基于脉冲频响函数的MATLAB动力方程求解方法

提出一种基于脉冲频响函数并利用MATLAB求解的方法，由于脉冲频响函数利用卷积公式进行动力微分方法计算，因此，从理论上讲，它适合于任意外力下的动力方程求解，同时，MATAL又提供了卷积函数conv，所以，在MATLAB下求解动力方程将变得十分容易。     

最不利地震动在网壳结构抗震设计中的应用

利用文献提供的最不利地震动，对网壳结构等大跨空间结构进行了分析，分别考察了仅水平输入和三向地震波输入的两种情况，对最不利地震动在网壳结构抗震设计中的适用性进行了探讨，并在一实际工程设计中进行了应用。大跨度空间结构在水平地震动输入时，宜按照的最不利地震动进行设计；在三向地震动同时输入时，应同时分别按所推荐最不利设计地震动和按常规选用的地震动，对大跨度空间结构进行抗震分析。     

浅层次脆性变形域中煤层韧性剪切带微观分析

在研究煤层层间剪切与韧性流变的基础上提出浅层次脆性变形域中的煤层韧性剪切带. 煤层韧性剪切带的宏、微观特征不仅有煤层揉流褶皱、煤层糜棱岩带、煤层韧性面理构造等, 而且微观特征还表现为不同的光性组构与煤镜质组各向异性、煤化学结构的变化和有机地球化学成分的改变等. 分析了煤层韧性剪切带的形成机制, 并探讨了其应变环境: 在地壳浅层次脆性变形域中, 煤层受力后容易变形, 煤层不仅产生脆性变形, 而且也产生韧性剪切变形. 在简单剪切应力作用下煤层及其围岩间发生层间滑动或煤层发生韧性流动. 因此, 地壳浅层(< 5 km)能形成众多的煤层韧性剪切带.     

Exploration and Study on Deep Crust Structural Characteristics in the Jiashi-Artux Seismic Region

The data from two deep seismic sounding profiles was processed and studied comprehensively. The results show that crnst-mantle structures in the investigated region obviously display layered characteristics and velocity structures and tectonic features have larger distinction in different geological structure blocks. The boundary interface C between the upper and lower crust and Moho fluctuate greatly. The shallowest depths of C (30.0km) and Moho (45.5km) under Jiashi deepen sharply from Jiashi to the western Kunlun mountain areas, where the depths of C and Moho are 44.0km and 70.0km, respectively. The higher velocity structures in the Tarim massif determine its relatively “stable“ characteristics in crust tectonics. The phenomenon in the Jiashi region, where the distribution of earthquake foci mostly range from 20kin to 40kin in depth, may infer that the local uplift of C and Moho interface, anomalonsly lower velocity bodies and deep large faults control earthquake occurrence and seismogenic processes in the Jiashi strong earthquake swarm.     

松辽盆地南部十屋断陷古构造对营城组扇三角洲发育的控制

在恢复古构造的基础之上，对比了松辽盆地南部十屋断陷营城组沉积时期的古构造格局与现令构造格局的异同。古构造对扇三角洲沉积体系的控制作用主要表现在：(1)主要基底断裂控制了扇三角洲的展布方向；(2)倾向与物源方向相反的断层和古地貌阻滞了扇三角洲的展布；(3)沉降中心控制了扇三角洲前缘的纵向叠置和发育。     

鄂尔多斯盆地奥陶系马家沟组溶斑形成机理

鄂尔多斯盆地中部气田奥陶系马家沟组属蒸发边缘海相地层,其风化壳是中部气田的主要产气层段。该层中广泛发育毫米级、厘米级的溶斑,这些溶斑的产状、大小、成分以及溶孔内的充填物十分复杂,有的具多期充填,充填物为石膏、石英、方解石、白云石、高岭石、黄铁矿等多种矿物。溶斑中下半部残留的岩石经溶蚀后的白云石晶粒形成的渗流砂示底构造十分明显。研究表明,溶斑的形成不仅具有适宜的岩相古地理环境和其复杂的生成演化史,而且与原始沉积以及不同地史阶段的岩溶作用相关。     

皖北新元古代望山组震积岩的基本特征及其形成环境分析

皖北望山组碳酸盐岩中含有大量液化碳酸盐脉、液化变形、角砾岩等震积岩特征 ,是皖北新元古代地层中含震积岩的重要层位。根据震积岩的特征及其在剖面上的分布将望山组沉积期的地震活动分为三期 ;依据对该组碳酸盐岩的沉积特点的分析认为望山组沉积期的地震活动发生在浅海环境中。这些地震活动与新元古代华北板块内的构造—岩浆活动有关。     

鄱阳湖组(第四系)的修订及特征

根据对鄱阳湖地区 Zk0 1钻孔柱状剖面的研究 ,对鄱阳湖组的定义进行修订、补充 ,认为鄱阳湖组为一套以青灰色淤泥质粘土、黄褐色粘土、粉质粉土为主夹少量粉砂或细砂的湖泊—河口三角洲相沉积。年代地层为第四系全新统 ,底界年龄约 6 2 10± 12 5 a B.P.,开阔湖泊沉积始于 32 4 0± 180 a B.P.,且由北向南时代渐新 ,具有明显的穿时性     

The inversion of anelastic coefficient,source parameters and site respond using genetic algorithm

It gradually becomes a common work using large seismic wave data to obtain source parameters, such as seismic moment, break radius, stress drop, with completingof digital seismic network in China (Hough, et al, 1999; Bindi, et al, 2001). These parameters are useful on earthquake prediction and seismic hazard analysis.Although the computation methods of source parameters are simple in principle and the many research works have been done, it is not easy to obtain the parameters accurately. There are two factors affecting the stability of computation results. The first one is the effect of spread path and site respond on signal. According to the research results, there are different geometrical spreading coefficients on different epicenter distance. The better method is to introduce trilinear geometrical spreading model (Atkinson, Mereu, 1992; Atkinson, Boore, 1995; WONG, et al, 2002). In addition, traditional site respond is estimated by comparing with rock station, such as linear inversion method (Andrews, 1982), but the comparative estimation will introduce some errors when selecting different stations. Some recent research results show that site respond is not flat for rock station (Moya, et al, 2000; ZHANG,. et al, 2001; JIN, et al, 2000; Dutta, et al, 2001). The second factor is to obtain low-frequency level and corner frequency fromdisplacement spectrum. Because the source spectrum model is nonlinear function,these values are obtained by eye. The subjectivity is strong. The small change of corner frequency will affect significantly the result of stress drop.     

燕山地区中元古代常州沟组潜穴化石

在燕山地区中元古代常州沟组中发育有大量的潜穴化石，潜穴产于常州沟组中部的泥质粉砂岩中。潜穴呈个体较大的直管状，垂直层面保存。这是我国迄今为止发现的最古老的遗迹化石，表明在距今近1800Ma前就已出现古老的后生动物，这对于研究后生动物的起源及演化具有重要意义。