新10号泉溶解气的变化特征及与地震的对应关系

对新疆新10号泉溶解气的变化特征进行了研究。通过对13组MS≥4.6地震的分析可以看出:(1)深、浅源气体的异常形态和异常时间有所差别;(2)不同气体各有其异常特点,同源气体的同步性很好。在所统计的13组15次地震中,来自深源的CH4、He震前发生异常次数分别是11次和10次,两者同步的有9次,它们异常起始时间接近,异常形态都表现为趋势性中短期异常;来自浅源的Ar、N2映震率接近,15次地震前Ar异常有4次,N2异常为3次,两者同步性好,以高值异常为主,短临异常明显;来自深、浅源的混合气体CO2多表现为趋势性高值中短期异常,在恢复背景值的过程中发震。     

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。     

Regional time-predictable modeling in the Hindukush–Pamir–Himalayas region

The seismic characteristic of Hindukush–Pamir–Himalaya (HPH) and its vicinity is very peculiar and has experienced many widely distributed large earthquakes. Recent work on the time-dependent seismicity in the Hindukush–Pamir–Himalayas is mainly based on the so-called “regional time-predictable model”, which is expressed by the relation log T=cM_p+a, where T is the inter-event time between two successive main shocks of a region and M_p is the magnitude of the preceded main shock. Parameter a is a function of the magnitude of the minimum earthquake considered and of the tectonic loading and c is positive (0.3) constant. In 90% of the cases with sufficient data, parameter c was found to be positive, which strongly supports the validity of the model. In the present study, a different approach, which assumes no prior regionalization of the area, is attempted to check the validity of the model. Nine seismic sources were defined within the considered region and the inter-event time of strong shallow main shock were determined and used for each source in an attempt at long-term prediction, which show the clustering and occurrence of at least three earthquakes of magnitude 5.5≤M_s≤7.5 giving two repeat times, satisfying the necessary and sufficient conditions of time-predictable model (TP model). Further, using the global applicability of the regional time- and magnitude-predictable model, the following relations have been obtained: log T_t=0.19 M_min+0.52M_p+0.29 log m₀−10.63 and M_f=1.31M_min−0.60M_p−0.72 log m₀+21.01, where T_t is the inter-event time, measured in years; M_min the surface wave magnitude of the smallest main shock considered; M_p the magnitude of preceding main shock; M_f the magnitude of the following main shock; and m₀ the moment rate in each source per year.

These relations may be used for seismic hazard assessment in the region. Based on these relations and taking into account the time of occurrence and the magnitude of the last main shock in each seismogenic source, time-dependent conditional probabilities for the occurrence of the next large (M_s≥5.5) shallow main shocks during the next 20 years as well as the magnitudes of the expected main shocks are determined.     

辽阳市区软土的工程地质特征

辽阳市区地表浅部呈透镜状断续分布的松软土体———淤泥质粉质粘土为静水或缓慢流水环境沉积,经生物化学作用而形成的。本文对其分布、形成、物质结构及工程地质特性进行了较系统的描述。并依据大量现场测试及室内土工试验成果,分析论述了该层软土天然独特的含水量高,孔隙比大,强度低,压缩性高,具触变性及承载力低的工程地质特性对勘察施工及建筑物稳定性的不良影响,提出了避让、挖除、选择合适桩型等科学合理的工程处理建议。     

阿克苏地区高密度高产棉花农业气象服务指标的研究

通过对阿克苏地区150kg高密度高产棉花栽培试验的观测和分析，系统研究地区高密度高产棉花栽培技术中几个重要环节的农业气象服务指标。     

昆仑山口西8.1级地震前地下流体异常特征

通过对青海省水氡共7个台项观测资料及4个前兆数字化观测点的12个测项（水氡、水位、水温或地热）观测资料的分析，初步2001年11月14日青海省昆仑山口西8．1级地震前存在部分异常，但异常的比例不高，未见明显趋势性异常。格尔木新建数字化地热仪观测到了较突出的同震效应。     

2001—08—07河南省局地强风暴天气过程分析

2001年8月7日冷锋过境前河南中部出现了局地雷雨大风，冰雹，龙卷及短时强降水天气过程。分析结果表明：地面高温高湿，为强风暴的发生提供了热力条件；高层冷平流，低层暖平流提供了层结条件；地面流场上风向辐合提供了动力条件。强风暴出现在高能区，并在高能区传播和移动。雷达回波的反射率因子特征为强度强，高度高，移速快；强回波位于移动方向前方，弱回波位于移动方向后方。平均径向速度场特征为辐合系统和气旋性辐合系统，垂直剖面图上，低层有明显的辐合界面。     

新疆塔里木河油田工程地质及工程地震特征研究

塔里木河油田建筑工程场地以冲、风积形成的粉细砂、粉质粘土为主 ,地下浅水位为 2— 4 m。由于该地区属大陆型干燥气候 ,强烈的蒸腾作用使大量盐碱聚集在地表形成易溶盐富集层 ,这对建筑基础具有强腐蚀作用。建筑工程场地属 类 ,场地土为软弱土类型。场地特征周期 Tg 为 0 .6 s,属远震影响。     

Impacts of September 21, 1999 Chi-Chi earthquake on the characteristics of gully-type debris flows in central Taiwan

Debris flows are more frequent in central Taiwan, because of its mountainous geography. For example, many debris flows were induced by Typhoon Herb in 1996. The Chi-Chi earthquake with a magnitude of 7.3, which took place in 1999 in central Taiwan, induced many landslides in this region. Some landslides turned into debris flows when Typhoon Toraji struck Taiwan in 2001. This study investigates the characteristics of the gullies where debris flows have occurred for a comparison. Aerial photos of these regions dated in 1997 (before the earthquake) and 2001 (after the earthquake) are used to identify the occurrence of gully-type debris flows. A Geographic Information System (GIS) is applied to acquire hydrological and geomorphic characteristics: stream gradient, stream length, catchment gradient, catchment area, form factor, and geology unit of these gullies. These characteristics in different study regions are presented in a statistical approach. The study of how strong ground motion affects the debris flows occurrence is conducted. The characteristics of the debris flow gullies triggered by typhoons before and after the Chi-Chi earthquake are quantitatively compared. The analysis results show that a significant transformation in the characteristics was induced by the Chi-Chi earthquake. In general, the transformation points out a lower hydrological and geomorphic threshold to trigger debris flows after the Chi-Chi earthquake. The susceptibility of rock units to strong ground motion is also examined. The analysis of debris flow density and accumulated rainfall in regions of different ground motion also reveal that the rainfall threshold decreases after the Chi-Chi earthquake.