印度地震技术学会情况简介

印度地震技术学会(Indian Society ofEarthquake Technology)是根据1962年11月在鲁尔基举行的印度第2届地震工程学术讨论会闭幕会上通过的一项决议而成立的,因为与会的工程师和科学家都真诚希望能有一个共同的讲坛,以促进印度地震技术事业的发展。该学会总部设在鲁尔基。学会的宗旨是推动地震技术领域的研究、发展和让社会了解地震技术的工作。25年来,该学会的会员已稳定地发展到430名个人会员和40个团体会员。除了这些会员     

中国地震学会通知

原定于2009年9月下旬在新疆召开的中国地震学会成立30周年学术研讨会因故改在黑龙江省伊春市，时间不变。     

中国地震学会成立

【本刊讯】中国地震学会于1979年11月22日在大连成立。中国著名的地球物理学家顾功叙当选为学会理事长。参加大会的有各省、市、自治区及有关部门协商推荐的理事候选人和会员代表,有兄     

日本地震学会概况

日本地震学会已成立一百周年。1981年日本地震学界的一些著名地震学家撰文进行纪念。现将日本地震学会的概况简介如下。     

中国地震学会地震电磁学专业委员会换届暨学术研讨会会议纪要

在中国地震局监测预报司的大力支持和中国地震学会的关怀下，中国地震学会地震电磁学专业委员会换届暨学术研讨会于2004年4月17-23日在福建省邵武市召开，大会主题为“地震电磁学新思路、新方法和新技术”。本次会议由中国地震学会地震电磁学专业委员会主办，福建省地震局协办，并得到了挂靠单位中国地震局地震预测研究所(原中国地震局分析预报中心)的积极协助。     

新疆地震学会第二届理事会成立

１９９８年５～６月,新疆地震学会开展了换届选举工作。新疆地震学会办公室对新疆地震学会的全体会员进行了重新登记注册,有１４０名会员保留会籍。针对会员分布全疆各地的具体情况,采用了通讯选举和现场投票选举相结合的方式,经会员选举产生了新疆地震学会第二届理事会理事２２名,常务理事７名,理事长朱令人,副理事长王海涛、罗福忠,秘书长韩月鹏。经新疆维吾尔自治区科技协作委员会发字（１９９８）３９号文批复同意,新疆地震学会于１９９８年６月１８日召开了第二次会员大会,大会讨论并通过了第一届理事会的工作报告、新疆地震…     

中国地震学会地震工程专业委员会成立

中国地震学会地震工程专业委员会成立大会于1981年3月23日至27日在南京举行。这次会议是由中国地震学会召开的,学会秘书长苏公望主持了会议。国家地震局副局长、中国地震学会副理事长卫一清出席会议并讲了话,中国科学院工程力学研究所所长、中国地震学会副理事长刘恢先作了会议总结。参加会议的有国内     

中国地震学会将建立新的会员登记号制度

中国地震学会将建立新的会员登记号制度。按照中国科学技术协会的要求 ,中国科学技术协会所属 1 87个全国性学会都将统一建立新的会员登记号制度。为了营造尊重知识、尊重人才、尊重科学的社会氛围 ,加强对全国性学会会员的管理及进一步发挥全国性学会会员的作用 ,中国科学技术协会所属 1 87个全国性学会约2 0 0 0万会员都将统一建立新的会员登记号。新的会员登记号由 1 1位编码组成。前3位编码为全国性学会在中国科学技术协会的编码 ,中间 7位编码为个人会员在全国性学会的登记号 ,最后 1位编码表示该会员在多元结构的会员制度中属于哪一类…     

中国地震学会历史地震专业委员会成立

经中国地震学会批准,中国地震学会历史地震专业委员会于1987年11月3日在昆明成立。历史地震专业委员会委员共32人,其中,闵子群任主任委员,晏凤桐、时振梁、李裕彻任副主任委员。专业委员会挂靠云南省地震局。 来自全国各地的专业委员及代表共50人出席了成立大会。中国地震学会理事长陈运泰发来贺电。云南省人民政府参事室、中国地理学会历史地理专业委员会、中国地震历     

中国地震学会办公室通知

《中国地震学会会讯》第26期(仿皮面、含2006年3月~2007年2月月历)将同2006年第2期《国际地震动态》一并于2006年2月底前寄送到每一位会员手中。特此通知。中国地震学会办公室通知$中国地震学会办公室     

