显微构造与组构在铀矿地质研究中的应用

该文拟就作者研究花岗岩型、火山岩型、碳硅泥岩型和砂岩型矿床的含矿构造岩和含矿岩石所获得的显微构造资料,对显微构造的应用、做法与存在问题作进一步探讨。     

On intermediate-term prediction of strong earthquakes in the Himalayan arc region using pattern recognition algorithm M8

Seismicity of the Himalayan arc lying within the limits shown in figure 1 and covering the period 1964 to 1987 was scanned using M8 algorithm with a view to identifying the times of increased probabilities (TIPs) of the occurrence of earthquakes of magnitude greater than or equal to 7·0, during the period 1970 to 1987. In this period, TIPs occupy 18% of the space time considered. One of these precedes the only earthquake in this magnitude range which occurred during the period. Two numerical parameters used in the algorithm, namely the magnitude thresholds, had to be altered for the present study owing to incomplete data. Further monitoring of TIPs is however warranted, both for testing the predictive capability of this algorithm in the Himalayan region and for creating a base for the search of short-term precursors.     

怀来、延庆地区的水平形变

本文利用1966年和1986年的两期三角(边)测量资料,研究了怀来、延庆地区水平形变场的主要特征     

三轴压缩下两类砂岩变形破坏的实验研究

本文讨论了围压高达700MPa的条件下,发生实验变形的长石砂岩和石英砂岩的变形模式和变形机制。完整长石砂岩的脆延过渡带在200—400MPa,完整石英砂岩的脆延过渡带在250—350MPa,长石砂岩在600MPa围压以上出现高压脆化现象;两类切口岩石的稳滑粘滑过渡界限分别是200MPa和150MPa。不同的变形模式主要起因于程度不同的碎裂机制。文中还对矿物成分的影响、脆性行为之延伸等有关问题进行了简要讨论     

张北6.2级地震地温短临异常特征

张北地震前４０天左右,在距该震中１００－２００ｋｍ的河北阳原三马坊、北京塔院和延庆五里营地温测点先后出现典型地温短临异常,异常幅度为０．００１－０．０１℃,据此作了一定程度的预报姑震级和震中距相近的条件下,三马坊测点在张北地震前的地温异常变化幅度仅为大同阳高地震前的１／１０,这可能与构造条件有关。在该地震的映震范围内有关兆反应的地温测点所占比比例为２７％。     

张北6.2级地震测震学指标短临判定分析

在对地震学前兆认识的基础上,总结了张北６．２级地震前作出短临判定的可能依据,分析考虑了由场及源、由中国向短临过渡的认识思路。在短临三要素判定中强 空区、条带、平静、震群和中等地震活动及测震学指标异常在时间上的相依性和物理上的关联性。并且对华北近几年发生的５次６级地震的测震学前兆作比较,表明无论是地震活动性或指标参数寂均有共性,但程度各有不同。还非线性理论中的尺度依赖性原理提出一各一范围中的强震进行     

通辽CK9井水位的河水荷载效应

１９９１年６￣８月,通过ＣＫ９井记录到一次河水荷载引起井水位变化过程。以深井水位、河水位资料为基础,对这一现象进行分析讨论。     

Deformation patterns in a high-viscosity lava flow inferred from the crystal preferred orientation and imbrication structures: an example from Salina (Aeolian Islands,southern Tyrrhenian Sea,Italy)

Shape-preferred orientation and imbrication structures of crystals have been measured on samples representative of the base, centre and top of a highly viscous lava flow on Salina (Aeolian Islands, southern Tyrrhenian Sea). The data allow zones with different deformation patterns to be identified. In the base and top of the flow, deformation leads to the development of discrete preferred orientation and imbrication of the elongate crystals. The sense of shear is right-lateral at the base and left-lateral at the top of the flow. Shear strain can be estimated by the analysis of crystal preferred orientation. Deformation increases from the flow centre to the outer, more viscous boundary layers. Random orientation of crystals in the inner zone supports the presence of plug flow in a pseudoplastic lava. The textural features of the studied lava may be related to different mechanisms (i.e. lateral expansion). We conclude that the observed crystal alignments and imbrication structures may be related to a plug flow moving between two non-deforming walls. The walls are represented by the solidified, broken upper and basal crust of the flow. The low shear strain values calculated in the outer margins of the flow are indicative of the last deformation event. Crystal preferred orientation and imbrication structures may be related to the occurrence of velocity gradients existing between the inner zone of the flow and its solidus or near-solidus outer margins.     

乌鲁木齐形变台地道2号点的抬升与地震的关系

通过对乌鲁木齐形变台地道２号点自１９８１至１９９３年中抬升变化的分析，发现乌鲁木齐地区５级以上地震及新疆境内６级以上地震发生前，２号点出现抬升变化，这可能与印度板块特别是帕米尔弧形顶端向北的推挤力的变化有关。     

以双可区分度为准则的变形监测网非线性动态优化设计

在监测网设计阶段，不仅要考虑不同变形模型之间的可区分度，而且要研究变形与粗差的可区分度，即双可区分度，以利以后进行变形分析。文中导出了变形与粗差的可区分度，并以双可区分度为准则进行监测网非线性动态优化设计。同时给出了一个非线性直接优化算法，该算法避开了常规的台劳级数线性展开的方法，易于在计算机上实现。