In this paper,the definitions and the measurement methods of local magnitude M L ,body wave magnitude m b ,surface wave magnitude M S and moment magnitude M W are introduced and the advantagesas well as the disadvantages of these magnitude scales are analyzed.
简要介绍了地方性震级ML、体波震级mb、面波震级MS和矩震级MW的定义及其测定方法,分析了它们的优点和缺点,并对震级饱和效应及其产生的原因作了介绍和解释。
In doing so, different responses of torsional vibration of single-story structures with different dynamic characteristics are analyzed and the study shows that the influence of seismic direction should not be overlooked.
采用振型分解反应谱法计算结构在平扭耦联下的扭转振动效应 ,研究具有不同动力特征的单层结构在不同方向地震作用下扭转效应的变化 ,发现不同动力特征下地震作用方向对结构扭转效应的影响不可忽略 ,因此认为衡量建筑结构扭转振动效应时应考虑地震的作用方向 ,并对计算扭转振动效应时选用的地震作用方向提出建议。
Seismic anisotropy in the crust in northwestern capital area of China;
首都圈西北部地区地壳介质地震各向异性特征初步研究
One of the authors attended the workshop,and there based on the academic exchanges of the workshop, they introduced some new developments in seismic anisotropy research in the world from seven aspects.
第七届地震各向异性国际研讨会于１９９６年２月１９～２３日在美国佛罗里达州迈阿密市举行。
However,expressions of the group velocities in terms of ray angle are needed in calculating travel times for anisotropic media and in analysis of seismic anisotropy.
地震各向异性介质的群速度是关于相角的复杂函数,将其表示成射线角形式较为困难,这给地震各向异性分析以及走时正演模拟等带来诸多不便;另一方面,观测资料表明实际地球介质的地震各向异性通常较弱,这为用射线角近似表示地震波群速度提供了可能。
History and recent important advances about seismic anisotropy are briefly reviewed.
介绍了地震波各向异性研究的发展历史和进展,着重叙述在地球各个圈层特别是地壳和上地幔中的地震波各向异性,及其在地球动力学和地震监测中的应用。