全文获取类型
收费全文 | 602篇 |
免费 | 138篇 |
国内免费 | 30篇 |
专业分类
测绘学 | 1篇 |
大气科学 | 111篇 |
地球物理 | 588篇 |
地质学 | 43篇 |
海洋学 | 11篇 |
天文学 | 5篇 |
综合类 | 3篇 |
自然地理 | 8篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 4篇 |
2020年 | 20篇 |
2019年 | 18篇 |
2018年 | 15篇 |
2017年 | 13篇 |
2016年 | 8篇 |
2015年 | 16篇 |
2014年 | 28篇 |
2013年 | 25篇 |
2012年 | 26篇 |
2011年 | 40篇 |
2010年 | 24篇 |
2009年 | 41篇 |
2008年 | 37篇 |
2007年 | 37篇 |
2006年 | 28篇 |
2005年 | 29篇 |
2004年 | 34篇 |
2003年 | 33篇 |
2002年 | 34篇 |
2001年 | 28篇 |
2000年 | 24篇 |
1999年 | 21篇 |
1998年 | 21篇 |
1997年 | 27篇 |
1996年 | 30篇 |
1995年 | 35篇 |
1994年 | 20篇 |
1993年 | 8篇 |
1992年 | 10篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1985年 | 2篇 |
排序方式: 共有770条查询结果,搜索用时 78 毫秒
41.
On the basis of our predecessors' research,we study the distribution and the space-time evolution characteristics of the seismic apparent strain field in Yunnan since the 1970's using the seismic data of Yunnan and its surrounding areas.The result shows that there is a rather strong corresponding relationship between the anomaly region of seismic apparent strain and strong earthquakes.In the nine earthquakes studied,anomaly areas of seismic apparent strain had appeared before eight earthquakes,including five occurring in the anomaly region and three on the edge.Finally,the investigative result is demonstrated primarily. 相似文献
42.
John Douglas 《Bulletin of Earthquake Engineering》2007,5(3):363-376
Accurate estimates of the ground motions that occurred during damaging earthquakes are a vital part of many aspects of earthquake
engineering, such as the study of the size and cause of the uncertainties within earthquake risk assessments. This article
compares a number of methods to estimate the ground shaking that occurred on Guadeloupe (French Antilles) during the 21st
November 2004 (M
w
6.3) Les Saintes earthquake, with the aim of providing more accurate shaking estimates for the investigation of the sources
of uncertainties within loss evaluations, based on damage data from this event. The various techniques make differing use
of the available ground-motion recordings of this earthquake and by consequence the estimates obtained by the different approaches
are associated with differing uncertainties. Ground motions on the French Antilles are affected by strong local site effects,
which have been extensively investigated in previous studies. In this article, use is made of these studies in order to improve
the shaking estimates. It is shown that the simple methods neglecting the spatial correlation of earthquake shaking lead to
uncertainties similar to those predicted by empirical ground-motion models and that these are uniform across the whole of
Guadeloupe. In contrast, methods (such as the ShakeMap approach) that take account of the spatial correlation in motions demonstrate
that shaking within roughly 10 km of a recording station (covering a significant portion of the investigated area) can be
defined with reasonable accuracy but that motions at more distant points are not well constrained. 相似文献
43.
44.
45.
Since the late 1970s, the dynamic range and resolution of strong motion digital recorders have leaped from 65 to 135 dB, opening new possibilities for advanced data processing and interpretation. One of these new possibilities is the calculation of permanent displacement of the ground or of structures, associated with faulting or with non-linear response. Proposals on how permanent displacements could be recovered from recorded strong motion have been published since 1976. The analysis in this paper concludes that permanent displacements of the ground and of structures in the near-field can be calculated provided all six components of strong motion (three translations and three rotations) have been recorded, and the records are corrected for transducer rotation, misalignment and cross-axis sensitivity. 相似文献
46.
Evolution of accelerographs, data processing, strong motion arrays and amplitude and spatial resolution in recording strong earthquake motion 总被引:1,自引:0,他引:1
This paper presents a review of the advances in strong motion recording since the early 1930s, based mostly on the experiences in the United States. A particular emphasis is placed on the amplitude and spatial resolution of recording, which both must be ‘adequate’ to capture the nature of strong earthquake ground motion and response of structures. The first strong motion accelerographs had optical recording system, dynamic range of about 50 dB and useful life longer than 30 years. Digital strong motion accelerographs started to become available in the late 1970s. Their dynamic range has been increasing progressively, and at present is about 135 dB. Most models have had useful life shorter than 5–10 years. One benefit from a high dynamic range is early trigger and anticipated ability to compute permanent displacements. Another benefit is higher sensitivity and hence a possibility to record smaller amplitude motions (aftershocks, smaller local earthquakes and distant large earthquakes), which would augment significantly the strong motion databases. The present trend of upgrading existing and adding new stations with high dynamic range accelerographs has lead to deployment of relatively small number of new stations (the new high dynamic range digital instruments are 2–3 times more expensive than the old analog instruments or new digital instruments with dynamic range of 60 dB or less). Consequently, the spatial resolution of recording, both of ground motion and structural response, has increased only slowly during the past 20 years, by at most a factor of two. A major (and necessary) future increase in the spatial resolution of recording will require orders of magnitude larger funding, for purchase of new instruments, their maintenance, and for data retrieval, processing, management and dissemination. This will become possible only with an order of magnitude cheaper and ‘maintenance-free’ strong motion accelerographs. In view of the rapid growth of computer technology this does not seem to be (and should not be) out of our reach. 相似文献
47.
48.
以东经108°线为界,把中国大陆分为东、西两部,东部取震级M≥6的地震、西部取M≥7的地震为强地震.利用有史以来全部地震资料,针对不同情况和不同时期,系统地研究了相继两次强地震之间的时间间隔,目的在于讨论一次强地震发生之后,下一次强地震何时发生.在所有情况下地震间隔数目都随时间间隔值的增大呈明显的趋势性减小.给出了8种情况下的间隔数目统计和相应的模拟函数,以及间隔值的经验概率和相应的函数模拟概率.由此可估计时间间隔为某个值的概率,也可估计时间间隔处于某个区间的概率.反之,对于给定的概率,可估计时间间隔的值或它所处的区间. 相似文献
49.
50.
自然数可以视为反映世界客观本质的一种重要秩序,即信息,它不因加法处理而失真[1]。强地震在一定的时空范围内重复出现的现象称为有序性。自1716年以来,新疆及其邻区7级以上强震在时间上具有良好的有序性,有些强震在空间上亦表现出一定的有序性。强地震时间间隔值以60、30、41、19和11年占据主导分布,并且相互之间关系密切。根据强震活动的有序性结构可进行预测:该地区未来M≥7强震可能发生在2004年和2015年前后。 相似文献