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地幔对流     
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  mantle convection
     Two-dimensional numerical simulation with a given temperature field and negative buoyancy indicates that:(1) the mantle convection drag force plays an important control role to subducted depth and subducted rate. Its change from 100 MPa to 20 MPa results in decreases of the subducted depth from 231 km to 151 km and subducted rate from 10.79 mm/a to 5.46 mm/a;
     利用考虑温度场和负浮力的二维数值模拟表明:(1)地幔对流拖曳力对俯冲深度和俯冲速度有重要控制作用,从100MPa 到20MPa 的变化将导致俯冲深度由231km 减到151km,速率由10.79mm/a 减到5.46mm/a。
短句来源
     Variable Viscosity Whole Mantle Convection and Surface Plate Motions
     全球变粘度地幔对流与地表板块运动
短句来源
     The diverse geographic distribution of high and low 3He/ 4He OIB infers the complex hemispheric asymmetry patterns of global mantle convection.
     3 He 4 He值OIB地理分布的非均匀性反映出全球地幔对流系统复杂的半球非对称性格局。
短句来源
     ④The formation of inorganic CO_2 reservoir included mainly some contacted processes,which include Pacific tectonic plate subduction and withdraw, asthenosphere depleted mantle convection upwelling, mantle-source basalts magma forming, lithosphere extensional attenuating, extension fracture systems forming, CO_2 migrating and accumulating.
     ④无机CO_2 气藏的成藏模式主要包括太平洋板块俯冲后撤、软流圈地幔对流上涌、幔源玄武岩浆形成、岩石圈伸展减薄、张性断裂系统形成、CO_2气运移、圈闭成藏等几个有机联系的过程。
短句来源
     Numerical experiment is a basic method in the study of Earth's mantle convection.
     数值实验是地幔对流研究的基本方法。
短句来源
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  mantle flow
     Effects of mantle flow on generation and distribution of global lithospheric stress field
     地幔对流对全球岩石圈应力产生与分布的作用
短句来源
     The model of tomography can show the phenomena of slab diving and upwelling, so it is important to attain the trend and velocity of mantle flow based on tomography.
     但是层析成像模型仅仅给出速度分布图像,没有解决地幔对流规模问题,为了更进一步了解地球内部动力学过程,利用地震层析成像精细三维速度结构来研究地幔流的流动趋势以及速度大小具有重要的意义。
短句来源
     It is consistent with the results obtained from other data. The possible mechanism is lithosphere plate motion and mantle flow.
     这与用其它资料分析的结果一致 ,可能的机制是岩石圈板块运动和地幔对流
短句来源
     We apply a kinematic simulation method to perform modeling for the global lithospheric stress field induced by mantle flow.
     利用动力学模拟方法研究地幔对流对于大尺度岩石圈内部应力场形成的作用.
短句来源
  mantle convective
     Using the geopotential coefficents presented by GEM10B and the equations for mantle convective stress, the mantle convection pattern under the lithosphere of China and environs is computed.
     本文利用GEM10B卫星重力模型提供的位系数及地幔流应力方程,计算了中国及邻区岩石圈底面的地幔对流应力。
短句来源
  mantle circulation
     COUPLING BETWEEN MANTLE CIRCULATION AND LITHOSPHERIC PLATES──(Ⅰ)THERMAL FREE CONVECTION IN A SPHERICAL SHELL
     地幔对流与岩石层板块的相互耦合及影响──(Ⅰ)球腔中的自由热对流
短句来源
     COUPLING BETWEEN MANTLE CIRCULATION AND LITHOSPHERIC PLATES:(II)THE MANTLE's MIXED CONVECTION MODEL AND ITS APPLICATION TO EXPLANATION OF PLATE VELOCITY FIELD
     地幔对流与岩石层板块的相互耦合及影响──(Ⅱ)地幔混合对流理论及其应用
短句来源
     A tentative analysis of the mechanism of mantle circulation flow, continent drifting and earthquake origin is first clearly made, giving a simple mechanics-based explanation of the nature.
     首先对地幔对流、大陆漂移和地震起源的机制做了尝试性分析,给出一个简单的力学解释。
短句来源

 

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      mantle convection
    We obtained the pattern of mantle convection for East Asia and the West Pacific.
          
    The three regions of mantle convection beneath East Asia and the West Pacific are in accordance with the West Pacific, Ancient Asia and the Tethyan structure regions.
          
    Numerical simulation in recent years has revealed that the cold lithosphere, whose viscosity is three to four orders of magnitude higher than that of the underlying mantle, behaves during mantle convection as a stagnant lid.
          
    Exact analytical solutions of the stokes equation for testing the equations of mantle convection with a variable viscosity
          
    Geomagnetic reversals in the paleozoic: A transitional field, polarity bias, and mantle convection
          
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      mantle flow
    Vertical velocity of mantle flow of East Asia and adjacent areas
          
    Based on the high-resolution body wave tomographic image and relevant geophysical data, we calculated the form and the vertical and tangential velocities of mantle flow.
          
    Some important results and understandings are gained from the images of the vertical velocity of mantle flow for East Asia and the West Pacific.
          
    The velocities of the vertical mantle flow are about 1-4 cm per year and the tangential velocities are 1-10 cm per year.
          
    The mantle flow has an effect on controlling the movement of plates and the distributions of ocean ridges, subduction zones and collision zones.
          
    更多          
      mantle convective
    Enriched material was supplied into the deep-seated zones of silicate shell through delamination of subcontinental lithospheric blocks affected by mantle metasomatism and their subsequent involvement in the mantle convective system.
          
