全文获取类型
收费全文 | 5522篇 |
免费 | 856篇 |
国内免费 | 1502篇 |
专业分类
测绘学 | 1062篇 |
大气科学 | 22篇 |
地球物理 | 1701篇 |
地质学 | 3755篇 |
海洋学 | 174篇 |
天文学 | 18篇 |
综合类 | 799篇 |
自然地理 | 349篇 |
出版年
2024年 | 33篇 |
2023年 | 101篇 |
2022年 | 165篇 |
2021年 | 202篇 |
2020年 | 231篇 |
2019年 | 272篇 |
2018年 | 220篇 |
2017年 | 263篇 |
2016年 | 285篇 |
2015年 | 301篇 |
2014年 | 335篇 |
2013年 | 324篇 |
2012年 | 338篇 |
2011年 | 380篇 |
2010年 | 287篇 |
2009年 | 397篇 |
2008年 | 359篇 |
2007年 | 361篇 |
2006年 | 348篇 |
2005年 | 285篇 |
2004年 | 309篇 |
2003年 | 288篇 |
2002年 | 241篇 |
2001年 | 186篇 |
2000年 | 188篇 |
1999年 | 169篇 |
1998年 | 146篇 |
1997年 | 158篇 |
1996年 | 141篇 |
1995年 | 111篇 |
1994年 | 107篇 |
1993年 | 89篇 |
1992年 | 71篇 |
1991年 | 42篇 |
1990年 | 40篇 |
1989年 | 29篇 |
1988年 | 28篇 |
1987年 | 18篇 |
1986年 | 12篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1979年 | 3篇 |
1975年 | 1篇 |
1954年 | 3篇 |
排序方式: 共有7880条查询结果,搜索用时 0 毫秒
291.
Dhruba Mukhopadhyay Tapas Bhattacharya Tapan Chakraborty Arun Kanti Dey 《Journal of Earth System Science》1990,99(2):249-268
In the western part of the North Singhbhum fold belt near Lotapahar and Sonua the remobilized basement block of Chakradharpur
Gneiss is overlain by a metasedimentary assemblage consisting of quartz arenite, conglomerate, slate-phyllite, greywacke with
volcanogenic material, volcaniclastic rocks and chert. The rock assemblage suggests an association of volcanism, turbidite
deposition and debris flow in the basin. The grade of metamorphism is very low, the common metamorphic minerals being muscovite,
chlorite, biotite and stilpnomelane. Three phases of deformation have affected the rocks. The principal D1 structure is a
penetrative planar fabric, parallel to or at low angle to bedding. No D1 major fold is observed and the regional importance
of this deformation is uncertain. The D2 deformation has given rise to a number of northerly plunging major folds on E-W axial
planes. These have nearly reclined geometry and theL
2lineation is mostly downdip on theS
2surface, though some variation in pitch is observed. The morphology of D2 planar fabric varies from slaty cleavage/schistosity
to crenulation cleavage and solution cleavage. D3 deformation is weak and has given rise to puckers and broad warps on schistosity
and bedding. The D2 major folds south of Lotapahar are second order folds in the core of the Ongarbira syncline whose easterly
closure is exposed east of the mapped area. Photogeological study suggests that the easterly and westerly closing folds together
form a large synclinal sheath fold. There is a continuity of structures from north to south and no mylonite belt is present,
though there is attenuation and disruption along the fold limbs. Therefore, the Singhbhum shear zone cannot be extended westwards
in the present area. There is no evidence that in this area a discontinuity surface separates two orogenic belts of Archaean
and Proterozoic age. 相似文献
292.
THE QIONGHAI CRUSTAL TILT OBSERVATION SYSTEM AND THE SEISMIC ACTIVITY IN WESTERN SICHUAN PROVINCE, CHINA 下载免费PDF全文
In this paper, we introduce the measurements of crustal tilt using the Qionghai Observation System and a preliminary approach to the relation between the crustal plane tilt observed by the System and seismic activity in the region around the Qionghai Lake, at Xichang.The results show that the observed accuracy may reach the magnitude of 10-7-10-8 radian. The processes of the crustal stress accumulation and release are characterized by the activity of moderate earthquakes (M≥5.0) whose 相似文献
293.
本文在研究和分析环境因子对断层测量年周变和季节性变化影响的基础上,归纳出断层形变测量年周变的变化规律,并针对不等周期观测资料,建立了形变测量的准线性动态数学模型,最后,对门源地震有异常的扁都口资料用上述模型进行了处理,结果是比较满意的。 相似文献
294.
Closed form analytic expressions for displacement and stresses at any point of either of the two homogeneous, isotropic, perfectly
elastic half-spaces in welded contact due to very long strike-slip dislocations are obtained. Both cases of vertical and horizontal
strike-slip dislocations are discussed in detail. Variation of the displacement with horizontal distance from the fault and
with vertical distance from the interface for a vertical strike-slip fault is studied numerically. 相似文献
295.
ResearchofpatterndynamicsparametersofcrustaldeformationfieldinseismogenicprocessShuo-YuZHOU(周硕愚),YunWU(吴云),Ruo-BoWANG(王若柏)and... 相似文献
296.
Investigationontherelationbetweenthegravityanomaly,crustaldeformationandundergroundwaterXue-FangWU(吴雪芳),Shi-HuaTIAN(田世华)andGu... 相似文献
297.
依据大地测量资料,分析研究了南口-孙河断层的活动性及其对区域构造活动的控制作用。研究认为,南口-孙河断层现今仍有活动,东三旗以西为张性反扭。该断层对首都圈构造活动具有控制作用,为一主干断层,近期活动增强。在首都圈构造活动性研究及地震趋势预测中,对南口-孙河断层必须予以足够的重视。 相似文献
298.
根据山西多年的倾斜形变观测资料,综合研究了大同-阳高6.1级地震前的中长期孕育过程、中短期前兆异常特征、震前微破裂所显示的固体潮畸变临震异常,以及震前山西地震带形变应力场状况。采用“实用化攻关”方法识别异常进行分析得出,震前山西大部分倾斜形变台站存在一定的异常变化的结论。 相似文献
299.
In this paper,the equivalent force inside the source which produces a large area deformation field is calculated by using the records of residual deformation,S wave radiation of shear dislocation source and Green function of the Lancang-Gengma earthquake.Under the action of equivalent force whose intensity was 1.103×1013 N,the crust derm of northeast segment of seismic fault had finished the upraise and formed permanent irrecoverable deformation within 20.46 min after the major earthquake occurred.The authors indicate that the residual deformation would split into 2 deformation fields with different propagation velocities and different directions in the Song-distance propagation process. 相似文献
300.
本文利用青海地区近几十年的大地测量资料,探讨了该区现今地壳垂直形变与现代构造运动及强震活动之间的关系,认为青藏高原北部目前仍处于强烈的构造运动活跃期,判定了两处有可能是未来发生强震的场所,并对青藏高原北部强震成因提出了作者的看法。 相似文献