• Volume 8,Issue 4,1986 Table of Contents
    Select All
    Display Type: |
    • THE NON-LINEAR PERIOD OF COMPLEX FOCUS PRIOR TO LARGE EARTHQUAKES AND THE PREDICTION OF EARTHQUAKES

      1986, 8(4):1-8.

      Abstract (540) HTML (0) PDF 568.18 K (707) Comment (0) Favorites

      Abstract:This paper applies the non-stationary phenomenon coming out within the system before the sudden change of phase state in modern statistical physics to the study of earthquake prediction.It is obtained that the ratio between T,the preparation time of large earthquakes,T1,the interval of elastic strain and T2,the non-linear strain interval,which is respectively set around 5 and 4.This ratio has nothing to do with the way of focus fracture,the difference of medium strength and the difference of tectonic movement rate.So it can be used as the critical index of shallow earthquakes,and it is of the properties of universal constant,available for the earthquakes in different areas.By means of this ratio and T1,T2,determined by seismometry,the mid long-term forecasting of earthquakes can be done.In addition,two formulas between T,the preparation time of earthquake and magnitude are also obtained,which respectively correspond to the different areas with the different rate of tectonic motion.
      M1=4.2+1.5logT (1)
      M2=5.8+1.2logT (2)
      Formula (1) can be used in the areas where the rate of tectonic motion is high,and (2) used in the common areas.In the above formulas,T is in the unit of year.These two formulas can contribute to the preliminary long-term prediction of earthquakes.

    • THE CHARACTERISTICS OF SEISMIC WAVE PROPAGATION IN THE COMMON RHEOLOGICAL MEDIUM MODEL

      1986, 8(4):9-19.

      Abstract (508) HTML (0) PDF 694.25 K (486) Comment (0) Favorites

      Abstract:In this paper, a common rheological medium model is used.The characteristics of seismic wave propagation in the medium is studied in detail.Lastly,the displacement fieled produced by quasi-static dislocation in the medium and Q-factor of the crust is discussed.

    • THE EFFECT OF SEISMIC HYDROGEOLOGY OF THE TIANSHAN EARTHQUAKE ZONE,XINJIANG

      1986, 8(4):20-25.

      Abstract (509) HTML (0) PDF 432.49 K (661) Comment (0) Favorites

      Abstract:In the Tianshan region, the high pressure artesian water, high pressure oil-gas deposits and exposure of terrestrial heat anomalus area which are consistent with the distribution of the TianShan earthquake zone indicate that the dynamic condition of pore water pressure with high anomaly is likely to be an important machanism for triggering shallow focus earthquake. Based on many events, it can be considered that underground fluid has two kinds of anomalies before moderate and strong earthquakes in the TianShan earthquake zone. The first is the tendency anomaly during accumulated stage of stress-strain energy:The second is the abrupt anomaly of impending earthquake during pre-reteased stage of stress-strain energy. These two anomalies are entirely different in shape and time-space distribution, and show two quite different, physical and chemical processes during earthquake pregnant process. The seismic precursor components of fluid have own characteristics in different active zones. During the seismicity of the TianShan earthquake zone, the water level, petroleum amount, radon, conductance, and its gaseous components such as H2S, CH4 and CO2 always appear anomalous.
      We predicted the Bogeda earthquake (Ms=5.3)on June 1.1983 by means of these two anomalies characteristics of the fluid components. This prediction was based on the synthetic observation and study of synthetics with many terms and components, it's perhaps important way to raise the research level of earthquake prediction for underground fluid.

    • APPLYING THE PATTERN RECOGNITION FOR THE RESEARCH OF COMPREHENSIVE EARTHQUAKE PREDICTION

      1986, 8(4):26-31.

      Abstract (551) HTML (0) PDF 423.02 K (391) Comment (0) Favorites

      Abstract:In this paper, the principle of the pattern recognition and its practicability in comprehensive earthquake forecasting research has been discribed we take the North China area and North west area as examples to extract the precursory features of the moderate-strog earthquakes occurred in these two areas. According to the calculated results, we forecast that an earthquake with magnitude 6 will strike the boundary ares(37°-38°N101.-102°E)of Gansu and Qinghai provinces in two years.

