会昌地震台数字与模拟地震波形和震级的对比初探

通过会昌台数字与模拟地震记录到的多个地震事件进行对比分析，认为前者在记录带宽、获取更多的地震动物理量、记录波形能力及可操作性等方面具有显著的优势，数字观测完全可以取代模拟观测；对两种记录计算的地震震级进行了对比与统计分析，发现数字记录近震的震级比远震的偏差要大，远震震级可直接与全国地震目录接轨。     

地震观测技术展望

展望了将高新技术用于地震观测的前景，利用高新技术改善地震监测预报条件，扩大观测范围和增强综合分析能力，建立新型的三维观测系统，开展“空中、地表、深部”的观测研究；建立动态的数字地球模型，开辟研究地震的新领域，将使准确预报地震成为可能。     

计量用水智能监测系统的设计与实现

水位传感器与单片机智能遥测终端相配合设计的计量用水智能监测系统可以通过电话线，将计量用水信息远程数传到监控中心，并在监控中心生成各种图文、报表。通过对图文、报表的分析，实现对智能遥测终端的远程监控。该系统将在水利建设中发挥重要作用。     

基于MAPGIS数字化地形图的技术应用

以数字化四川雅安地区白铜尖子地形图为例，从数据输入、数据处理两方面入手，结合实践经验，详细阐述了运用MAPGIS数字化地形图时的一些关键技术，主要包括图件的输入、分层矢量化的输入、图形编辑、高程数据的编辑、水系编辑、坐标匹配和误差校正，供GIS领域的研究人员参考。     

数字填图技术在区域地质调查中应用实例--以民和试点图幅为例

文章根据2002年中国地调局在青海省民和幅进行区域地质调查数字填图技术试点,结合实践,详细介绍了数字填图技术在区域地质调查中从野外到至内以最终阶段成果的PRB过程,证明了区域地质调查填图数字化是切实可行的。     

CODA Q estimates for Kumaun Himalaya

CodaQ (Q _c) estimates for the Kumaun Himalaya region have been obtained in high frequency range. Local earthquakes, recorded by a digital seismic network in the region, which fall in the epicentral distances range of 10 to 80 km and with a local magnitude range of 1.4 to 2.8, have been used. The coda waves of 30 sec window length, filtered at seven frequency bands centered at 1.5, 3, 6, 9, 12, 18 and 24Hz, have been analysed using the single backscattering model. The values ofQ _c estimates vary from 65 to 283 at 1.5 Hz to 2119 to 3279 at 24.0 Hz which showed thatQ _c is frequency dependent and its value increases as frequency increases. A frequency-dependentQ _c relationship,Q _c = (92 ± 4.73)f^(1.07±.023), is obtained for the region representing the average attenuation characteristics of seismic waves for Kumaun Himalaya region.     

Flooding in the Red River Basin – Lessons from Post Flood Activities

Flood of 1997 affected a large number of residents in the Red River Basin. Life disruption, economic damage, lengthy recovery process, physical and emotional trauma motivated a number of main initiatives to improve the level of preparedness in case of future floods. This review will focus on the involvement of the International Joint Commission (IJC). Personal experience is used in this review to emphasize a number of important lessons, of special relevance to Canadian portion of the basin, from the post flood activities. Level of preparedness for, and potential damage from future floods will benefit from focusing very serious effort on the improvement of the Canadian database, exchange of data with the U.S. and standardization of data collection, exchange and use. Tools for sustainable floodplain management are improving. However, the Red River Basin with its characteristics requires a special set of sophisticated tools that will enhance flood flow forecasting, planning of new flood control measures (structural and non-structural) and emergency operations of existing flood protection system. City of Winnipeg, being the largest population centre in the basin deserves a special attention. Additional protection of 670,000 people is required that will take into consideration temporal and spatial distribution of economic and social costs and benefits.     

基于GIS的数字地图的应用

文章概述了地理信息系统的特点，分析了基于GIS的数字地图的优势及主要作用，总结了目前数字地图的使用情况和应用效果，探讨了提高数字地图使用效益的有效途经。认为，保证数字地图信息的位置精度和现势性，实现数字地图信息资源共享，扩大地图应用领域和提高地图利用率，增强使用数字地图的先进手段，构造数字地图设计制作与应用的互动平台，开展互联网地图使用情况的调查研究是今后地图应用学研究的重点。     

构建"数字湖北"的建议

讨论了如何构建“数字湖北”。针对湖北省情，建议以湖北的江湖水系作为切入点，有步骤、分阶段地建成数字湖北。并对建立数字湖北江湖水系，提出了实施相关地理数据采集的具体建议。     

基于四象限光电池的激光准直仪

介绍了一种用激光光线作为基础，用四象限光电池作为探测器的激光准直仪，该仪器结构简单、稳定性好且成本低廉，其分辨力为０.01mm，作用距离可达40m。