新疆乌什、阿合奇台地倾斜异常图像与中强地震

统计分析了1988-1998年期间乌什台和阿合奇台地倾斜记录到的异常图像,发现其与周围250km范围尤其是柯坪块体上发生的4级以上地震有较好的对应关系。异常图像特征以葫芦串、错动、抖动等为主,异常持续时间为1—74天,主要集中在震前3天。最后对异常图像形成的可能机制作了初步的讨论。     

新疆新源台固体潮潮汐因子特征浅析

采用Venedikov调和分析方法对新源台倾斜固体潮整点观测数据进行处理，得到倾斜固体潮鸩波潮汐因子变化曲线。分析其震兆异常特征，给出了新源台倾斜固体潮潮汐因子异常标准，结果发现异常与周围200km范围内的5级以上地震对应较好，具有较高的预报效能并通过了尺值评分检验。     

Study on Ground Motion Attenuation Relation in Shanghai and Its Adjacent Region

Based on intensity data in Shanghai and its adjacent region, the intensity attenuation relation is determined. Selecting the western United States as a reference area where there are rich strong ground motion records and intensity data, and by determining ground motion attenuation relation in an area lacking in strong ground motion data, we obtain the ground motion attenuation relation in Shanghai and its adjacent region.     

Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct

Environmental vibrations from recent high-speed trains are becoming a special concern in the civil and environmental engineering field since they can give detrimental effects to residents, sensitive equipments and high-tech production facilities in the vicinity of train tacks. Herein, aiming at the vibration mitigation for a specific high-tech industrial area, the low-frequency vibrations from a train viaduct are targeted over an anticipated range. A theoretically designed innovative countermeasure, called honeycomb wave impeding barrier (WIB) for a wave impeding barrier, is introduced and its effects are investigated by computer simulation. The present WIB is based on the wave dispersion phenomenon that can modulate the incoming wavelengths into the shorter wavelengths, creating an apparent wave cut-off characteristic in the wave field across WIB installation area. The shorter wavelengths are further impeded due to the impedance ratio of the WIB walls and in-fill materials and absorbed by the in-fills more. The three-dimensional FEM simulation demonstrates a dramatic reduction effect that is difficult to achieve by conventional measures.     

Analysis of parameters of ground vibration produced from bench blasting at a limestone quarry

The aim of this study is to predict peak particle velocity level at a limestone quarry located in Istanbul, Turkey. The ground vibration components were measured for 73 blast events during the bench blast optimization studies during a long period. In blasting operations; ANFO (blasting agent), gelatine dynamite (priming) and NONEL detonators (firing) were used as explosives at this site. Parameters of scaled distance (charge quantity per delay and the distance between the source and the station) were recorded carefully and the ground vibration components were measured by means of vibration monitors for every event. Then, the data pairs of scaled distance and particle velocity were analyzed. The equation of scaled distance extensively used in the literature was taken into consideration for the prediction of peak particle velocity. At the end of statistical evaluations, an empirical relationship with good correlation was established between peak particle velocity and scale distance for this site. The established relationship and the results of the study are presented.     

地震荷载下莫高窟围岩动态损伤特性研究

本以敦煌莫高窟为研究对象，阐述了地震荷载下洞窟围岩动态损伤的影响因素；采用动力有限元法。从地震动特性入手。分析研究了地震作用对洞窟围岩及其附属构筑物可能造成的损坏，为石窟物地震安全评估及防灾对策研究提供了依据。     

河北省地倾斜观测资料干扰因素分析

在分析研究地倾斜观测资料时,为反映观测曲线的真实变化,需要剔除干扰因素的影响。该文通过整理分析河北省水平摆、垂直摆、水管仪等地倾斜观测资料,将河北省地倾斜干扰因素主要分为观测系统类干扰、观测环境类干扰以及气象因素类干扰。其干扰形态主要表现为变化趋势转折、变化速率改变、固体潮畸变、台阶、毛刺和突跳变化。     

用改进的经验格林函数方法模拟唐山地震动

建筑物的抗震设防需要尽可能地掌握未来大地震强震动记录信息,但大地震强震动记录的匮乏阻碍了抗震设防实践的发展。经验格林函数方法作为模拟地震动的主要方法,可以提供可靠的大地震强震动记录,但也存在着许多问题,如缺乏对大地震断层滑动分布不均匀的描述、用经验确定小震数目、模拟方法受到大小地震相似条件的限制等。文中对上述经验格林函数方法存在的问题进行了研究,改进的经验格林函数方法,有效地解决了上述问题。并用其对唐山大地震进行了模拟,并把模拟的地震动时程和反应谱与实际记录相比较,发现用改进方法模拟的地震动加速度反应谱比用未改进方法模拟结果更接近实际的地震动记录加速度反应谱。由此说明改进的经验格林函数可更准确的模拟地震动。     

基于ShakeMap_CNST的2017年精河6.6级地震灾害快速评估

基于考虑区域地震动衰减关系、场地效应及震中破裂等多因素的烈度快速评估模型,结合震害预测方法,研发了一套震害预测系统,并以2017年8月9日精河M_S6.6地震的震害预测为例,将对其的预测结果与当前主流系统进行对比。结果表明,采用ShakeMap_CNST系统能对地震的影响范围和烈度进行更为准确的估计,在人员伤亡、受灾人口估计、紧急安置人数及经济损失评估等方面,相对于其他系统,本系统的结果与现场调查的结果更为接近。     

A procedure for simulating synthetic accelerograms compatible with correlated and conditional probabilistic response spectra

The modeling of seismic load is a major topic that has to be addressed thoroughly in the framework of performance based seismic analysis and design. In this paper, a simple procedure for simulating artificial earthquake accelerograms matching the statistical distribution of response spectra, as given by median ground motion prediction equations, the standard deviation and correlation coefficients, is proposed. The approach follows the general ideas of the (natural) ground motion selection algorithms proposed by Baker [4] and Wang [43] but using simulated (artificial) “spectrum-compatible” accelerograms. This allows to simulate spectrum-compatible accelerograms featuring variability similar to the one of recorded accelerograms when the match of median and ±1 standard-deviation response spectra is imposed by the regulator. The procedure is illustrated by an application to the NGA ground motion data and models.