大地电磁偏移成像技术的研究进展及其解决复杂地质问题的能力   总被引：1，自引：0，他引：1       下载免费PDF全文

于鹏  王家林  吴健生  陈冰 《地震地质》2001,23(2):238

总结和分析了大地电磁场成像技术的研究现状 ,在Zhdanov等对偏移电磁场的研究和成像技术基础上 ,提出了改进的有限差分法大地电磁场偏移成像技术 ,使差分方程精度和成像分辨率有了明显的提高 ,将前人大地电磁场偏移成像的模型试验研究推进到适用于复杂地电模型和实际资料处理解释的阶段 ,并通过松辽盆地大地电磁测深资料的偏移成像处理和解释展示了该方法的有效性和实用性  相似文献   

澜沧-耿马等强震迁移活动与地电前兆场时空关系     

李晓玲  汪志亮  余素荣 《地震》1996,(3)

研究1988年11月至1990年10月近2a时间内,在22°～36°N,98°～104°E地区连发性的5次6级以上迁移地震与地电前兆的时空关系。结果表明,这组连发性迁移强震发生之前,地电前兆在南北两地区观测到两个应力相对集中区。随着南部系统内应力不断向北调整,发生了多次强震。这组连发性的强震孕育,包括它们各自前兆场分布和发育,彼此并不是孤立的,而是彼此呼应的。  相似文献   

陕西地区地震活动性的初步分析     

许俊奇 《内陆地震》1993,7(3):240-244

依据震中迁移、频度变化曲线、能量释放曲线、震级频度关系和时间序列的预测方法等,对陕西地区的地震活动性进行了初步分析,认为:陕西地区M_L>3.5级的地震活动存在着明显的由北向南、自东向西的迁移特点,其地震活动水平比较正常,今后5年内可能发生M_L≥4.3级地震。  相似文献   

可用于复杂地质体的波动方程基准面技术   总被引：7，自引：7，他引：0  

陈树文  刘洪 《地球物理学进展》2002,17(3):365-369,T001

提出改进的波动方程基准面方法,用于解决地表一致性问题,通过基准面的下移,可以使深部的信号增强,变多值走时为单值走时,从根本上消除了上覆层速度横向不均匀的影响,从而可以更好地解决复杂地质体成像问题。作者从原理上对上述观点给予了证明,而且给出利用波动方程基准面有限差分法做的实例－－大庆油田“陆相断隐模型”。  相似文献   

P-P波及P-SV波叠前深度偏移速度模型建立方法   总被引：11，自引：1，他引：10       下载免费PDF全文

李录明  罗省贤 《地球物理学报》1998,41(Z1):305-318

针对多波叠前深度偏移速度模型的建立问题,提出在CDP道集上利用互换原理组成伪地集作为叠前偏移速度分析的数据道集,先用叠前时间偏移方法求取层间互不影响的等效偏移速度模型,再用餐前深度偏移方法逐层求取层速度模型．对各层的速度质量、整个速度模型层位结构及速度横向变化,采用人机交互方式进行监控,并在速度叠代中引入全局寻优的遗传算法,使整个速度模型建立过程具有稳定、可靠和可视化的优点．经理论和实际资料处理结果证明,本方法是行之有效的．  相似文献   

江苏溧阳软玉与良渚文化庄桥坟遗址出土软玉的特征对比研究     

李晶  高洁  童欣然  皮白灵  杨明星 《地质科学译丛》2010,(3):19-25,33

采用常规宝玉石鉴定方法、偏光显微镜和激光剥蚀电感耦合等离子体质谱仪对江苏省溧阳县小梅岭玉矿的软玉样品进行了测试研究,并与良渚文化庄桥坟遗址出土的软玉类玉器样品进行了对比。结果表明,溧阳软玉样品和庄桥坟遗址出土软玉类玉器样品的主要矿物组成为透闪石,但后者的w（FeOT）明显高于前者的。庄桥坟遗址出土玉器样品的δEu普遍高于溧阳软玉样品的,大部分为负异常,为轻稀土亏损型,微量元素种类多;溧阳软玉样品的δEu为负异常,为轻稀土富集型,微量元素种类少,说明两种样品应不属于同一产地或同一成因性质。良渚文化庄桥坟遗址出土玉器样品的化学成分与溧阳软玉样品的不同,这与当今考古界普遍认为良渚文化玉器来源于溧阳软玉的观点有所不同。  相似文献   