    • DISCUSSION ON THE GENESIS OF M=6.4 YANGJIANG EARTHQUAKE IN 1969

      1986, 8(4):32-36.

      Abstract (735) HTML (0) PDF 326.79 K (450) Comment (0) Favorites

      Abstract:This paper deals with the seismic genesis of M=6.3 Yangjiang earthquake in 1969 bymeans of the situation when the quake occurred, its focus geological background and epigene adjustment action.
      This earthquake mentioned in the paper occurred along NEE fault, with strike slip fault shifting and stronger P wave emission in the direction of S by W. But then the regional tectonic pressure acted upon the fault was of the SEE trending, and at the same time, it was overlapped by a vertical force exerted upon the seismic focus bottom.
      This paper analyses the geological background in the seismic area and points out that the seismic stress accumulative unit length was 40 km and the focus was formed by the forces mentioned above.M=6.4 earthquake was generated owing to the focus stress accumulation and focus modulation by epigene adjustment action. After earthquake, the fault upper wall was down-punched, resulting in the submergence of ground in the epicentral area and increase of inclined slip component of aftershock meshanism.

    • INFLUENCE OF BAROMETRIC PRESSURE ON GRAVIMETERS AND CORRECTION TO OBSERVED DATA OF LTWGN

      1986, 8(4):37-42.

      Abstract (545) HTML (0) PDF 353.98 K (641) Comment (0) Favorites

      Abstract:In this paper, the process as wall as the results of the barometrical pressure test performed in Wuhan in Oct. 1984 for the three gravimeters(C-327, w-1143, w-1210)has been given, and the barometrical pressure correction to the observed gravity of the Lanzhou-Tianshui-Wudu Gravity Net (LTWGN)has been estimated. The results of the test for the three gravimeters are k327=0.816, k1143=1.013, k1210=3.434(ugal/mmHq)respectively. Based on the data obtained from the barometric pressure correction, the possible effect of this correction is discussed.

    • A PRELIMINARY STUDY ON THE CRUSTAL THICKNESS IN SHANXI REGION

      1986, 8(4):43-51.

      Abstract (499) HTML (0) PDF 493.80 K (928) Comment (0) Favorites

      Abstract:From the data of 7 artificial explosions and 10 moderate strong earthquakes of nearby regions recorded by the Shaanxi Seismic Network and also the data of head wave pn from Moho, the time-term bi and vpn for each observation spot and the crustal thickness beneath 40 observation sots are determined by use of the improved time-term method[1] and relative time-term method[3],[4]. Generally speaking, the crustal thickness in Shaanxi region is thinner in the east and thicker in the west. The crust in northern Shaanxi is relatively thick, about 41-43kin. For faulted regions in the Qinling Mountains, it is about 40 kin. The crust in the weihe Basin is relatively thin, about 36 km on ae average. The results suggest that there exist a certain relation between deep crustal structure and seismic activity.

    • A RESEARCH ON SEISMOLOGICAL INFORMATION DATABASE

      1986, 8(4):52-59.

      Abstract (534) HTML (0) PDF 521.53 K (638) Comment (0) Favorites

      Abstract:Establishing an on-line retrievable journal paper database of seismology, these journals are published in China. Using VAX11/750 mini-computer, its operation system is VAX/VMS and VAX Datatrieve, VAX Common Data Dictionary software products. There are three file-structured databases, domain names are Papers, Subject Abstract, in this journal paper database of seismology. A record of Papers, Subject, Abstract is 1500, 225, 1281 bytes long, respectively. on-line retrieval programs are interactive mode, designed by myself. They are convenient to users. Retrospective time of this database is planning on going to ten years or more.

    • INERTIAL MODE OF MHD WAVE IN THE EARTH'S CORE

      1986, 8(4):60-69.

      Abstract (607) HTML (0) PDF 482.36 K (454) Comment (0) Favorites

      Abstract:The outer core of the earth, being in the plasma state with high temperature, high pressure, high density, and immersed in a strong toroidal magnetic field, can support varieties of plasma waves. Under influene of earth rotation, MHD wave propagates alone field lines in two modes; eastward inertal mode and westward magnetic mode, both are characterized dy high dispersion. The magnetic mode is related with the secularvariation and westward shift of the main magnetic field. The inertial mode has periods of the order of days, its magnetic effects would be shielded from the earth's surface dy conductive mantle. However, the mechanical couplins between the core and the lower mantle would be possidle, hence a periodic mechanic process would de produced by MHD wave in the earth's core.

