheng-wei ,  CHEN Li-ze ,  TIAN Qin-jian ,  LIU De-fu
    2003, 25(1):12-15.
    [Abstract](634) [HTML](0) [PDF 447.08 K](866) [Cited by](18)
    Abstract:
    Based on the two products of infrared from satellite remote sensing, i.e.. Outgoing Longwave Radiation (OLR)and Bright Temperature(BT), the precursor anomaly feature of infrared radiation before west to Kunlun Mountain Pass M 8.1 earthquake on Nov. 14, 2001, is analyzed. The result shows that the increasing anomaly of OLR appeared since a month and BT since a week before the earthquake, and both anomalies stretched along the seismo-tec-tonic zone in the epicenter district.
    10  FRACTAL ANALYSIS APPLIED TO HAIYUAN ACTIVE FAULT SYSTEM
    Zhou Jin
    1991, 13(3):78-85.
    [Abstract](450) [HTML](0) [PDF 502.05 K](969) [Cited by](17)
    Abstract:
    Based on the covering dimension method for measuring the San Andreas fault system applied by P.G.Okubo,the fractal behavior of Haiyuan Quaternary active fault system has been investigated.The fractal dimensions for the entire fault system and its two of the four segments,Jingtai and Haiyuan,are obtained,i.e.DQB=1.137,DOJ=1.109 and DOH=1.182.The fractal dimensions for the other two segments,Shaojiashui and Lijunpu,aren't obtained,so the SL segments are self-affine or nonlinear fractals rather than self-similar ones.It.may be seen that the real seismic faults are more complicated than ideal ones,should be multifractals or self-affine.Basides.the correlation between fault geometry and seismicity,mechanical circumstance around the fault system has been emphatically discussed.It further proves that the geometry complexity of self-similar faults is close to seismic activity;shear faults have lower fractal dimensions (1.1-1.3);but the fault systems formed in tensional circumstance have higher fractal dimensions (1.5-1.6).Finally,this paper discussed the effect of fault trace map,etc.on the measuring accuracy of fractal analysis.
    11  APFLICATION OF THE GENETIC ALGORITHM TO SEISMIC LOCATION
    ZHOU Min-du ,  ZHANG Yuan-sheng ,  ZHANG Shu-xun
    1999, 21(2):167-171.
    [Abstract](543) [HTML](0) [PDF 420.52 K](503) [Cited by](17)
    Abstract:
    The genetic algorithm is applied to seismic location, and its results are compared with those of Powell algorithm and traditional algorithm. It is shown that when genetic algorithm is used, the precision of determined origin time is higher and the determined depth is more reliable. This method is better when the stations concentrate on one side of an earthquake.
    12  FILTERING BASED ON WAVELET PACKET TRANSFORM
    LIU Xi-qiang ,  ZHOU Hui-lan ,  ZHENG Zhi-zhen ,  SHEN Ping ,  YANG Xuan-hui ,  LI Hong
    1999, 21(3):248-253.
    [Abstract](673) [HTML](0) [PDF 327.98 K](800) [Cited by](17)
    Abstract:
    Wavelet packet transform is further expansion of wavelet transform theory. Signals may be decomposed into different frequency section by wavelet packet transform method. Emulation study results show that wavelet packet transform has a series of good characteristics while other analysis methods do not have. The method is a very effective filtering method.
    13  THE BASIC CHARACTERS AND FORMATION MECHANISM OF SATELLITE INFRARED ANOMALIES BEFORE STRONG EARTHQUAKES
    XU Xiu-deng ,  XU Xiang-min
    2001, 23(3):310-312.
    [Abstract](484) [HTML](0) [PDF 148.32 K](765) [Cited by](17)
    Abstract:
    Analysing thermal infrared anomaly images before earthquakes more than 40 in China and its neighboring areas, the main features of the infrared anomalies are summarized.In general, there exist clearer anomalies with a bigger amplitude of temperature increase which show the character of suddenness and phase before MS >5 earthquakes.Abnormal area is related positively to magnitude with a certain degree.Some studies on mechanism of the infrared anomaly are introduced and the author's trend opinion is put for ward.It is believed that the polarizing function of air static electric field anomaly to the atmosphere impending before earthquake should be the major factor to the infrared anomaly.And "the greenhouse effect" of the atmosphere containning abundant "polluting air" should be another factor that can not be ignored.
    14  RELATIONSHIP BETWEEN DYNAMIC ANOMALIES OF GROUND FLUID AND LOCAL STRUCTURES
    SHAO Yong-xin ,  LI Jun-ying ,  LI Yi-bing ,  TIAN Shan
    2000, 22(3):284-287.
    [Abstract](489) [HTML](0) [PDF 174.88 K](719) [Cited by](16)
    Abstract:
    Relationship between the dynamic anomalies of groundwater in northern part of North China as well as dynamic anomalies of oil wells in Liaohe,Dagang,Shengli and Huabei oil fields and local structures is studied.The results show anomalous shapes of groundwater and dynamics of oil wells before earthquakes are not only related to the regional structures,but also closely related to local structures.The anomalies are positive in upheaval area and are negative in depression area.
    15  STUDY ON MANY KINDS OF PRECURSORY ANOMALIES AND TRIAL PREDICTION OF STRONG EARTHQUAKES IN THE CONTINENT OF CHINA
    DU Xue-bin ,  REN Guang-jun ,  XUE Shun-zhang
    1999, 21(2):113-122.
