Multi-scale wavelet separation of aeromagnetic anomaly and study of faults in Beijing area     

张先 赵丽刘天佑  杨宇山 《地震学报(英文版)》2006,19(5):542-551

Introduction As the capital of China, Beijing is a major political, economic and cultural center. In 2008, it will host the Olympic Games. Therefore, Beijing is of great importance in our national undertak-ing in guarding against earthquakes and reducing their damages. The Chinese Capital Circle re-gion has always been attached great importance in monitoring earthquakes by the China Earth-quake Administration, and as the kernel of the Capital Circle region, Beijing is the key area for ea…  相似文献   

东亚南北地震带大震活动性研究   总被引：6，自引：0，他引：6  

黄圣睦  董瑞英  张永久 《地震研究》2006,29(3):304-311

根据中国南北地震带与青藏-印尼“歹”字型构造带在成因上的联系，提出东亚南北地震带的观点，认为该地震带包含蒙古、中国西部、缅甸和印尼苏门答腊地区。研究了该带大地震活动的同步性、主体活动区的有序转移、大地震之间的多次相关迁移与重复等特征，并划分出了该带的5个大震活跃幕：1887-1912年、1913-1937年、1938-1957年、1958-1976年、1977-2005年。苏门答腊2004年12月26日8．7级和2005年3月29日8．5级巨震标志着该地震带最近一次以主体活动区南移到苏门答腊为特征的活跃时段即将结束。尽管未来一、两年内地震带的中部存在发生7级地震的有利时段，但结合强震图像异常指标反映的孕震状况分析，未来7级地震危险区尚不明朗。  相似文献   

近14a也门降水异常的气候特征          下载免费PDF全文

加买尔  龚  陆维松 《大气科学学报》2006,29(6):847-849

利用1990-2003年也门7个测站降水资料,在分析近14 a也门降水季节变化特征的基础上,着重分析了也门夏季降水的年际变化特征。结果表明,也门降水异常的季节变化明显,异常在4-9月最大,尤其是7-9月,异常峰值所在月呈现出较明显的提早趋势;近14 a也门夏季降水呈现出增加的趋势,90年代末该趋势加大;近14 a也门夏季降水存在3 a和7 a左右的显著振荡周期。  相似文献   

内蒙巴林左旗Ms5.9地震与朝阳-北票断裂的垂直形变     

杨玉光  吴庆明  孔德民  王维远 《东北地震研究》2006,22(4):35-39

本文分析了朝阳地震台水准观测在内蒙巴林左旗Ms5.9地震前的短临异常,并对异常机理进行了初步探讨。  相似文献   

Turbulent fluxes from Helipod flights above quasi-homogeneous patches within the LITFASS area     

Jens Bange  Thomas Spieß  Marcus Herold  Frank Beyrich  Barbara Hennemuth 《Boundary-Layer Meteorology》2006,121(1):127-151

Turbulent fluxes of sensible and latent heat were measured with the helicopter-borne turbulence probe Helipod over a heterogeneous landscape around the Meteorological Observatory Lindenberg during the STINHO-2 and LITFASS-2003 field experiments. Besides the determination of area-averaged heat fluxes, the analysis focused on different aspects of the response of the turbulent structure of the convective boundary layer (CBL) on the surface heterogeneity. A special flight pattern was designed to study flux profiles both over quasi-homogeneous sub-areas of the study region (representing the major land use types—forest, farmland, water) and over a typical mixture of the different surfaces. Significant differences were found between the heat fluxes over the individual surfaces along flight legs at about 80 m above ground level, in agreement with large-aperture scintillometer measurements. This flux separation was still present during some flights at levels near the middle of the CBL. Different scales for the blending height and horizontal heterogeneity were calculated, but none of them could be identified as a reliable indicator of the mixing state of the lower CBL. With the exception of the flights over water, the latent heat flux measurements generally showed a larger statistical error when compared with the sensible heat flux. Correlation coefficients a nd integral length scales were used to characterise the interplay between the vertical transport of sensible and latent heat, which was found to vary between ‘fairly correlated’ and ‘decoupled’, also depending on the soil moisture conditions.  相似文献   

Processing and quality control of flux data during LITFASS-2003   总被引：1，自引：0，他引：1  