    The upper-mantle convective flow in the direction of the Indian Plate's motion was the main cause of the crustal deformation.
          
      mantle circulation
    In this paper, mantle circulation flow, continental drift, earthquake origin and other mechanical principles are examined as they apply to earthquake engineering, seismology and dynamics of fluid saturated porous medium.
          
    Effect of a Viscosity Interface at 1000 km Depth on Mantle Circulation
          
    A mantle circulation induced by the heterogeneities is modelled by solving the Stokes problem for incompressible Newtonian fluid.
          
    For large values of this ratio, the background mantle circulation has little effect on the plumes.
          
    Thus, there exists a dynamical connection between this deep mantle phase transition and upper mantle circulation in our model.
          
    更多          


    The third paper outlines the rapid advances of world-wide studies in the models of mantle convec- tion and subcrustal stress fields througth inversion of landsat gravimetric data collected in the recent 20 years.The paper presents the theoretical basis of the inversion technique and observation facts,dis- cussing the relationship between the subcrustal stress fields and the distribution of geological structures, earthquake activity,volcanoes and mineral deposits.The distribution of the suberustal stress fields...

    The third paper outlines the rapid advances of world-wide studies in the models of mantle convec- tion and subcrustal stress fields througth inversion of landsat gravimetric data collected in the recent 20 years.The paper presents the theoretical basis of the inversion technique and observation facts,dis- cussing the relationship between the subcrustal stress fields and the distribution of geological structures, earthquake activity,volcanoes and mineral deposits.The distribution of the suberustal stress fields and the relation of the subcrustal stress field to the seismogenic model of Tangshan earthquake are also elaborated.

    地壳上地幔的应力场问题,是固体地球物理学、地质学和地震学等研究领域中的最基本问题。近十几年来,随着空间探测技术的发展,在应用卫星重力数据反演地幔对流模式和壳下应力场方面的研究进展很快,汇编介绍如下:

    We have applied the harmonic coefficients of Earth's gravity field from satellite measurements and hydrodynamical equations for the earth mantle and calculated three mantle convection models: model Ⅰ, complete field (2-30 degree); model Ⅱ, higher field and model Ⅲ, lower field. To choose an appropriate one from the three models, we compared them with the focal mechanism solutions for 131 earthquakes (1961-1977, M≥5) and the features of recent tectonic movements in China. The results show that model I is better...

    We have applied the harmonic coefficients of Earth's gravity field from satellite measurements and hydrodynamical equations for the earth mantle and calculated three mantle convection models: model Ⅰ, complete field (2-30 degree); model Ⅱ, higher field and model Ⅲ, lower field. To choose an appropriate one from the three models, we compared them with the focal mechanism solutions for 131 earthquakes (1961-1977, M≥5) and the features of recent tectonic movements in China. The results show that model I is better consistent with geophysical and geological observation data than model Ⅱ and model Ⅲ.

    本文应用卫星测量地球重力场的球谐函数系数和地幔流体力学方程,计算了中国地区岩石层下的地幔对流状态。计算中选用了三种不同的模式:模式Ⅰ,完全场(2—30阶);模式Ⅱ,高阶场(13—25阶);模式ⅢI,低阶场(4—18阶)。其目的是探求一种与我国地质和地球物理实测资料相符合的最佳模式。考虑到岩石层厚度与所假定的地幔对流区厚度相比是很薄的,因而可以把地幔流对岩石层底面产生的拖曳力近似地看作岩石层内构造力。将上述三个模式分别与中国及邻区的131个地震(1961—1977,M≥5)震源机制解和近代地质构造形变等资料进行比较。结果表明,模式Ⅰ与我国大多数地区的实测资料符合得最好,该模式所显示的地幔对流特征与相应各地区近代构造运动特点相符。模式Ⅰ为探讨近代构造运动的力源问题,提供了新的线索。

    In this paper the geopotential harmonic coeffients derived from satellite tracking by Wagner are studied and divided into two parts: one with n≤11, correlated with large-scale mantle convection; the other with 12≤n≤25,correlated with small-scale convection. The subcrustal stress field caused by mantle convection under the study region has been obtained, which is a regular symmetrical compressional stress field, with a compressive field central at. the Linfen-Hondon area (111.5°E; 36°N). The magnitude of stress...

    In this paper the geopotential harmonic coeffients derived from satellite tracking by Wagner are studied and divided into two parts: one with n≤11, correlated with large-scale mantle convection; the other with 12≤n≤25,correlated with small-scale convection. The subcrustal stress field caused by mantle convection under the study region has been obtained, which is a regular symmetrical compressional stress field, with a compressive field central at. the Linfen-Hondon area (111.5°E; 36°N). The magnitude of stress for this region is about 0.2-0.75×108dyn. cm-2.The pattern of the epicentral distribution for major shocks and the focal mechanism solutions are almost similar to those of the subcrustal stress field, especially for Tangshan and Haicheng earthquakes.It is concluded that the subcrustal stress field caused by small-scale mantle conyec-tion controls seismic activities,even those strong quakes that occurred in the study region at high tide, recently.

    本文分析了魏格纳等求得的重力位球谐系数,得出n≤11阶系数与大尺度地幔对流相关,而12≤n≤25阶系数反映小尺度地幔对流;计算了小尺度地幔对流引起的华北地区壳下应力场,该应力场具有挤压性质,挤压中心在山西临汾—洪洞一带(111.5°E;36°N),应力大小为0.2—0.75×10~8达因·厘米~(-2),整个应力场具有规则的中心对称特征;壳下应力场的几何特征与震源机制解的结果、大震裂缝走向与错动方式、地震的空间分布等均彼此具有良好的一致性,对唐山与海城地震,这种一致性尤为明显。看来,似乎小尺度地幔对流及其造成的壳下应力场对包括目前这次强震高潮在内的华北地区地震的孕震过程起着控制作用。

     
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