伽师强震群地震动特点与震源机制关系的研究   总被引：5，自引：0，他引：5  

郭明珠  毛志清  魏秀丽  胡成祥  于海英 《地震工程与工程振动》2002,22(1):28-31

1997年1至4月，新疆维吾尔自治区伽师县境内发生了7次6级以上强震群。在此期间布设了由4个临时台站组成的地面加速度观测台网，共得到6级以上强震记录57条。本文给出这次强震群的烈度分布图和震源机制，研究了这批强震记录的相关谱特性及其与震源机制的关系。此外，还研究了这些地震的地震动与宏观烈度的对应关系以及地震动随震中距的衰减曲线。  相似文献   

Seismic intensity investigation of the 2001 M =6.0 Yajiang-Kangding earthquake and discussion on its background of seismogenic structures     

He Yu-lin  Zhang Qin  Huang Wei 《地震学报(英文版)》2002,15(1):63-73

An M=6.0 earthquake occurred on February 23, 2001 in the western Sichuan Province, China. The macro seismic epicenter situated in the high mountain-narrow valley region between Yajiang and Kangding counties. According to field investigation in the region, the intensity of epicentral area reached VIII and the areas with intensity VIII, VII and VI are 180 km², 1 472 km² and 3 998 km², respectively. The isoseismals are generally in elliptic shape with major axis trending near N-S direction. The earthquake destroyed many buildings and produced some phenomena of ground failure and mountainous disasters in the area with intensity VIII. This event may be resulted from long-term activities of the Litang fault and Yunongxi fault, two main faults in the western Sichuan. The movements between the main faults made the crust stress adjusted and concentrated, and finally the earthquake on a secondary fault in the block released a quite large energy.  相似文献   

Erroneous interpretation of historical documents related to the epicenter of the 1927 Jericho earthquake in the Holy Land     

R. Avni  D. Bowman  A. Shapira  A. Nur 《Journal of Seismology》2002,6(4):469-476

The 1927 earthquake was the strongestseismic event (M = 6.2) of the 20th centuryin the Holy Land and the first significantone in the region to be recorded worldwideby seismometers. By quoting theseismological station in Ksara, the ISSlocated the epicenter 40 km north of theDead Sea. This location, which wassupported by secondary and tertiarymacroseismic `evidence' and became one ofthe most accepted `facts', was neverquestioned nor reevaluated.We show how an initial mistaken earthquakelocation, supported by questionableevidence, struck roots and eventually becamean accepted fact. This typical `chain oferrors' may serve as a warning regardingtreatment of historical macroseismicsources, as well as historical microseismicdocuments. The conclusions drawn from thisstudy, while focusing on historicaldocumentation, fit well the new epicenterof the 1927 earthquake, recalculated in ourformer study.  相似文献   

2001年5月24日四川盐源5.8级地震灾害及损失评估     

何玉林  王云基  杜国光  张勤 《四川地震》2002,(2):23-27

对2001年5月24日发生在四川盐源之5.8级地震灾情作了概述，这次地震宏观震中位于四川盐源县泸沽湖镇舍垮村一带，震中区烈度为Ⅶ度，个别点可达Ⅷ度，其中四川地区受灾面积达1130平方千米，受灾人口达9632户，48249人，地震造成1人死亡，39人受伤，5930人无家可归，其直接经济损失在9000万元左右，同时，位于震区外围的木里县城所在地-乔瓦镇因位于老滑坡地带，成为灾害异常区，从而使建筑物遭受较大的损坏。  相似文献   

花岗岩动三轴抗压强度的裂纹模型研究（I）：理论基础   总被引：3，自引：0，他引：3  

李海波  赵坚等 《岩土力学》2002,23(1):75-80

简要地介绍了岩石材料在压应力作用下的裂纹模型。应用虚拟力方法(Pseudo-tractionmethod)考虑2阶虚拟力情形,求解裂纹组应力强度因子表达式,为岩石动三轴抗压强度的裂纹模型研究提供理论基础。  相似文献   