Matthias Mauder  Claudia Liebethal  Mathias Göckede  Jens-Peter Leps  Frank Beyrich  Thomas Foken 《Boundary-Layer Meteorology》2006,121(1):67-88

Different aspects of the quality assurance and quality control (QA/QC) of micrometeorological measurements were combined to create a comprehensive algorithm which was then applied to experimental data from LITFASS-2003 (Lindenberg Inhomogeneous Terrain—Fluxes between Atmosphere and Surface: a long term Study). Eddy-covariance measurements of the latent heat flux were the main focus of the QA/QC efforts. The results of a turbulence sensor intercomparison experiment showed deviations between the different eddy-covariance systems on the order of 15%, or less than 30 W m⁻², for the latent heat flux and 5%, or less than 10 W m⁻², for the sensible heat flux. In order to avoid uncertainties due to the post-processing of turbulence data, a comprehensive software package was used for the analysis of experimental data from LITFASS-2003, including all necessary procedures for corrections and quality control. An overview of the quality test results shows that for most of the days more than 80% of the available latent heat flux data are of high quality so long as there are no instrumental problems. The representativeness of a flux value for the target land-use type was analysed using a stochastic footprint model. Different methods to calculate soil heat fluxes at the surface are discussed and a sensitivity analysis is conducted to select the most robust method for LITFASS-2003. The lack of energy balance closure, which was found for LITFASS-2003, can probably be attributed to the presence of low-frequency flux contributions that cannot be resolved with an averaging time of 30 min. Though the QA/QC system has been developed for the requirements of LITFASS-2003, it can also be applied to other experiments dealing with similar objectives.  相似文献   

红粘土地区水泥土强度的试验研究   总被引：7，自引：0，他引：7  

郭培玺  阮怀宁 《岩土工程技术》2006,20(3):132-135

红粘土是亚热带气候条件下形成的一种特殊土质。含有红粘土的地基多具有上硬下软的特点,下部红粘土为天然地基软弱下卧层。采用深层搅拌法处理,可充分发挥上部硬塑红粘土的作用,形成复合地基。通过试验得到了水泥红粘土的基本力学参数。在对试验结果进行回归分析后,给出了水泥土强度的影响因素及其与强度的关系,以及不同水泥掺量、龄期水泥土之间的强度推算公式。  相似文献   

甘肃代家庄铅锌矿床地球化学异常特征   总被引：2，自引：0，他引：2       下载免费PDF全文

张忠平 《甘肃地质》2006,15(2):42-47

代家庄铅锌矿床是通过区域化探异常查证工作,在西秦岭地区发现的SEDEX型铅锌矿床。本文根据代家庄矿区水系沉积物、土壤和岩石剖面测量结果,对Pb、Zn等成矿元素的分布特征和组合关系进行了分析,初步总结了代家庄铅锌矿床的地质和地球化学异常特征,归纳出该矿床的地球化学找矿标志,提出了找矿方向。  相似文献   

内蒙古东乌旗哈巴特盖银多金属矿土壤地球化学异常特征     

夏广清 《地质找矿论丛》2006,21(10):144-148

哈巴特盖测区1／5万土壤地球化学测量发现了4个异常区，多元素组合异常多分布在黑云母二长花岗岩的内、外接触带上，土壤地球化学异常特征显示本区成矿是多期次的，多元素组合异常在露头矿和盲矿上方均有出现，且异常连续、浓集中心明显，异常的强度和规模大，呈带状、宽带状或面状产出。  相似文献   

Towards urbanisation of the non-hydrostatic numerical weather prediction model Lokalmodell (LM)     

Lina Neunhäuserer  Barbara Fay  Matthias Raschendorfer 《Boundary-Layer Meteorology》2007,124(1):81-97

Numerical weather prediction models are increasingly employed for providing meteorological data for urban air quality applications. Model resolution, physiographic parameters and surface-layer parameterisations need to be adapted to the requirements of the urban boundary layer. The Lokalmodell of the German Weather Service was triple-nested down to a horizontal grid resolution of 1.1 km, urbanised physiographic parameters were implemented, and an additional anthropogenic heat source was introduced. Results of a sensitivity study for a spring dust episode in Helsinki show a clear urbanisation effect of these measures on temperature, humidity and the partitioning of surface fluxes, leading to an increased Bowen ratio and heat storage and an urban heat island effect.  相似文献