沈阳满堂4.3级地震的烈度及地震地质背景     

钟以章  喻虹桥  石盛昌 《东北地震研究》2003,19(2):1-7

2003年3月30日在沈阳市郊满堂乡发生了ML4．3级地震，本文讨论了这次地震的烈度并对震区的地震地质条件作了初步分析。  相似文献   

Quantitative measurements on the paleo-weathering intensity of the loess-soil sequences and implication on paleomonsoon   总被引：2，自引：0，他引：2  

郝青振  郭正堂 《中国科学D辑(英文版)》2001,44(6):566-576

The loess-soil sequences in northern China provide a near continuous record of Quaternary paleoclimate. The pedogenetic intensity of the sequences is closely linked with the variations of the East Asian summer monsoon. In this study, 2181 samples from the Changwu and Xifeng loess sections are analyzed and two high-resolution paleo-weathering timeseries of the last 1.2 Ma are generated, using the ratio of CBD extractable free Fe₂O₃ (FeD) versus the total iron (FeT). This new index is compared with micromorphological features, low-frequency magnetic susceptibility, frequency-dependent magnetic susceptibility, and the Rb/Sr ratio^[5,6]. The results suggest that the FeD/FeT ratio is able to better reflect the degree of soil development. Since the chemical weathering of loess in the Loess Plateau region mainly depends upon the summer precipitation and temperature under modern climate condition, which are closely associated with strength of summer monsoon, and the chemical weathering intensity of loess primarily reflects the variations of the summer monsoon circulation.  相似文献   

1987年9月19日富蕴北5.8级地震     

郭恒祖  杨马陵 《内陆地震》1988,(4)

1987年6月19日新疆富蕴县可可托海镇西北发生了Ms=5.8级地震,震中位于喀依尔提河与阿拉散河交汇处,震中烈度为Ⅶ度,等震线长轴方向与可可托海——二台断裂基本一致。震中区人员无伤亡,仅有山石滚落;Ⅵ、Ⅴ度区内的土平房、有不同程度的损坏个别砖平房,楼房出现裂缝。这次地震属于孤立型地震,震前有中短期异常。  相似文献   

关于地震烈度的讨论--以新疆地区为例   总被引：2，自引：0，他引：2  

柔洁  伊力亚尔·阿不力孜  陈建波 《中国地震》2006,22(1):94-102

地震烈度是衡量某一次地震对一定区域地面影响的强烈程度，代表的是一定范围内地震动强度的平均度量，反映的是地震中人的感觉和地震对地面建筑物所产生影响的分布图象。1980年初编制的《中国地震烈度表》（中国科学院工程力学研究所，1980），逐项描述了各烈度影响下人的感觉及震害现象与震害指数的对应关系。到目前为止，地震烈度的震害标准没有改变，究其原因：这种以人的感觉和宏观、微观地震震害现象为指标的烈度评定，简单易行，便于掌握；同时地震烈度的内在含义已被许多行业以及公众所接受和理解。从第一代地震烈度区划图到第三代区划图表示的不同等值线范围在很大程度上（尤其是经济欠发达、人口分布稀疏、自然环境条件相对恶劣的区域）都是依据地震烈度等值线分布状况而确定的；地震烈度仍然是抗震救灾与大中型城市抗震设防和规划的重要科学依据和指标。  相似文献   

A Discussion on Seismic Intensity——Taking the Xinjiang Area As an Example     

Rou Jie 《中国地震研究》2006,20(3):351-360

The intensity of an earthquake is an important criterion and index for earthquake resistance, and disaster relief and for antiseismic engineering in large and medium sized cities. The earthquake data in Xinjiang are abundant and have been widely applied to the statistic relationship of seismic intensity of western China. However, there exists some unreasonable and man_made factors in them. We put forward the idea of area A_ 0-1 to express the effect of seismic intensity, studied the questions and influencing factors arising from uncertainty of intensity zoning and finally, proposed some solutions.  相似文献   

Energy approach for earthquake induced slope failure evaluation     

T. Kokusho  T. Ishizawa 《Soil Dynamics and Earthquake Engineering》2006,26(2-4):221-230

Earthquake-induced slope stability is evaluated by the force-equilibrium method in engineering practice. This method provides a safety factor against initiating failure or displacement according to the Newmark model along a fixed slip surface but it cannot evaluate failure deformations after failure occurs. An energy approach is proposed as an alternative means for evaluating slope failures and subsequent flow deformations. The driving energy for slope displacement is considered to be the earthquake energy and the gravitational potential energy. As a first step in the research, an energy balance is formulated for the model of a rigid block resting on an inclined plane. Then, an innovative model test is developed, in which the energy balance in a sliding slope is measured on a shake table. The earthquake energy used for the slope failure can be successfully quantified in the test and its contribution to displacement is discussed in the light of the energy balance established for the block model.  相似文献   

1999年山西应县—浑源4.6级地震宏观烈度考察报告     

刘忠佩 《山西地震》2000,(3)

在对 1999年 5月 15日山西省应县—浑源 ML4.6地震宏观烈度考察的基础上 ,得出极震区烈度为 度 ,呈椭圆形 ,长轴走向北东 ,长度 13km,短轴 10 km,面积 10 2 km2的结论。分析了地震的发震构造 ,认为北东向的恒山北麓断裂是控制大同盆地的南部边界断裂 ,为控震构造 ,北西向的次级活动断层为此次地震的发震构造。指出 ,该次地震破坏较重的原因是由于震源浅  相似文献   

Turbulence Characteristics In The Surface Boundary Layer Over The South American Pampa     

Osvaldo L. L. Moraes 《Boundary-Layer Meteorology》2000,96(3):317-335

This paper presents results of turbulence measurementsmade in the south of Brazil in the Pampa region.Data collected at 1Hz are used to calculatestandard deviations of temperature and velocities. Onthe other hand data collected at 10Hz areused to study the behaviour of spectra and cospectraof turbulence in the surface layer. Dimensionless dissipation rates of turbulent kinetic energy and temperature variance are also presented. The frameworkof Monin–Obukhov Similarity theory is used and allresults are compared with other experimentalstudies.  相似文献   

Intensity-based seismic risk assessment   总被引：1，自引：0，他引：1  

R. M. W. Musson   《Soil Dynamics and Earthquake Engineering》2000,20(5-8):353-360

  相似文献   

Shaking table test of failure of a shallow foundation subjected to an eccentric load   总被引：3，自引：0，他引：3  

M. Maugeri  G. Musumeci  D. Novit  C. A. Taylor 《Soil Dynamics and Earthquake Engineering》2000,20(5-8):435-444

  相似文献