Correlation between the seismicity parameters

Though the forecast and prediction of earthquakes is a commonly accepted difficult problem in science, the step towards the exploration and knowledge of the generation and occurrence of earthquakes has never stopped. It has strong scientific exploration nature and great social efficacy in disaster reduction. For this reason, it has always been the object and motivation pursued assiduously by earthquake researchers. It is beyond doubt that the study of seismicity is still one of the important information sources that have historical records of the longest time and most abundant earthquake cases that can be testified. For many years, with the progress of study in this aspect and the unceasing increase of study methods, there have been not less than tens of methods that can be used to describe theseismicity characteristics from different angles. It is of great importance to determine from the numerous methods those ones that are relatively independent and to understand how many dimensions are there to restrict the complexsystem of earthquake generation and occurrence. Taking these as a referential basis, we would be able to identify the quantities that restrict the study of the seismogenic system, to raise the scientific value and rigorousness of prediction and forecast, and to get rid of the trouble of repeated information superposition.     

GPS导航仪在测绘工程中的应用

通过以GARMIN GPS导航仪为例，介绍了导航仪的主要功能特点、参数设置等，并对其在测绘工程中的应用进行了探讨。     

Adaptive bang–bang control for the vibration control of structures under earthquakes

An adaptive method based on the modified bang–bang control algorithm is proposed for the vibration control of structures subjected to unexpected severe seismic loads greater than the design loads. A hydraulic‐type active mass damper was made and experiments were carried out in the laboratory using a one‐story test structure and a five‐story test structure with the active mass damper. Through numerical simulations and experiments it was confirmed that the proposed method works well to suppress the vibration of structures subjected to unexpected severe seismic loads greater than the design loads without causing any unstable situations. Copyright © 2003 John Wiley & Sons, Ltd.     

支撑刚度对磁摩擦耗能减振体系的影响

本文在已有磁摩擦耗能减振体系振动台试验基础上，讨论了两类磁摩擦耗能减振体系支撑刚度的影响，揭示了支撑刚度对磁摩擦耗能装置减振效果的影响规律，给出了两类磁摩擦耗能装置在结构中发挥最佳减振效果时支撑刚度的取值范围。     

一种新型软钢阻尼器力学性能和减震效果的研究

本文研究了一种新型软钢阻尼器。首先分析了这种阻尼器的力学性能和减震机理，依据试验结果给出了它的恢复力模型，并推导得出了特征参数的表达式和疲劳验算式；研究了阻尼器参数对减震效果的影响，给出了最佳的参数取值范围；算例分析表明该种阻尼器具有很好的减震效果。     

地震活动性参数分类及其相关性初步研究

从各地震活动性参数的原始定义及其计算过程所反映出的物理本质出发，并为研究不同参数间相关性方便，将已有的30多种地震活动性参数分为五类：频度类、能量类、分布类、综合类和非线性类。在过去工作的基础上，进一步研究了同一类别中各参数间的相关性，取得了一些初步看法。     

铅芯橡胶支座基础隔震体系参数优化配置研究

探讨了铅芯橡胶支座胶支座（LRB）用于基础隔震体系时参数的优化配置问题，对一算例采用非线性时程分析法研究了不同地震波激励下的地震反应。结果表明，对于具体工程控震指标要求，可以通过优选LRB参数来实现。     

2001年7月11日甘肃省肃南县祁青5.3级地震的基本特征

2001年7月11日在甘意省意南县祁青乡发生了Ms5．3地震，经震后现场考察，总结了这次地震的基本参数、烈度与震害、发震构造等基本特征。     

琼北全新世火山区火山系统的划分与锥体结构参数研究

根据琼北全新世火山区内火山作用产物的成因类型与喷发物理过程的野外考察结果 ,结合航片解译资料 ,确定了该区火山作用的发育特征、形成期次与规模 ,并以此作为进一步评价火山灾害的基础 ;根据锥体形成后物理降解作用与时间的关系 ,讨论了琼北全新世火山区众多锥体结构参数之间的关系。研究结果为 :琼北全新世火山区分为 4个火山系统 ,即西北部的马鞍岭台地火山系统、东南部的雷虎岭盾片状火山系统、夹于二者之间的浩昌单成因火山系统和NW向裂隙式喷发系统。工作区内琼北新生代火山共计 5 9个 ,火山结构类型可分为火山锥、熔岩穹、熔岩湖与低平火山口等。在火山锥中 ,依据锥体组成与结构的差异又可进一步分为岩渣锥、溅落锥和混合锥等碎屑锥。琼北近代火山锥体高度多 <4 0m ,绝大多数锥体的底部直径 <5 0 0m。锥体底部直径和火口坑深度之间具有明显的正相关关系。由锥体底部直径与火口缘直径的差值与锥体高度投点图可以明显地区分出早期的低平火山口和晚期的不同类型锥体     

2003年2月24日新疆巴楚-伽师6.8级地震

2003年2月24日10日03分，新疆伽师县境内发生6．8级地震，极震区烈度Ⅸ度，对邻近的巴楚县琼库尔恰克等乡镇造成严重毁坏和伤亡。地震造成灾害损失近14亿人民币。文章对此次地震的基本参数、震源机制、地震序列、震害损失评估及地震应急工作等作了概述。