日本九州岛地震震前电离层TEC异常     

杨力  赵海山  董明  徐世依  南天浩 《测绘学报》2016,45(Z2):139-146

采用IGS发布的GIM数据,提出了一种结合滑动时窗法和临近格网点电离层TEC相关性分析法的联合分析方法,研究了震前电离层异常变化与地震的关系。通过分析震区附近5个格网点TEC的异常变化情况,发现震前电离层TEC发生明显异常变化,且格网点之间的TEC序列相关性受地震显著影响;通过分析二维电离层图的TEC异常空间分布,发现震前三天震中附近分别出现6h、12h和6h的异常。最后利用电离层层析的方法,对电离层异常时刻进行了电子密度的反演,进一步分析了电子密度在电离层异常时刻的分布情况。  相似文献   

Deep petroleum occurrences in the Lower Kura Depression, South Caspian Basin, Azerbaijan: an organic geochemical and basin modeling study   总被引：1，自引：0，他引：1  

Sedat Inan  M. Namik Yalin  Ibrahim S. Guliev  Kerem Kuliev  A. Akper Feizullayev 《Marine and Petroleum Geology》1997,14(7-8)

High sedimentation rates (as much as 2500 m/Ma) during Pliocene-Pleistocene, with a resultant undercompacted section as thick as 10,000 m, and lower than normal geothermal gradients are the main characteristics which have created all the means for generation and preservation of oil at deep layers in the Lower Kura Depression.Oils collected from eight different oil fields for analyses seem to have originated from a common source rock which probably is clastic, deposited in relatively subanoxic to suboxic transitional marine environment receiving low to moderate input of terrestrial organic matter.Oils from shallow (< 3000 m) and cold (< 70–80°C) reservoirs have been altered to various extent by bacterial activity.A computer-aided basin modeling study has been carried out to outline the spatial variation of the oil window and thus help in further identification of possible source rocks for the reservoired oil in the Lower Kura Depression. Results suggest that the potential hydrocarbon source horizons of the Miocene and Pliocene Red Bed Series of the so called Productive Succession are, even at depocenter areas, immature with respect to oil generation, and thus, are very unlikely to have been source rocks for the reservoired oils. However, the Oligocene-Lower Miocene Maykop rocks are marginally mature to mature depending on locality and the Eocene and older rocks are mature with respect to oil generation at all representative field locations. Oil generation commenced at the end of Pliocene and continues at present at depths between 6000 and 12,000 m.An unusually deep (> 10,000 m) oil window in the depocenter areas has been caused by the depressed isotherms due to extremely high sedimentation rates (up to 3000 m/Ma) for the last two million years. The main phase of oil generation is taking place at depths greater than what most of the wells in the study are have reached.  相似文献   

定量与定性分析在2017年精河M_S6.6地震中的应用     

张占阳  孙启凯  何亚东  张俊青  刘坤 《华北地震科学》2021,(1):64-69

为准确提取震前异常信息,以2017年新疆精河M_S6.6地震为例,基于乌鲁木齐台站W-N(k)测段数据,利用离差统计分析方法与原始曲线分析方法分别从定量与定性两个角度研究了地震前后的数据异常特征。结果显示,震前测段数据的变差系数成倍增大,离差分布曲线偏离正态分布,原始曲线出现大幅转折,断层活动形式出现明显变化,震后异常特征消失。通过效果图可知,结合两种方法分析数据异常具有一定的可行性,能为震前异常识别提供参考。  相似文献   

甘肃“古浪地震窗”双差波速比特征     

王丽霞  张辉  张博  徐溶 《地震地磁观测与研究》2021,42(2):180-181

  相似文献   

一种改进的SAR图像聚焦算法     

倪崇  王岩飞  徐向辉  周长义  崔鹏飞 《测绘学报》2012,41(3):449-453

针对现有的相位梯度自聚焦(phase gradient autofocus,PGA)算法的加窗方法和特显点选取所存在的问题,提出一种改进的PGA算法。该算法提出一种新的确定相位误差点扩展函数支撑域的方法,此方法计算方位向上能量分布的平均值作为支撑域外的平均能量,以此来确定加窗的宽度。基于这种自适应加窗方法,还提出一种改进的特显点选取方法,该方法能够选择信杂比大的特显点,去掉信杂比小的特显点。试验结果表明,与传统的加窗方法和特显点选取方法相比,该方法能够得到更好的聚焦效果。  相似文献   

基于Access的钻孔资料查询界面设计     

何雨明  杨牧 《城市地质》2010,5(4):33-35

矿山数据资料多,在勘查阶段设计后续钻孔工程时经常要查阅之前的钻孔资料。本文是在整理马来西亚吉兰丹州Ulusokor金矿区钻孔资料过程中用Access设计的一个简单查询界面,充分利用了Access用户友好的操作界面及其查询修改记录的强大功能,使得查询起来不再麻烦,既有利于资料整理,又有利于后续工程的布置。  相似文献   

清江流域水库滑坡数据库系统开发   总被引：2，自引：0，他引：2  

王世梅  杨耀 《水文地质工程地质》2001,28(3):58-59,75

介绍了清江流域水库滑坡数据库系统的数据结构、功能及窗口界面等特点。本系统利用VFP的可视化和面向对象的编程技术，实现了数据库系统强大的数据查询、数据维护、报表打印及系统维护管理功能，并具有与WINDOWS系统完全一致的窗口界面。  相似文献   

用陆地卫星TM6数据演算地表温度的单窗算法   总被引：263，自引：3，他引：263  

覃志豪 《地理学报》2001,56(4):456-466

陆地卫星 TM数据 (TM6)热波段表示地表热辐射和地表温度变化。长期以来 ,从 TM6数据中演算地表温度通常是通过所谓大气校正法。这一方法需要估计大气热辐射和大气对地表热辐射传导的影响 ,计算过程很复杂 ,误差也较大 ,在实际中应用不多。根据地表热辐射传导方程 ,推导出一个简单易行并且精度较高的演算方法 ,把大气和地表的影响直接包括在演算公式中。该算法需要用地表辐射率、大气透射率和大气平均温度 3个参数进行地表温度的演算。验证表明 ,该方法的地表温度演算较高。当参数估计没有误差时 ,该方法的地表温度演算精度达到 <0 .4℃ ,在参数估计有适度误差时 ,演算精度仍达 <1 .1℃。因该方法适用于仅有一个热波段的遥感数据 ,故称为单窗算法。  相似文献   

    

Luan-Sheng Su 《地震学报(英文版)》1995,8(1):51-56

Based on the observations of many years, it has been found that “small earthquake modulation windows” exist in the situation of some special geological structures, which respond sensitively to the variations of regional stress fields and the activities of earthquake swarms greater than moderate strong magnitude, and can supply some precursory information. More than two “small earthquake modulation windows” can also provide a general orientation of the first main earthquake of a earthquake cluster. Compared with “seismic window” based on frequency it is no doubt that the “modulation-window” has an unique characteristic of applicational significance to medium-term earthquake prediction with a time scale of two or three years. The English version is improved by Prof. Xin-Ling QIN, Institute of Geophysics, SSB, China.  相似文献   

邢台震情窗口的遥联性   总被引：2，自引：0，他引：2  

王泽皋  高景春 《山西地震》1995,(2):14-18

通过邢台震情窗口的成组震兆与中国大陆及边邻大地震整体链式活动的对应关系，指出该“窗”具有遥联性的特点，它可能为我国大陆及边邻活动大形势作中期遥联预报或其它有关的研究工作提供有益的参考。文末对这种遥联现象的物理成因进行了初步讨论。  相似文献