    [Abstract](514) [HTML](0) [PDF 913.38 K](841) [Cited by](15)
    Abstract:
    The time-space evolutions of the short-impending anomalies of the five kinds of precursors which include geoelectricity,hydrochemistry, ground water behavior, ground stress and ground de-formaticn around a strong earthquake are depended upon the active master structures and the gen-erating-earthquake mechanism.The evolutions of the far-field abnormalities of the precursors are related to the structures and the abnormalities at different structures have the diversity of evolu-tional time. In some particular years one-year scale anomaly of earth resistivity demonstrates the anomaly fastigiums which are synchronous with the years when energy of Ms≥5.0 earthquakes is up to that of a Ms=7.0 earthquake or are delayed one year. The fastigiums and the years are fairly corresponding to the years of the acceleraticn of the earth rotation. According to the research results of the two respects, 12 strong and moderate earthquakes are predicted so that 10 shocks of them occurred in the predicted area and the predicted time interval (a half year or one year time interval).The sites of seven shocks are basically exactly predicted and those of three shocks are fairly exactly done.
    16  ANISOTROPIC PORO-ELASTICITY MODEL AND EARTH RESISTIVITY PRECURSOR
    RUAN Ai-guo ,  LI Qing-he ,  ZHAO He-yun
    2000, 22(3):209-216,223.
    [Abstract](568) [HTML](0) [PDF 418.50 K](857) [Cited by](15)
    Abstract:
    The latest development of APE theory for anisotropy study is introduced and applied in electric problem s.In the view of APE cracks modeling,it is believed that when there is no newly developed cracks,the dilatancy and closing of cracks balance each other.Using a new electric conductivity anisotropic model (named cubic model),put forward by present authors,for the cracked rocks containing fluid,the mechanism of earth resistivity precursor of earthquake is discussed according to the APE theory,considering the variation of aspect ratio to be the main source of the precursor due to stress change.It is concluded that the increasing or decreasing variation of earth resistivity with large amplitude before strong earthquakes could be explained easily by the new electric anisotropic model,even if the total porosity or strain do not change or there are no new cracks developed.Moreover,it is found that resistivity variation characteristics are related to the aspect ratio and distribution of cracks.But the conclusions from the discussion in this paper are effective only for seismic field precursor,not for source precursor related to new developed cracks.
    17  The Inversion for Source Parameters and Site Effect in Midwest Area of Inner Mongolia
    GAO Li-xin ,  ZHENG Si-hua ,  DING Feng-he
    2005, 27(2):109-114.
    [Abstract](899) [HTML](0) [PDF 327.80 K](1169) [Cited by](15)
    Abstract:
    In this paper,the quality factor （Q） and the non-elasticity attenuation cofficient c（f） in Midwest area of Inner Mongolia are calculated using data of nine events recorded by 7 stations of hohhot digital seismic net based on genetic algorithm and Atkinson method. In the scope of studying frequency ,the correlation of the non-elastlcity cofficient c（f） and frequency f is not obvious,but the quality factor Q and frequency f have good linearity connection ： Q（ f）= 116. 8f^1.000 Meanwhile,the source parameters are inverted by using Moya toothed, and the relationships between the source parameters are discussed. The result shows that the correlation of the source parameters has good linerity connection . The site effects for seven stations are also obtained by GA and the Moya methods from nine earthquakes,the result shows there is the amplification at the rock sites in the whole frequency band. The principium and approach of the Atkinson and Moya methods are introduced in this paper.
    18  Electrical Characteristics of Buried Fault and Prospecting  by Superficial Direct-current Electrical Method
    WANG?Ai-guo ,  MA?Wei ,  ZHANG?Xiang-hong ,  LIU?Yu
    2006, 28(3):242-247.
    [Abstract](784) [HTML](0) [PDF 374.10 K](960) [Cited by](15)
    Abstract:
    The electrical characteristics of buried fault in different environment, and the curve shape of resistivity composite profile for different kinds of fault. The process of buried fault prospecting by superficial direct-current electrical method is illustrated by real some cases. The results show that superficial direct-current electrical method is valid to the detecting of some kind of buried fault but the prior knowledge is very important and is the key to the efficiency of prospecting and the interpretation of result.
    19  A TEST METHOD OF DYNAMIC STRENGTH OF LOESS UNDER RANDOM SEISMIC LOADING
    Wang Lanmin ,  Zhang Zhenzhong ,  Wang Jun ,  Li Lan
    1991, 13(3):50-55.
    [Abstract](469) [HTML](0) [PDF 437.91 K](483) [Cited by](14)
    Abstract:
    In this paper, by use of an APPLE-Ⅱ microcomputer controling a dynamic triaxial apparatus made at home, the dynamic strength tests are directly performed on a loess by employing random time histories of seismic load. The method of determining the dynamic strength of loess under the seismic loading from relation curves of dynamic stress and residual strain was presented. And then, the Huihuichuan loess landslide induced by the 1920 Haiyuan earthquake (Ms=8.5) is inverted, and the inverted result coincides with the real seismic damase.
    20  UTILIZING DIRECT INTEGRATION TO ENHANCE CALCULATION ACCURACY OF 1D ELECTROMAGNETIC RESPONSE FOR CURRENT DIPOLE SOURCE
    WENG Ai-hua ,  WANG Xue-qiu
    2003, 25(3):193-197.
    [Abstract](575) [HTML](0) [PDF 219.17 K](933) [Cited by](14)
    Abstract:
    The direct integration method to enhance the calculation accuracy of electromagnetic responses for current dipole source over layered earth is discussed. In the method Hankel integration in frequency domain is divided into several partial ones and are evaluated with the method which combines Gauss quadrature rule and continued fraction. The utility of continuous fraction can speed up the convergence greatly. Using the method the electromagnetic responses for half-space and two-layered earth models are tested. Compared with traditional numerical filter method, the result shows that the direct integration technique can improve the frequency response simulation accuracy of electromagnetic soundings for 1D earth, and gives calculating base of obtaining the very late time electromagonetic responses with high accuracy.

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