Mud volcanism and fluid geochemistry in the Cheleken peninsula,western Turkmenistan     

《Marine and Petroleum Geology》2014

A geological and geochemical study has been carried out to investigate the relationships between major mud volcano structures and deep fluid migration in the Cheleken peninsula, in the South Caspian Basin. The fluid geochemistry allowed the origin and migration of the saline waters and the hydrocarbons to be deduced along with the regional source and reservoir rocks. The emitted waters formed by the mixing of deep highly saline water from the main source rocks of the Maykop Fm with the Caspian-like pore water contained in the Pliocene reservoirs. The water composition is very similar to that emitted by the mud volcanoes in Azerbaijan, allowing comparisons to be done between the reservoirs in the western and eastern sides of the South Caspian Basin. The associated oil is derived from a mixed type II/III kerogen deposited in a sub-oxic marine environment and generated during the early oil window. The oil biomarkers indicate that the source rock is the Maykop Fm., as previously determined for the other areas of the South Caspian Basin.The spontaneous emissions, showing different morphologies, are mainly aligned along normal and transtensive fault systems, which provide effective pathways for rapid fluid ascent from deep reservoirs to the surface.  相似文献   

Escape to victory: Development,youth entrepreneurship and the migration of Ghanaian footballers     

《Geoforum》2015

This article contributes to contemporary debates over the resourcefulness and entrepreneurialism of young people in the Global South by exploring the relationship between development and the migration of male youth within the football industry. Drawing on fieldwork in Accra, the paper reveals how young Ghanaians attempt to enact development as freedom through spatial mobility. Significantly, this is coupled with an awareness that their desired spatial mobility is difficult to attain, thereby inducing a sense of involuntary immobility. For some male youth, the solution to this predicament is to invest in their sporting bodily capital and become Foucauldian ‘entrepreneurs of self’ in the form of a professional footballer. Meanwhile for others, the solution to prevailing economic pressures is to embrace financial risk by becoming entrepreneurs in the form of football club owners, and attempting to profit from the movement of players. The interests of these two sets of entrepreneurs coalesce around the fact that the mobility of footballers is crucial to generating a return on their respective investments. It is argued that the construction of young Ghanaians as responsible for their future life chances, and the growing dissonance between aspirations and the ability to migrate, is a key reason why youth are trying to migrate through football. Problematically, this can foster conditions favourable for irregular migration.  相似文献   

Weather-related influences on rural-to-urban migration: A spectrum of attribution in Beira,Mozambique     

《Global Environmental Change》2020

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Temporary labour migration and sustainable post-conflict return in Sierra Leone     

Roy Maconachie  Tony Binns  Paul Tengbe  Reynold Johnson 《GeoJournal》2006,67(3):223-240

Economic and social development indicators suggest that the small West African state of Sierra Leone is among the poorest countries in the world. Sierra Leone’s economy and quality of life deteriorated rapidly during a decade of political instability and civil war in the 1990s, when many people fled their homes and abandoned their livelihoods due to the rebel insurgency. This paper examines the post-war reconstruction scenario in Sierra Leone and presents recent evidence from two rural communities in the Eastern Province that were badly affected by the conflict. The paper considers the links between the farming and diamond mining sectors, which, despite severe dislocation during the conflict period, have proved to be remarkably resilient. It is argued that seasonal labour mobility associated with this dual economy has not only continued to be a key ingredient in sustaining livelihood portfolios, but is actually an essential pre-condition for the creation of an enabling environment for sustainable post-conflict return.

Tony BinnsEmail:

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