    • >短文
    • A NEW PHYSICAL MODELLING METHOD FOR GEOELECTRIC SURVEY

      1986, 8(4):70-73.

      Abstract (465) HTML (0) PDF 263.30 K (431) Comment (0) Favorites

      Abstract:地震预报中的地电法观测研究已经普遍开展,並取得了一定的效果。但是,由于震源区孕震环境的复杂性以及干扰因素的多样性,人们需要了解地电台址下勘探体积内电阻率的分层情况,从而设法从自然正常的背景值上分离出地震前的地电信息。

    • SYNCHRONOUS MICROTREMOR AT XINGTAI AND HECHENG OLD SEISMIC AREAS AT THE INITIAL STAGE OF THE TANGSHAN LARGE EARTHQUARE

      1986, 8(4):74-76.

      Abstract (507) HTML (0) PDF 188.00 K (391) Comment (0) Favorites

      Abstract:1976年7月28日唐山7.8级地震后,从对观测资料的分析中作者发现了一种特殊现象:在邢台地区的红山地震台记录到唐山大震区的强余震后10小时之内,邢台地区发生的小震的初动方向与唐山强余震有很好的一致性。

    • PRELIMINARY STUDY ON THE INITIAL FUNCTION OF P WAVE MEASURED BY MODEL 64 SEISMOMETER IN HEXIBAO STATION

      1986, 8(4):77-81.

      Abstract (542) HTML (0) PDF 321.66 K (607) Comment (0) Favorites

      Abstract:在我国,对于远震的研究,多数采用基式(SK)仪的面波震级,並有一套比较完善的震级起算函数。但是,对于64型仪器却没有相应的震级起算函数,而借用古登堡-里克特的体波震级的起算函数,因此有必要对该仪器的震级起算函数进行研究。

    • EARTHQUAKE SOURCE MECHANISMS OF MENYUAN EARTHQUAKE (Ms=6.4,on Aug.26,1986) AND ITS STRONG AFTERSHOCKS

      1986, 8(4):82-84.

      Abstract (1079) HTML (0) PDF 214.26 K (528) Comment (0) Favorites

      Abstract:1986年8月26日17时43分在甘青交界的青海门源北(北纬37°42',东经101°34')发生了一次6.4级地震。随后,在主震周围100公里范围内发生了一系列的余震。到9月底为止,据初步统计该区内共发生大小余震达700次。

    • >研究报导
    • THE MEANING OF THE GOLD SECTION NUMBER IN DISASTER SCIENCE

      1986, 8(4):85-86.

      Abstract (606) HTML (0) PDF 161.52 K (418) Comment (0) Favorites

      Abstract:众所周知,黄金分割数是指把一个线段分为不等的两小段,这两小段分别与总线段长度之比为0.618和0.382,另外这两小段相互之比也是0.618,这个数即为黄金分割数。关于0.618的实用价值,华罗庚在推广优选法时曾作了评价,但其广泛的意义还远远未被揭示。

    • >动态评述
    • THEORY,APPLICATION AND DEVELOPMENT OF SEISMIC TOMOGRAPHY

      1986, 8(4):89-96.

      Abstract (515) HTML (0) PDF 675.62 K (458) Comment (0) Favorites

      Abstract:CT技术同遗传工程、新粒子发现和宇航技术一起被称为七十年代四大科技重要成果[1,2]。这项重要的科技成果已经成功地应用到医学、射电天文学、核磁共振、显微技术、无损检测、磁流体力学、物质结构、化学和地球物理学等许多领域中,並先后于1979年获得诺贝尔医学奖金(Cormgck和Hounsfiëld),于1983年获得诺贝尔化学奖金(Klug)。

Current Issue


Volume , No.

Table of Contents

Archive

Volume

Issue

Most Read

Most Cited

Most Downloaded