Study on correlativity among some seismological prediction indexes related to earthquake frequency or energy

Introduction Study of seismicity indexes and prediction methods is an important aspect of earthquake pre-diction research. In recent years, with more and more seismicity indexes being presented and de-veloped, a question is naturally put forward that which ones among so many seismicity indexes are dependent and which ones are independent when they are used to describe seismicity changes. The author studied the correlativities among several non-linear prediction indexes, such as capacity dimens…     

兴海6．6级地震前地震活动异常图像与序列主要特征

兴海6．6级地震异常特征典型，从背景空区、孕震空区、大面积震群活动到地震条带、前震序列，长、中、短期地震活动性异常配套。该地震序列无论从其能量释放比、震级差，还是序列参数计算均符合主震－余震型判断指标，根据全序列特征，该地震为前震－主震－余震型序列。     

2000年9月12日兴海6.6级地震宏观烈度及地震构造

2 0 0 0年 9月 1 2日青海省海南州兴海县发生 6 6级地震 ,宏观震中位于温泉乡的博荷沁沟及扎麻隆沟分水岭地带 ( 3 5°2 4′N ,99°3 2′E)。极震区烈度为Ⅷ度 ,震害以地震地表裂缝、山体崩塌及房屋倒塌为主。主震的发震断裂为鄂拉山 -温泉断裂带     

DIAGNOSTIC ANALYSIS ON THE DYNAMICS AND NUMERICAL SIMULATION OF CLEAR AIR TURBULENCE(CAT)

Clear air turbulence(CAT),a meso-or microscale(subgrid scale)phenomenon occurring insynoptic scale flow field at high altitude,is very difficult to be observed by the conventional obser-vation network.Thus it is necessary to approach an index to predict CAT.But at first,the struc-ture characteristics of CAT should be preanalyzed.In this paper,based on the theoretical and diag-nostic analysis of a case,features for wind profile,energy budget and dynamic mechanism of thiscase were presented.Furthermore,an objective and quantitative index for CAT forecast was giv-en.The verification for its efficiency was done with both real-time observation data and productsfrom a numerical model.The results are very encouraging.     

机助DTM计算体积的方法

利用全站仪测得的堆物表面离散特征点的”三维坐标（Ｘ，ｙ，ｈ），通过计算机自助排序的方法建立三角形覆盖网，再用平面切割的方法求定任一高度的面积，最后求得堆物体积。     

水资源评价指标体系研究

在近20年来不同流域和地区水资源评价工作的基础上,指出若干具有普遍意义、待研究改进的新问题,提出了包括自然、人文、经济、管理等方面的简要评价指标体系,应用两种计算方法,并选取国内7个县市为代表进行了试评价分析.     

察尔汗盐湖首采区含钾卤水水量水质模拟

察尔汗盐湖是一个以钾、镁为主，伴有多种非金属矿床的大型现代盐湖。赋存于盐层中的晶间卤水是我国目前钾肥生产的主要原料。作者根据当地的水文地质条件，建立了盐湖首采区含钾卤水的水量水质模型，其中用一级反应表示各离子间的固液转化效应，并采用特征有限元法求解包括反应项的对流－弥散方程。模拟结果具有较高的仿真性。     

Influence of slow active faults in probabilistic seismic hazard assessment: the northwestern margin of the València trough

Areas of low strain rate are typically characterized by low to moderate seismicity. The earthquake catalogs for these regions do not usually include large earthquakes because of their long recurrence periods. In cases where the recurrence period of large earthquakes is much longer than the catalog time span, probabilistic seismic hazard is underestimated. The information provided by geological and paleo-seismological studies can potentially improve seismic hazard estimation through renewal models, which assume characteristic earthquakes. In this work, we compare the differences produced when active faults in the northwestern margin of the València trough are introduced in hazard analysis. The differences between the models demonstrate that the introduction of faults in zones characterized by low seismic activity can give rise to significant changes in the hazard values and location. The earthquake and fault seismic parameters (recurrence interval, segmentation or fault length that controls the maximum magnitude earthquake and time elapsed since the last event or T_e) were studied to ascertain their effect on the final hazard results. The most critical parameter is the recurrence interval, where shorter recurrences produce higher hazard values. The next most important parameter is the fault segmentation. Higher hazard values are obtained when the fault has segments capable of producing big earthquakes. Finally, the least critical parameter is the time elapsed since the last event (T_e), when longer T_e produces higher hazard values.     

Labour market flexibility in UK regions, 1979–1998

Despite the centrality of the issue of labour market flexibility, attempts to consistently measure levels of flexibility, either within or across countries, have been remarkably scarce. This paper makes a significant contribution towards filling this gap by presenting a set of labour market flexibility indicators for the UK. Derived from survey-data sources, the indexes relate directly to theoretical considerations on the issue of flexibility and cover a 20-year period (1979–1998) at sub-national detail (Standard Statistical Regions). Examination of their temporal evolution and regional variation reveals a number of interesting findings, most notably that increases in flexibility have not been uniform across space and that persistent regional differences exist in functional specialisations in flexibility with the most significant pattern of regional differentiation being not in the levels of (overall) flexibility but in the types of flexible arrangements that prevail in each region.     

新疆塔河油田至轮台县火车站集输管道工程地质及工程地震条件分析

塔河油田至轮台县火车站集油气管道全长72km，近南北向，横跨了不同的4个地质单元，工程地质条件复杂，分布有Ⅰ、Ⅱ、Ⅲ类建筑场地。油气管道横跨了地震Ⅵ度与Ⅶ度区。场地土除末站冲洪积扇外，其余均屑盐渍土，对建筑基础有强腐蚀性。