土地利用的人地关系透视   总被引：4，自引：1，他引：4  

王爱民  刘加林  缪磊磊 《地域研究与开发》2002,21(1):9-12,17

人地关系的协调是可持续发展战略的基本内容，土地利用是人地关系的核心问题。文章基于对土地综合体属性的把握，分析了土地在人地系统中的基础作用。不同的土地利用类型决定了人地系统的属性特征具有自然和社会两重属性。从土地开发的历史角度探讨了人类系统的发展及其在人地关系构建中的主导作用，最后得出了人地系统的作用机制。  相似文献   

巫山县近30a来土地利用动态变化及过程     

马泽忠  周万村  江晓波  周爱霞  李爱农 《山地学报》2002,(Z1)

用MSS底片和TM图像作为数据源,通过扫描成像、假彩色合成和空间配准以形成彩色遥感图像。RS和GIS相结合,从卫星图像解译出土地资源利用类型,利用ARC/INFO进行自动统计,并输出各类土地面积,对巫山县近30a来土地利用动态变化进行研究。得出巫山县30a的土地利用变化和环境变化规律,并对造成这种变化的驱动力进行探讨和分析。为今后更加合理地利用土地和相关土地政策的制定提供了决策支持。  相似文献   

The land use and land cover change database and its relative studies in China   总被引：3，自引：0，他引：3  

LIU Jiyuan  LIU Mingliang  DENG Xiangzheng  Zhuang Dafang  ZHANG Zengxiang  LUO Di 《地理学报》2002,12(3):275-282

In the mid-1990s, we established the national operative dynamic information serving systems on natural resources and environment. During building the land-use/land-cover change (LUCC) database for the mid-1990s, 520 scenes of remotely sensed images of Landsat Thematic Mapper (TM) were interpreted into land-use/land-cover categories at scale of 1:100,000 under overall digital software environment after being geo-referenced and ortho-rectified. The vector map of land-use/land-cover in China at the scale of 1:100,000 was recently converted into a 1-km raster database that captures all of the high-resolution land-use information by calculating area percentage for each kind of land use category within every cell. Being designed as an operative dynamic information serving system, monitoring the change in land-use/land-cover at national level was executed. We have completed the updating of LUCC database by comparing the TM data in the mid-1990s with new data sources received during 1999-2000 and 1989-1990. The LUCC database has supported greatly the national LUCC research program in China and some relative studies are incompletely reviewed in this paper.  相似文献   

岩石边坡裂隙渗流的流形元模拟   总被引：1，自引：0，他引：1  

刘红岩  王新生  秦四清  阮浩 《工程地质学报》2008,16(1):53-58

为了能够更好地考虑裂隙渗流在岩石边坡破坏中的作用,在考虑裂纹扩展的数值流形方法程序基础上,从最小势能原理出发,阐述了渗流与变形的耦合作用机理并推导了相应的耦合方程,在程序中实现了对渗流与断裂的模拟。最后利用该程序对含初始裂隙的岩石边坡在渗流作用下的破坏过程进行了模拟。模拟结果很好地再现了边坡在渗流作用下的实际破坏过程。同时通过对裂纹扩展过程中应力强度因子的计算发现,第一应力强度因子始终大于第二应力强度因子,且随着计算时间增加,二者的差值逐渐增大,裂纹扩展以Ⅰ型为主。  相似文献   

增大击实功的击实试验研究          下载免费PDF全文

李敏  赵家胜  韩召峰 《江苏地质》2008,32(2):148-150

压实度是路基填筑时控制路基强度和稳定性的关键指标。通过室内试验研究了击实功对路基压实度的影响。结果表明,增大击实功,路基土的最大干密度和7d无侧限抗压强度都有显著提高,抗压强度最大增幅达到50％左右。因此增加路基土的密实度,可以明显地提高路基土的强度,延长路基的使用寿命。  相似文献