地震地面运动被模拟成随机过程。
Earthquake ground motions are modeled as stochastic processes.
地震仪是提供地面运动的连续记录。
A seismograph is an instrument which gives a continuous record of the motion of the ground.
在纯粹地震学中，地面运动一般以振幅表示。
In pure seismology, the ground motion is generally expressed by its amplitude.
本文着重考虑了土层的特性对地面运动的影响。
But in this paper, we lay emphasis only upon analyzing the influence of soil layer characteristics on ground motion.
人工地面运动时程是工程抗震研究的重要工具。
Artificially generated ground motion history is an important tool for earthquake engineering research.
天基稀疏阵实现地面运动目标指示具有很大吸引力。
Ground moving target indicator (GMTI) using space based sparse array is attractive.
对地面运动体，输入速度通常由测速计的驱动系统来供给。
On a land vehicle the speed input is usually obtained from the speedometer drive system.
居住在地震多发地区的人们应该建造能够抵抗地面运动的房屋。
People who live in the areas where earthquakes are a common occurrence should build houses that are resistant to ground movement.
数值结果表明，地下洞室群对附近地面运动具有显著的放大作用。
It is shown that underground group cavities significantly amplify the surface ground motion nearby.
利用该建模方法，给出了地面运动目标轨迹的灰色自适应预测模型。
With the modeling method, the paper gives the gray self -adaptive forecast model of the ground mobile target.
埋藏基岩凹陷地形的地震地面运动反应与震害异常带有成因上的联系。
There is a genetic relationship between the underlying bedrock depression and earthquake ground motion responses.
分析了地面运动目标跟踪的典型场景，采用逻辑推理方法进行目标跟踪。
Typical moving ground target tracking scenario is analyzed and logic inference is introduced for target tracking.
本文对利用经验格林函数法合成断层附近的强地面运动等问题做了初步研究。
In this paper, some studies are made for synthesizing strong ground motions near fault by using empirical Greens function.
首先研究了SDOF系统参数和地面运动参数对弹性地震输入能量谱的影响。
The influence parameters, including the parameters of the SDOF systems and the ground motions, on the input energy spectrum are investigated.
研究结果还表明用地面运动峰值参数估算地震应力降是一种新的实用性较强的方法。
The results of this study also show that estimation of seismic stress drop from the peak parameters of ground motion will become a new practical method.
地震地面运动的空间变化效应(特别是行波效应)对大跨度结构的响应有很大影响。
The spatially varying effects of the ground motions especially the traveling wave effect, have great influences on the dynamic responses of long-span structures.
由于这种方法能较好地反映地面运动的时域非平稳性，所以得到的计算结果更真实。
The results may better reflect the non-stationarity of ground motion in time domain and are closer to reality than those by wave theory and stationary random vibration theory.
记录地面运动的全波场，对地震学、地震勘探学以及地震模型试验都有重要的意义。
It is a great significant for surveying the full fields seismic movement in seismology and seismic prospecting as well as model seismology.
最后从杂波自由度得到分布式小卫星雷达实现地面运动目标指示的基本设计约束条件。
Basic design constraints of the distributed small satellite based GMTI radar are derived from the clutter rank.
地面运动加速度功率谱模型为零均值的平稳高斯过程，描述为过滤白噪声施加于支撑各点。
The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.
引入非线性动力学理论和混沌时间序列分析方法考察强震地面运动加速度时程的非线性特征。
The nonlinear dynamic theory and the chaotic time series analysis method were adopted to examine the nonlinear characteristics of strong earthquake ground motions in this paper.
研究了在质量偏心和双向地面运动情况下结构从弹性、开裂、屈服直至破坏等各阶段的地震反应。
The dynamic responses of the models with mass eccentricity and under the condition of bi-directional ground motion were studied at the elastic stage and stages of cracking, yielding and failure.
计算结果与均匀半空间自由场做了对比，以说明竖向地裂缝对地震波传播和附近地面运动的影响。
Compared with the seismic responses of free homogeneous half space, the results present the effect of vertical cracks on the propagation of seismic wave and the ground motion near the fault site.
因此采用能反映时频非平稳特性的时变谱密度(即局部谱密度)来描述地震地面运动是非常必要的。
Consequently, it is necessary to describe earthquake ground motion with local spectral density, which is time-dependent and can reflect the non-stationary characteristics.
第四章详细介绍了强地面运动观测系统各子系统的设计与实现，并阐述了其核心软件的实现与升级。
Chapter four: design and realization of the system of strong ground movement observation and its core software are introduced.
第四章详细介绍了强地面运动观测系统各子系统的设计与实现，并阐述了其核心软件的实现与升级。
Chapter four: design and realization of the system of strong ground movement observation and its core software are introduced.
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