关于成都地震台测震资料中2～4 Hz干扰频率范围的研究

通过提出3个思考,研究了2～4 Hz干扰的性质以及演变的过程,结合仪器响应以及背景噪声分析干扰产生的原因。分析结果表明:2～4 Hz干扰已成为成都地震台测震资料中的固有干扰,2011年开始出现且现今广泛存在于成都地震台5.5级及以下且震中距大于20°的远震波形、4.5级及以下的近震波形内。成都地震台的背景噪声水平于2011～2012年陡增,2012年达到峰值。干扰的演变规律与台基背景噪声变化走势有着良好的对应关系,与仪器响应并无直接的关联性。     

Modelling the annual cycle of landfast ice near Zhongshan Station,East Antarctica

A high resolution one-dimensional thermodynamic snow and ice(HIGHTSI) model was used to model the annual cycle of landfast ice mass and heat balance near Zhongshan Station, East Antarctica. The model was forced and initialized by meteorological and sea ice in situ observations from April 2015 to April 2016. HIGHTSI produced a reasonable snow and ice evolution in the validation experiments, with a negligible mean ice thickness bias of(0.003±0.06) m compared to in situ observations. To further examine the impact of different snow conditions on annual evolution of first-year ice(FYI), four sensitivity experiments with different precipitation schemes(0, half, normal, and double) were performed. The results showed that compared to the snow-free case,the insulation effect of snow cover decreased bottom freezing in the winter, leading to 15%–26% reduction of maximum ice thickness. Thick snow cover caused negative freeboard and flooding, and then snow ice formation,which contributed 12%–49% to the maximum ice thickness. In early summer, snow cover delayed the onset of ice melting for about one month, while the melting of snow cover led to the formation of superimposed ice,accounting for 5%–10% of the ice thickness. Internal ice melting was a significant contributor in summer whether snow cover existed or not, accounting for 35%–56% of the total summer ice loss. The multi-year ice(MYI)simulations suggested that when snow-covered ice persisted from FYI to the 10 th MYI, winter congelation ice percentage decreased from 80% to 44%(snow ice and superimposed ice increased), while the contribution of internal ice melting in the summer decreased from 45% to 5%(bottom ice melting dominated).     

地震台站标准化设计在冬奥会保障项目中的应用——以河北阳原台为例

台站外观及内部设计统一标准化、规范化,是标准化地震台站建设的重要组成内容,它既是提升地震台站现代管理水平的推进剂,又是提升台站监测能力的重要环节,对促进防震减灾业务信息化、现代化具有重要的现实意义。本文以阳原台标准化设计工作为例,对阳原台的观测布局、防震加固、综合布线、标识标志等内容按照要求进行标准化设计,并对台站标准化设计在台站建设中的实际应用展开讨论,探索标准化设计在冬奥会保障项目台站建设工作中的具体应用。     

都兰地震台地电场数据变化特征分析

介绍了都兰地震台地电场观测的基本情况,选取2014-2017年的观测数据,对地电场观测中遇到的干扰进行调研分析。结果表明,在日常观测中,都兰地震台地电场观测资料可以真实的反映地下介质变化,干扰源也可以通过数据不同变化形态、幅度快速进行判断,并提出相应的措施,为地震预报做好基础工作。     

银川地震台CTS-1数字地震仪震级校正初探

主要分析讨论了2002年1月~2005年2月银川台数字地震仪测定的震级与中国数字地震台网观测报告震级的误差,给出银川台CTS-1数字地震仪震级的校正值,以提高银川台地震速报的精度。同时初步探讨分析了银川台数字地震仪震级误差的原因。     

Microsoft SQL Server 2000在天津市地震前兆台网中心的应用

主要介绍了《天津市地震前兆台网管理软件》的数据库管理功能及其在前兆台网中心的重要作用,VB管理数字化前兆数据库的关键技术、HTTP方式访问数据库的方法以及地下流体月报表打印源码实例等。     

Characteristic of the vertical seismic waves associated with the 1995 Hyogo‐ken Nanbu (Kobe), Japan earthquake estimated from the failure of the Daikai Underground Station

The dynamic behaviour of underground structures built by cut‐and‐cover methods is discussed. A simple model analysis shows that a column supporting the overburden at midspan (central column) can resonate upon incidence of an elastic wave of a specific frequency. The analytical results indicate that not only the size and material properties of the column, but also the static load acting on the column (overburden) is a decisive factor that influences the resonant frequency. Based on the results obtained by the analysis, the mechanism of the failure at the Daikai Underground Station in Kobe caused by the 1995 Hyogo‐ken Nanbu, Japan, earthquake is investigated. It is shown that the wave‐induced damage to underground structures can concentrate on the sections with specific overburden, and from the induced damage, it is possible to estimate the frequency characteristics of the associated seismic waves. Copyright © 2000 John Wiley & Sons, Ltd.     

南极中山锚地与普里兹湾顶地形地貌特征

本文使用中山锚地选址测绘资料及考察记录,对中山锚地现代地形地貌特征进行了分析。基于中山站附近海湾海底地形复杂多变,水深变化大的特点,将研究区域主要分为水下岸坡、海底峡谷和台地3个大的地貌单元,且对海底冲刷沟槽、水下低丘、洼地等次一级地貌类型发育进行了分析。同时指出位居台地上的中山锚地发育有裂隙带,此裂隙带横跨台地,长约3.8km,宽约80m,可能会在特定条件下,如地震、冰崩等,形成因海底斜坡失稳而向深海滑塌的地质灾害。     

2007年7月16日日本新溻地震对柏崎刈羽核电站的影响

2007年7月16日日本新溻县柏崎市附近海域发生Mw6．6地震（日本气象局震级MJMA6．8）。该地震引发世界最大核电厂——柏崎刈羽核电站多起核安全事件，是世界范围内有记载的对核电站影响最为严重的一次地震。本文根据收集到的资料，详细介绍了该地震对柏崎刈羽核电站造成的影响，文章最后概述了日本、国际原子能机构对该地震的反思以及我们应该从中吸取的经验教训。     

南极长城站地磁台的建设

南极长城站地磁台建成于1987年3月,它包括观测室、记录室和各类探头室等。建筑材料具有无磁性、保温的特点,结构采用防雪、抗强风的高架建筑形式。建成后即开展了地磁场的常规观测,并取得了不同周期地磁变化的记录资料,这些资料目前已整理成册,供分析研究。