Correlation study between ground motion intensity measure parameters and deformation demands for bilinear SDOF systems     

王建民  朱晞 《地震学报(英文版)》2006,19(1):78-86

The correlation between ground motion intensity measures （IM） and single-degree-of-freedom （SDOF） deformation demands is described in this study. Peak ground acceleration （APG）, peak ground velocity （VPG）, peak ground displacement （DPG）, spectral acceleration at the first-mode period of vibration [As（T1）] and ratio of VPG to APG are used as IM parameters, and the correlation is characterized by correlation coefficients p. The numerical results obtained by nonlinear dynamic analyses have shown good correlation between As（T1） or VPG and deformation demands. Furthermore, the effect of As（T1） and VPG as IM on the dispersion of the mean value of deformation demands is also investigated for SDOF systems with three different periods T=0.3 s, 1.0 s, 3.0 s respectively.  相似文献   

Study on financial loss and its adjustment in earthquake insurance     

刘如山  王自法朱敏 《地震学报(英文版)》2006,19(2):207-216

Introduction Earthquake often brings large catastrophe to the mankind, especially in recent years when a large number of destructive earthquakes occur in the whole globe, which have caused tremendous casualties and losses to the people. Obviously, it is not very reasonable to make up financial losses and carry out post-seismic reconstruction by the government only for such kind of huge earth- quake losses. Therefore, as an effective measure to raise fund and make up financial losses, earth- qu…  相似文献   

A network communication and recording system for digital seismic observation     

王洪体  庄灿涛薛兵李江  陈阳朱小毅  娄文宇刘明辉 《地震学报(英文版)》2006,19(5):581-587

Introduction Digital seismic observation systems originated from 1970′s. It has developed greatly in the past 30 years up to now. Its performances were improved, dynamic range and resolution increased a lot, the power consumption decreased a lot, and so on (YOU et al, 2003a, b). In a word, the dream of broad frequency-band, big dynamic range, digitalization of seismic observation has come true already. But, the previous digital seismic observation systems only support communica-tion based o…  相似文献   

Intercalibration of international and domestic ~(40)Ar/~(39)Ar dating standards   总被引：3，自引：0，他引：3  

WANG Fei  HE Huaiyu  ZHU Rixiang  SANG Haiqing  WANG Yinglan  YANG Liekun 《中国科学D辑(英文版)》2006,49(5)

40Ar/39Ar method is a high precision dating means, of which the age is obtained by contrasting the un- known sample with those of standards. Usually the age of standard is determined by K-Ar method in which the 38Ar spike should be added for measurement. However, the absolute concentration of 38Ar spike is measured through the calibrated standards in turn, al- though occasionally the concentration of 38Ar spike is determined by other dating methods, such as Rb-Sr, U-Pb methods, which is kn…  相似文献   

浙江及邻区尾波Q值研究   总被引：8，自引：3，他引：8       下载免费PDF全文

朱新运  张帆 《地震工程学报》2006,28(2):108-113

基于单次散射(Aki)模型,利用2000年至今浙江及安徽台网记录的37次ML3.0以上地震的数字地震波资料,计算了浙江及邻近省区平均尾波Q值,并拟合了Q值对频率的依赖关系数据。结果为:Q(f)=212±33.5f0.62±0.11,与国内其它区域相比,本区域为Q值高值、对频率低依赖性区域。认为本研究区内构造活动弱,地震活动水平低。本文就Q值对频率、尾波窗长等的依赖性特征及影响Q值计算的噪声水平、滤波器、数据采样等因素进行了深入分析。  相似文献   

“资源一号”卫星星内粒子探测器对扰动事件的观测   总被引：4，自引：2，他引：4       下载免费PDF全文

邹鸿  肖佐  郝永强  邹积清  仲维英  吴中祥  向宏文  朱文明 《地球物理学报》2006,49(3):636-641

本文比较了在太阳平静和扰动时期“资源一号”卫星星内粒子探测器对卫星舱内高能粒子的观测结果，发现在平静时期观测结果很好地反映了辐射带高能粒子在该高度上的分布情况.在扰动时期，粒子探测器观测到高能粒子分布出现重大变化，本文进一步讨论了影响高能粒子在近地空间分布的可能因素.  相似文献   

The Impact Cooling of the Storm-Induced SST on Hurricane Intensity     

Tong ZHU Da-Lin ZHANG 《大气科学进展》2006,23(1):14-22

The effects of storm-induced sea surface temperature （SST） cooling on hurricane intensity are investigated using a 5-day cloud-resolving simulation of Hurricane Bonnie （1998）. Two sensitivity simulations are performed in which the storm-induced cooling is either ignored or shifted close to the modeled storm track. Results show marked sensitivity of the model-simulated storm intensity to the magnitude and relative position with respect to the hurricane track. It is shown that incorporation of the storm-induced cooling, with an average value of 1.3℃, causes a 25-hPa weakening of the hurricane, which is about 20 hPa per 1℃ change in SST. Shifting the SST cooling close to the storm track generates the weakest storm, accounting for about 47% reduction in the storm intensity. It is found that the storm intensity changes are well correlated with the air-sea temperature difference. The results have important implications for the use of coupled hurricane-ocean models for numerical prediction of tropical cyclones.  相似文献   

No apparent lock-in depth of the Laschamp geomagnetic excursion: Evidence from the Malan loess   总被引：2，自引：1，他引：2  

ZHU Rixiang  LIU Qingsong    PAN Yongxin  DENG Chenglong  ZHANG Rui & WANG Xianfeng . Paleomagnetism  Geochronology Laboratory 《中国科学D辑(英文版)》2006,49(9):960-967

Developing an accurate chronological framework is always a key issue in paleoclimatic studies. Magneto- stratigraphy has been a routine tool for such purposes. However, complexities arise for inter-profile correla- tions of magnetostratigraphy due to effects of the lock-in process. One good example is the “mystery” of the mismatching of stratigraphic locations of the Matuyama/Brunhes boundary (MBB) (occurred at ~780 ka) recorded in Chinese loess and marine sedi- ments. Tauxe et al.[1] con…  相似文献   

祁连山多年冻土区天然气水合物的形成条件   总被引：9，自引：0，他引：9  

祝有海刘亚玲  张永勤 《地质通报》2006,25(1):58-63

祁连山多年冻土区面积约10×104km2,年平均地表地温为-1.5～-2.4℃,冻土层厚度为50～139m.区内侏罗纪小型含煤盆地广布,产有丰富的煤层气.南祁连盆地是一潜在的油气盆地,存在下石炭统臭牛沟组、下二叠统草地沟组、中三叠统大加连组、上三叠统尕勒得寺组4套烃源岩,具有良好的生油生气潜力.在木里煤田33号钻孔的冻土层内发现有连续逸出的高含量烃类气体,井口点燃即可燃烧,简易采气分析结果表明甲烷含量高达38.07%～75.9%.根据该钻孔的气体组分、年平均地表地温、冻土层厚度、地温梯度等数据分析,这里基本具备形成天然气水合物的温压条件,计算结果显示水合物稳定带的顶界和底界埋深分别为171 m和574m,稳定带厚度为403m.  相似文献   

天坑释义   总被引：2，自引：1，他引：2  

朱学稳  Tony WALTHAM 《中国岩溶》2006,25(Z1):35-42

天坑是一种特大型塌陷漏斗,它的演化包括大型洞穴厅堂的洞顶崩塌和大型暗河对大量崩塌块石的搬运.天坑这个术语,首先在中国使用,随后成为世界性的喀斯特词汇.  相似文献