| 1. | At greater epicentral distances the rayleigh waves become very prominent .
当离震中距离更大时，瑞雪波才变得显著。 |
| 2. | Determine the scope of the [ impending ] earthquake . how large will the epicentral area be
确定即将来临的地震的范围。震中区有多大？ |
| 3. | This year focused on responsive action to be taken in the case of an epicentral earthquake in the capital
今年的重点在于震中位于首都的地震发生时的反应行动。 |
| 4. | Basic characteristics of current strain field in the epicentral area of xingtai , bohai , haicheng and tangshan strong earthquake
海城和唐山大地震震中区现今应变场的基本特征 |
| 5. | It is apparent that in general li ' s mind that ( 1 ) the large earthquake would surely occur ( “ how large will the epicentral area be ? ”
显然，在李将军的头脑中， ( 1 )一个强震肯定将发生“震中区有多大？ ” |
| 6. | The reservoir - induced earthquake magnitude is usually ! low but its epicentral intensity is high and is nearby important equipments . so it can destroy seriously project and induce secondary disasters
由于水库诱发地震震中都紧邻重要水利工程设施，且震源浅，震中烈度高，所以虽然震级大部分不高仍然可造成大的破坏。 |
| 7. | This is an important document , because the serious damages reported in it , such as collapse of gables and chimneys , may in part explain why some communes , brigades , and individuals in the epicentral area made their own evacuation decisions without explicit instructions from higher levels
这是一项重要的文件，因为它对一些严重的破坏进行了报告，如山墙和烟筒倒塌，可能部分解释为什么震中地区的一些公社、大队、个人自己做出了撤离的决定，没有等待向更高层请示就这样做。 |
| 8. | Four records with different earthquake magnitude , epicentral distance and spectrum ingredient are selected as the seismic input . the result of it compared with the result of test and spectrum analysis . lastly , on the basis of analysis result the conclusion is drawn and the recommendation and perspectives are put forward
选取了el - centro波等四条不同震级、不同震中距及频谱成份不同的地震波作为输入波，对其进行了反应谱分析，计算结构在其作用下的动力反应，并与试验结果及反应谱分析结果进行对比。 |
| 9. | Based on some macroscopic evidences gained in actual earthquake fields and on a preliminary theoretical analysis , it has been pointed out that the rayleigh waves should be an essential cause of liquefaction for the fields beyond the epicentral region with saturated sand deposits at shallow depths
( 4 )首先介绍了提出rayleigh波是液化主因的背景，基于宏观震害资料的启示，提出了rayleigh波可能是造成砂土液化的主要动因的新见解。并用单相介质模型的总应力法，分析了rayleigh波可能产生的应力大小。 |
| 10. | In addition , effects of several factors such as local site conditions , focal mechanism , epicentral distance and seismic magnitude on these parameters are discussed , and several significative results and conclusions are obtained . in all records there are about 1 / 3 vertical ground motion ’ s peak acceleration bigger than 2 / 3 of the corresponding horizontal one , so the action of vertical ground motion should not to be underestimated . vertical design response spectrum equals that the horizontal design response spectra times 65 % is probably unsafe when period is short , and suggest adopting different coefficients when at different periods
本文基于对大量欧洲强震记录的研究,分析了地震动竖向与水平向分量在峰值加速度、反应谱值、频谱周期等参数方面的差异,以及这些参数与场地、震源机制、震级和震中距的关系,得到了以下有意义的结果和结论:在本文分析的地震记录中大约1 / 3的记录加速度峰值比大于2 / 3 ,竖向地震动分量的作用不可低估;在短周期,竖向地震动影响系数的最大值仅取为水平向地震动影响系数最大值的65 %是偏于不安全的,可以考虑按周期分段采用不同的折减系数;我国现行抗震规范中设计反应谱特征周期的取值偏低,可能是偏于不安全的;竖向与水平向地震动分量卓越周期的比值在0 . 7 - 0 . 9之间,竖向设计反应谱的特征周期应有单独规定。 |
