黑龙江及邻区地壳应力场初步研究

采用综合震源机制方法,利用5 002条P波极性数据反演黑龙江地区二维应力结构,求得该区0.5°×0.5°综合震源机制解.初步研究表明：21世纪以来,构造应力场总特征基本一致,具有明显的继承性,主压应力和主张应力的优势方向明显,与板块运动关系具有成因上的联系.     

Land cover mapping using time series HJ-1/CCD data

It is very difficult to have remote sensing data with both high spatial resolution and high temporal frequency; thus, two categories of land-use mapping methodology have been developed separately for coarser resolution and finer resolution data. The first category uses time series of data to retrieve the variation of land surface for classification, which are usually used for coarser resolution data with high temporal frequency. The second category uses fine spatial resolution data to classify different land surface. With the launch of Chinese satellite constellation HJ-1in 2008, four 30 m spatial resolution CCDs with about 360 km coverage for each one onboard two satellites made a revisit period of two days, which brought a new type of data with both high spatial resolution and high temporal frequency. Therefore, by taking the spatiotemporal advantage of HJ-1/CCD data we propose a new method for finer resolution land cover mapping using the time series HJ-1/CCD data, which can greatly improve the land cover mapping accuracy. In our two study areas, the very high resolution remote sensing data within Google Earth are used to validate the land cover mapping results, which shows a very high mapping accuracy of 95.76% and 83.78% and a high Kappa coefficient of 0.9423 and 0.8165 in the Dahuofang area of Liaoning Province and the Heiquan area of Gansu Province respectively.     

网上房地产信息查询系统的设计

针对房地产信息查询的特点,设计了一个具有图形操作功能的查询系统,该系统具有图形操作、房产信息查询、三维显示与漫游等功能,可以较好地为用户提供网上查询服务。     

Discussion of paper ‘Simulation of floor response spectra in shake table experiments’ by G. Maddaloni,K. P. Ryu and A. M. Reinhorn,Earthquake Engineering and Structural Dynamics 2011; 40(6): 591‐604

Three main topics including the floor motion action mechanism, the test frame design, and the target spectrum simulation presented in the paper are discussed specifically. Floor motion action mechanism is critical in understanding the seismic performance of architectural nonstructural components. Seismic sensitiveness and earthquake response properties of the nonstructural components should be considered in the design of the test frame for the shaking table test. Target spectrum simulation is also a challenging job in the shaking table test, in which dynamic characteristics of the specimen, performance of the shaking table facilities, and the control techniques should be all considered. Copyright © 2011 John Wiley & Sons, Ltd.     

2008年3月21日新疆于田7.4级地震序列特征及震前部分地震学异常特征

The parameters,stress field background,geological tectonics and seismic sequence of the March 21,2008,M_S 7. 4 Yutian,Xinjiang earthquake are discussed in this paper. The characteristics of seismic activity in the epicenter and its adjacent region before the earthquake are analyzed; and a comparison is made between the M_S 7. 4 Yutian earthquake sequence,the Wenchuan M_S 8. 0 earthquake sequence and the Wuqia M_S 6. 9 earthquake sequence. The results show the M_S 7. 4 Yutian earthquake occurred in the junction between the Altyn Tagh fault and the western Kunlun fault,resulting perhaps from the tensile fracture of the branch fault located southwest of the Ashikule basin due to left-1ateral dislocation of the Altyn Tagh fault; the seismic sequence is of main shock-aftershock type, the strongest aftershock being M_S 5. 8. The aftershocks attenuated quickly,and occurred in groups; the focal mechanism solutions and epicenter distribution have revealed a unilateral rupture source of this earthquake. Seismic activity shows that there was medium and medium-short term abnormity before the earthquake,but there was not short-imminent abnormity. Seismic activity of this earthquake sequence enhanced before the M_S 8. 0 Wenchuan and the M_S 6. 9 Wuqia earthquakes,showing the window effect to some extent.     

Unsteady inter-porosity flow modeling for a multiple media reservoir

The paper deals with unsteady inter-porosity flow modeling of underground fluid in a multiple media reservoir. Assuming spherical vugs, symmetrically distributed pressure, negligible inter-porosity flow between matrix and vug systems and centrifugal flow of the fluid from matrix blocks or vugs to fractures, and treating media directly connected with wellbore as the fracture system, we establish and solve a model of unsteady inter-porosity flow for dual and triple porosity media reservoirs. We provide simulated graphs of pressure and pressure derivative log-log type curves, and analyze the transient flow process and characteristics of type curves affected by different parameters. The new type curves of unsteady inter-porosity flow modeling are evidently different in shape and characteristics from those of pseudo-steady inter-porosity flow modeling. The location of dimensionless pressure of unsteady inter-porosity is lower than that of pseudo-steady inter-porosity, which indicates that unsteady inter-porosity flow accelerates an energy supplement during production. Qualitatively, the unsteady inter-porosity flow modeling reduces the classical V-shaped response. We also estimated parameters from well test data in real applications using this model.     

塔里木盆地腹地晚新生代沉积序列的超细粒组分记录及其古气候意义

对红白山剖面的粒度分析表明,塔里木盆地腹地晚新生代沉积物的粒度曲线中普遍存在一个超细粒组分。其众数粒径分布比较稳定,平均为0.87μm,含量变化介于0.3%～10%,在不同成因的沉积物中和在剖面上都具有明显的变化规律。对同一岩性段而言,超细粒组分含量在风成砂中最低,在黄土中较低,在河流相沉积中较高,在湖相泥岩中最高。尽管受岩性变化的影响比较显著,但不同成因沉积物的超细粒组分含量在剖面上的变化基本一致,暗示了其长周期变化受同一驱动因子控制。化学风化和/或成壤作用强度可能起着关键作用。红白山剖面超细粒组分含量在2.8Ma的快速降低指示了化学风化和/或成壤作用强度的显著减弱,进而反映了塔里木盆地腹地干旱化的显著加强。     

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5·12汶川地震龙门山风景区地震次生山地灾害特征与处理

5·12汶川地震激发了龙门山风景区崩塌、滑坡、泥石流、堰塞湖等链状次生山地灾害.通过应急调查发现,该区已有堰塞湖5处,危害性崩塌、滑坡6处,已成灾泥石流沟1条,潜在泥石流沟11条,根据各处灾害的主要特征,确定堰塞湖的危险程度,提出山地灾害处理建议.     

水电工程坝址区构造应力场三维数值反演

以水电工程实例为背景,在现场调查和地应力测量的基础上,采用三维数值技术对水电站坝址区小范围内构造应力场进行了反演分析,通过对三维模型施加不同量值、不同方向的边界载荷,对比分析应力拟合点处的计算主应力与实测主应力之间的差别,从而得到最合理的边界载荷的量值和方向,即为坝址区构造应力场的量值和方向。计算结果表明：水电站坝址区构造应力场σ₁方向为S50°－60°E,量值为6～7 MPa;σ₃方向为N50°－60°E,量值为3～4 MPa。反演计算得到的坝址区构造应力场方向与区域应力场方向吻合,主应力量值也在合理范围内。