兴1井水位的映震特征     

张文阁  迟恭财等 《地震》1995,(2):157-160

兴1井是辽宁省内最早建成的静水位观测井，已有近20年的观测历史。系统分析预测以来的资料，发现该井水位有很强的映震能力并有一定的映震规律，可进行单井水位异常预报地震震级与发震时间的科学试验。  相似文献   

海城7．3级地震前地震波动力学特征量的异常变化   总被引：1，自引：0，他引：1  

冯德益  顾瑾平  陈化然  郭瑞芝  杨彩霞 《东北地震研究》1995,(4)

本文给出对海城７．３级地震前地震波动力学特征量变化的一些最新研究结果。所研究的地震波包括体波（Ｐ，Ｓ波）、尾波和短周期地脉动三类。特征量有：体波与地脉动的波形时间线性度和空间线性度，平均半周期，频谱的峰值频率、拐角频率、相对频带宽度、相对频谱峰值、高频段的谱线斜率绝对值；尾波的时间熵、振幅比、持续时间、观测与计算持续时间差及其二阶差分、Ｑ＿ｃ值、反映介质混浊度与震源特性的系数ａ＿ｃ等。所得结果表明，三类地震波的上述动力学特征量大都在震前一至半年左右出现、有的在６－１０天乃至一天以内出现过不同形态的阶段性异常变化，因而可看作海城地震的中短期和临震的地震波前兆异常指标。  相似文献   

Surface conductivity in rocks: a review     

C. Ruffet  M. Darot  Y. Guéguen 《Surveys in Geophysics》1995,16(1):83-105

Electrical properties of rocks depend on composition (i.e. bulk properties of the constituents), micro structure (i.e. geometrical arrangement of the constituents) and interfacial effects. We consider here a rock as a three component system — grains, pores, and interfaces — in order to account for the observed behaviour. We review first the main results relative to DC. conductivity. Surface conductivity effects show up clearly in the case of shaly formations or at low salinities. Although Archies' law (1942) and Waxman and Smits model (1968) are widely used, a more physically based model is that of Johnson and Sen (1988). We review also the variable frequency conductivity (complex conductivity) data and models. The important effect in that case is the enhancement of the dielectric constant at low frequencies (Knight and Nur, 1987) which can be interpreted as a geometrical effect although electrochemical interactions may also play an important role at low frequencies, depending on the rock type.  相似文献   

中国大气向下辐射的气候学研究   总被引：2，自引：0，他引：2  

翁笃鸣  孙治安 《南京气象学院学报》1993,16(1):1-6

  相似文献   

TVGA图形适配器对多卜勒风速的显示   总被引：2，自引：0，他引：2  

顾松山  姜海燕 《南京气象学院学报》1993,16(4):446-450

着重介绍单多卜勒雷达圆锥体扫描获得的风速，回波强度资料在显示之前的数据处理方法，以及用ＴＶＧＡ图形适配器的高分辨显示模式（８００×６００，２５６色）显示多卜勒风场的技术。  相似文献   

用非色散红外气体分析仪进行大气CO2本底浓度的测量   总被引：7，自引：1，他引：7  

温玉璞  季秉法 《应用气象学报》1993,4(4):476-480

按WMO关于开展全球CO2监测的要求，在对引进设备进行改进的情况下，建立了我国开展大气CO2本底浓度连续测量的红外气体分析测量系统及有关方法。系统的测量精度优于0.1ppm，完全满足全球本底测量的要求，并具有较好的国际可比性。在此基础上，首次取得了我国大陆上空大气CO2的本底浓度资料。  相似文献   

Rupture segmentation and assessment of probabilities of seismic potential on the Xiaojiang fault zone     

Xue-Ze Wen 《地震学报(英文版)》1993,6(4):993-1004

Spatial distribution of sources of strong and large earthquakes on the Xiaojiang fault zone in eastern Yunnan is studied according to historical earthquake data. 7 segments of relatively independent sources or basic units of rupture along the fault zone have been identified preliminarily. On every segment, time intervals between main historical earthquakes are generally characterized by “time-predictable” recurrence behavior with indetermination. A statistic model for the time intervals between earthquakes of the fault zone has been preliminarily established. And a mathematical method has been introduced into this paper to reckon average recurrence interval between earthquakes under the condition of having known the size of the last event at a specific segment. Based on these, ranges of the average recurrence intervals given confidence have been estimated for events of various sizes on the fault zone. Further, the author puts forward a real-time probabilistic model that is suitable to analyze seismic potential for individual segments along a fault zone on which earthquake recurrence intervals have been characterized by quasi-time-predictable behavior, and applies this model to calculate conditional probabilities and probability gains of earthquake recurring on the individual segments of the Xiaojiang fault zone during the period from 1991 to 2005. As a consequence, it has shown that two parts of this fault zone, from south of Dongchuan to Songming and from Chengjiang to Huaning, have relatively high likelihoods for strong or large earthquake recurring in the future. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 322–330, 1993.  相似文献   

CT导引下活检与介入性治疗(附646例)     

张雪哲  古晓泉  王廷昱  卢延 《CT理论与应用研究》1993,(3)

本文报告646例经皮细针穿刺活检和介入性治疗。穿刺活检459例,介入性治疗187例。穿刺活检部位:腹部175例,其中肝脏81例,胰腺56例,腹腔包块7例,肾脏22例,肾上腺5例,脾脏3例,前列腺1例;胸212例;骨骼肌肉系统52例;颅脑20例。介入性治疗:硬化剂治疗156例,其中肾囊肿硬化剂治疗142例,肝囊肿硬化剂治疗14例;抽吸和/或引流25例,其中脑出血血肿抽吸占19例;CT 导引下电针治疗5例;交感神经阴断术1例。各部位穿刺活检正确率是有差异的,肝脏为94%,肾脏95%,胰腺和腹腔包块89%,胸部91%,骨骼肌肉系统90%,颅脑90%。介入性治疗闻效肾囊肿硬化剂治疗为96%,肝囊肿硬化剂治疗为82%,抽吸或引流为87%,并发症发生率胸部为7.5%,腹部为0.06%,颅脑为7.5%。本文详细讨论了穿刺针选择,技术要点。影响正确率的因素等。  相似文献   

地理信息系统支持区域土地利用决策的研究   总被引：31，自引：1，他引：31  

黄杏元  倪绍祥 《地理学报》1993,48(2):114-121

本文以江苏省溧阳县为例,研究地理信息系统技术在区域土地利用多目标规划中的应用,着重探讨地理信息系统支持的区域土地利用决策原理和方法。研究表明,在地理信息系统的支持下,通过单项适宜性评价模型和生产布局决策模型的建立与运行,可以有效地进行研究区合理的土地利用布局和为区域土地管理提供依据。  相似文献   

准时间可预报复发行为与断裂带分段发震概率估计   总被引：7，自引：0，他引：7  

闻学泽 《中国地震》1993,9(4):289-300

反不确定性引入“时间可预报模式”，可将一次地震之后的平静时间表示成与这次地震位错量在小呈正相关的随机变量。称这种带有不确定性的地震原地复发行为为“准时间可预报行为”。对于历史地震资料，准时间可预报复发行为可由地震后平静时间的对数与地震烈度的回归方程。文中给出了估计一条枯断裂带不同段落以上一次地震烈度值为背景的平均复发时间间隔的方法，以及可用 于对未来地震潜势进行不确定评价的实时概率模型，并以鲜水河  相似文献