商丘2002年6月22～23日大到暴雨过程分析

通过对2002年6月22～23日商丘市大到暴雨过程的高度场、总温度和e-t等物理量的分析发现：此次降水过程是由西北向东南方向移动的，并且强度在逐渐减弱；高度场、总温度和e-t都较明显地预示了此次降水过程。     

Perceptible earthquakes in the broad Aegean area

A probabilistic estimate of seismic hazard can be obtained from the spatial distribution, of earthquake sources, their frequency–magnitude distribution and the rate of attenuation of strong ground motion with distance. We calculate the earthquake perceptibility, i.e. the annual probability that a particular level of ground shaking will be generated by earthquakes of particular magnitude, by weighting frequency–magnitude data with the predicted felt area for a given level of ground shaking at a particular magnitude. This provides an earthquake selection criterion that can be used in the anti-seismic design of non-critical structures. We calculate the perceptibility, at a particular value of isoseismal intensity, peak ground acceleration and velocity, as a function of source magnitude and frequency for the broad Aegean area using local attenuation laws. We use frequency–magnitude distributions that were previously obtained by combining short-term catalogue data with tectonic moment rate data for 14 tectonic zones in Greece with sufficient earthquake data, and where contemporary strain rates are available from satellite data. Many of the zones show a ‘characteristic earthquake’ distribution with the most perceptible earthquake equal to the maximum magnitude earthquake, but a relatively flat perceptibility between magnitudes 6 and 7. The maximum perceptible magnitude is in the fastest-deforming region in the middle of the Aegean sea, and tends to be systematically low on the west in comparison to the east of the Aegean sea. The tectonic data strongly constrain the long-term recurrence rates and lead to low error estimates (±0.2) in the most perceptible magnitudes.     

Simulations and analyses of train-induced ground vibrations in finite element models

Analyses of the actual vibration measurements and the results from the mathematical and numerical models have been performed in both the frequency and time domains. The conclusions from these analyses were that two-dimensional models could be used in order to study certain effects of train-induced ground vibrations, but that three-dimensional analyses are necessary to achieve a better simulation of the problem. All these analyses were linear elastic. It was, however, found in the three-dimensional analyses that relatively large shear strains existed in the embankment and in the soft soil layers just beneath the railway embankment. These shear strains were taken into consideration through iterative reduction of the shear modulus of the materials where large shear strains were calculated.     

遥感影像纠正控制点数据的综合管理

介绍了对控制点数据进行综合管理的必要性、思路；应实现的功能及在遥感影像几何精纠正的生产过程中应用控制点数据的方法。     

中条山北麓断裂形变异常的研究

叙述了山西地震带南端运城盆地及其周边100km范围近20a的地震活动特征，运用形变异常参数、差分、统计等方法对运城盆地内跨中条山北麓断裂的水准观测资料进行了研究。结果表明，断层大幅度形变速率异常变化较好地对应了研究区内1979年至2002年7次ML≥4.2的地震活动，且山西永济风柏峪测线自2001年8月至2002年4月仍存在一定的形变异常信息，表明，中条山北麓断裂目前正处于增强活动之中。     

根据震后结构破坏状态反演地面运动参数研究

提出了一种根据地震后的结构所呈现的破坏状态，运用结构破坏反演技术来确定地面运动参数的新方法。以钢筋混凝土框架结构为例，在对地震作用引入一些基本假定后，建立了根据震后结构破坏状态反演地面运动参数的数学模型；并进一步提出了一种前行步步比对法，给出了若干算例。结果表明该方法是可行的。最后还提出了进一步研究要解决的若干问题。     

Seismically induced landslide at Degirmendere Nose, Izmit Bay during Kocaeli (Izmit)-Turkey earthquake

This paper presents a study on the analyses of seismically induced landslide at Degirmendere Nose during the 1999 Kocaeli (Izmit)-Turkey earthquake. The paper discusses: (1) observed ground deformations and displacements after the earthquake, (2) the results of field investigations by means of borings and in situ index tests including standard penetration tests, static cone penetration tests (CPT) and piezocone tests, (3) analyses of observed landslide mechanisms by a suite of methods and (4) potential effects of soil liquefaction rupture on the observed landslide mechanism.     

Coastal failures during the 1999 Kocaeli earthquake in Turkey

During the 1999 Kocaeli earthquake (M_w=7.4) in Turkey, coastal failures and sea inundation were observed and were particularly concentrated along the margins of Izmit Bay and Lake Sapanca, in pull-apart basins created by stepovers in the fault rupture. Geotechnical site characterization, geologic mapping, liquefaction evaluation, and slope stability analysis were carried out to identify the principal contributing factors of the coastal failures. Results from this study indicate that both liquefaction and tectonic subsidence contributed to the failures and sea inundation within the pull-apart basins. Most of the liquefaction sites were situated at the prograding nose of active delta fans, where the presence of steep slopes coupled with the loose sediments found within young active delta fan deposits resulted in liquefaction-induced slope failures and sea inundation. Liquefaction in other coastal deposits outside the actively prograding delta fans caused limited lateral spreading and only minor sea inundation. Outside the delta fans, where soils were not liquefiable, tectonic subsidence associated with normal faulting was the cause of the observed sea inundation. Generally, tectonic subsidence caused the most severe sea inundation. Based on these observations, the identification of regions susceptible to both tectonic subsidence and liquefaction are important when evaluating seismic hazards.     

矿井瞬变电磁法探测井下工作面顶、底板的含水构造

将地面瞬变电磁法应用于煤矿井下，探测矿井下采煤工作面顶、底板的含水构造。对矿井瞬变电磁法的基础理论进行了分析，对矿井瞬变电磁法探测工作面顶、底板的含水构造应用技术进行了系统研究。