非洲裂谷的深入研究     

Morgan  P 耿杰 《地震地质译丛》1993,15(4):59-60

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深井水位气压效率和相关系数在中强地震前的变化特征   总被引：3，自引：0，他引：3       下载免费PDF全文

耿杰  周斌  张昭栋 《地震工程学报》2002,24(3):257-261

采用高阶差分求深井水位的气压效率和相关系数的方法并优选最佳相关结果，获得了5口井在两次中强地震前二的变化，认为从这一方法中提了的短临异常信息是可行的，可以作为中强地震前的短临异常指标。  相似文献   

山东聊古一井水化学组分地震异常的场源兆特征及其机制讨论          下载免费PDF全文

耿杰  张昭栋 《地震工程学报》1997,19(4):58-65

从山东聊古一井构造地质和水文地质条件的分析入手，以实际观测的水化学组分地震前兆异常变化实例为基础，讨论了该井水化学组分震前异常变化的场源兆特征．利用断层位错理论和岩石力学实验获得的认识探讨了聊古一井水化学组分变化场源兆异常形成的物理力学机制及预报意义．所获成果丰富了对场源兆地震前兆的认识，同时对地震预测预报也有一定的意义．  相似文献   

1668年郯城8.5级地震震源参数及其讨论   总被引：1，自引：0，他引：1  

王华林  耿杰 《地震学刊》1996,(4):27-33

利用野外考察资料系统地计算和屯１６６８年郯城地震的震源参数，讨论了其特点进而提出了计算地震断层动摩擦阻力和应力的公式，给出了衡量地震断层破裂彻底度的判别指标和主震后强余震的预测方法。  相似文献   

聊古─井水溶气体的震前异常特征   总被引：1，自引：0，他引：1  

耿杰 《地震研究》1996,(4)

本文对聊古一井水溶气体在１９８３年菏泽５．９级地震、１９９１年大同５．８级地震和１９９２年南黄海５．３级地震前的异常特征进行了分析总结，并结合地震场、源兆进行了初步探讨。认为聊古一井水溶气体的某些组分（如汞、氦气、二氧化碳、气体总量）具有良好的映震能力；氮氦比有利于突出地震异常信息，是提取震前短临异常简单可行的方法；聊古一井水溶气体的震前异常信息具有场兆和源兆的双重特征，来自源的地震异常信息具有良好的同步性，来自场的地震异常信息具有复杂性。  相似文献   

根据板块构造理论分析尼泊尔的喜马拉雅山区至西藏...     

Verma  RK 张崇立 《国外地质(北京)》1990,(2):5-14

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Carbon isotopic fractionation associated with lipid biosynthesis by a cyanobacterium: relevance for interpretation of biomarker records   总被引：9，自引：0，他引：9  

Sakata S  Hayes JM  McTaggart AR  Evans RA  Leckrone KJ  Togasaki RK 《Geochimica et cosmochimica acta》1997,61(24):5379-5389

For the cyanobacterium Synechocystis UTEX 2470, grown photoautotrophically to a logarithmic stage of growth, the total lipid extract is depleted in 13C by 4.8% relative to average biomass. Depletions observed for acetogenic (straight-chain) lipids range from 7.6 (hexadecanoic acid) to 9.9% (a C16 n-alkyl chain bound in a polar-lipid fraction), with a mass-weighted average of 9.1%. Polyisoprenoid lipids fall into two isotopic groups, with phytol, diplopterol, and diploptene depleted by 6.4-6.9% and bishomohopanol (produced from the extracts by the preparative degradation of bacteriohopanepolyol) depleted by 8.4%. Analysis of the pattern of depletions indicates that two carbon positions in each C5 biomonomer leading to polyisoprenoid products are probably depleted in 13C relative to average biomass. The depletion of bacteriohopanepolyol relative to other polyisoprenoids can be ascribed to changes that occur over the life of each cell: (1) the 13C content of carbon flowing to lipid biosynthesis decreases as the cell size increases and (2) a greater proportion of the bacteriohopanepolyol which, unlike other polyisoprenoids, is present mainly in the cytoplasm rather than in membranes and is synthesized when cells are larger. Chlorophyll a is depleted relative to average biomass by O.7%. Given the observed depletion of 13C in phytol, the heteroaromatic, chlorophyllide portion of chlorophyll must be enriched in 13C by 2.7%. This enrichment is large relative to that in chlorophyllides produced by eukaryotes and may be related to a parallel enrichment of 13C in cyanobacterial glutamic acid. As in many previous investigations of cyanobacterial lipids, long-chain n-alkanes (C22-C29) are found in the extracts. They are, however, enriched in 13C relative to biomass and have isotopic compositions suggesting that they are contaminants of petrochemical origin. Available results indicate that cyanobacterial lipids will be depleted relative to dissolved CO2 that has served as a carbon source by 22-30% and that a wider range of depletions will be characteristic of eukaryotic products. The absence of long-chain n-alkanes in cyanobacteria reduces the possibility that petroleum ever formed from pre-eukaryotic sedimentary debris.  相似文献   

Preliminary study on characteristics of earthquake precursor of earth resistivity anisotropy degree in East China     

冯志生  杨建军  梅卫萍  耿杰  汪雪泉  刘义高 《地震学报(英文版)》2004,17(2):244-250

Introduction The degree of earth-resistivity anisotropy was described (MAO, et al, 1995, 1998) as follows: S=|1\nn∑I=1(ρSN\ρEW)I|-1|×103 n=6(1) whereρNS and ρEW are monthly mean values of earth resistivity in the direction of NS and EW, respectively, S is the half-year value. Equation (1) shows that if ρNS=ρEW, then S =0 and the electrical property of medium is isotropic; if ρNS≠ρEW, then S≠0 and the electrical property of medium is anisotropic. When S increases, the anisotropy of electrical property of medium is enhanced. Because the rightside of equation (1) is absolute value and the possibility ofρNS＞ρEW and ρNS＜ρEW can be different at different stations, the increase or decrease of S cannot reflect the relative changes between ρNS and ρEW. FENG, et al (2000) defined S as follows:  相似文献   

山东和邻区盆地构造及其与地震的关系     

耿杰 《山东地质》1993,9(2):52-60

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井水位降雨影响的定量改正   总被引：3，自引：0，他引：3       下载免费PDF全文

张昭栋  耿杰  高玉斌  张铸钢 《地震学报》1993,(2)

给出了井水位降雨影响定量改正的新方法.利用褶积滤波和多元回归的方法,考虑到降雨对井水位影响的滞后“记忆”效应,对井水位进行降雨影响改正.对鲁08井水位的降雨改正结果表明,该方法的改正效果是比较好的.  相似文献