Quantitative relationship between pollen and vegetation in northern China

205 surface pollen samples from different communities in Northern China were analyzed to understand the quantitative relationship between pollen and its original vegetation. Pollen analysis and vegetation investigation show that the pollen assemblages differ a lot in different vegetation regions. Arboreal pollen account for more than 30% in temperate broad-deciduous forests region. In temperate steppe regions, herb pollen percentages are more than 90%, where Artemisia and Chenopodiaceae are domi- nant pollen types with Artemisia percentages more than 30%. In temperate desert, Chenopodiaceae pollen percentages are more than Artemisia, where ferns are rare. Cyperaceae pollen percentages are more than 20% in sub-alpine or cold meadows. The relations between pollen percentages and vegeta- tion cover indicate that most arboreal pollen shows a close relationship with parent plant covers, most shrubby pollen types have more or less correlations, but most herbs do not show clear correlations. For arboreal pollen types, Picea pollen shows the closest correlation with spruce trees coverage, then is Quercus and Carpinus. Betula, Larix and Juglans have also high correlation coefficients with their plants coverage, but Betula pollen is of overrepresented pollen type and more than 40% in birch forest, while Larix and Juglans pollen is underrepresented and pollen percentages are more than 10% in Larix or Juglans pure forests. Pinus is of overrepresented pollen type, and pollen percentages have some relations with plants cover. Pine forest might present when Pinus pollen percentages are more than 30%. The relations between Ulmus and Populus pollen percentages and vegetation cover are not close, where they are mixed with other arbors, they cannot be recorded easily, but if their pollen percentages are more than 1%, Ulmus or Populus trees should exist. For shrubby pollen types, the correlation be- tween Vitex pollen percentages and vegetation cover is the highest, then is Corylus, Tamariaceae and Nitraria, and their pollen percentages are less than 1% where original plant are absent. Caragana and Spiraea pollen percentages have some relations with vegetation cover. The relations between pollen percentages and vegetation cover are not clear for Rosaceae and Saxifragaceae. For herb pollen types, Cyperaceae pollen has the closest correlation with vegetation cover, where pollen percentages are more than 20% when Cyperaceae are constructive or dominant species in vegetation, and pollen per- centages are less than 5% where Cyperaceae are not constructive or dominant species (cover less than 30%). Artemisia and Chenopodiaceae pollen percentages mainly have close relations with ecological regions. The relations between pollen percentages and cover are not clear for Gramineae, Legumi- nosae and Compositae.     

新疆数字地震前兆台网运行管理中的问题分析

随着科学技术的不断发展,我国地震前兆观测技术由模拟记录到数字记录转变的实现,地震前兆数字化观测技术日趋成熟、稳定,地震前兆数字化观测普及程度越来越大,产出的数字化观测资料己得到越来越广泛的应用,数字化地震前兆台网的效益亦愈发明显,但也不可避免地存在着技术和管理方面的一些问题。通过介绍新疆数字地震前兆台网中心的运行管理,分析数字地震前兆台网中心的运行管理中出现的一些问题和几点思考。     

华北地区中小地震重新定位和地震活动特征研究

选取了华北地区1978—2011年289个台站记录到的24753个地震事件, 使用双差定位方法对这些地震进行了重定位, 获得了20512个地震的重定位结果, 平均定位误差在EW、 NS、 UD方向分别为0.54 km, 0.57 km和0.57 km。 相比于初始结果和绝对定位结果, 双差定位结果在平面上分布更集中, 沿断裂分布特征更加明显, 震源深度也更加合理。 通过剖面分析, 张北地震带、 唐山地震带、 邢台地震带均为高倾角断裂, 南部剖面6震源深度分布有随时间变浅的趋势。 通过与前人的研究结果进行对比, 本次研究使用的时间较长, 地震数量较大, 得到了更加可信的结果。     

四川地区4级以上调制小震与5级以上中强地震的关系探讨

通过对四川地区1972年以来的地震目录进行挑选和分析,得到四川地区4级以上调制小震与5级以上中强地震的对应数据结果。在所发生的41组调制小震中只有14组对应发生了中强地震,这说明在四川地区调制小震与中强地震的对应关系不是太好。但是,调制小震与中强地震的发震地点间的距离对应相关却比较好,平均距离间隔为93．49千米;所对应的调制小震与中强地震的发震时间的时间间隔平均为17．5个月。     

震级与地震破裂参数统计关系式系数的讨论

在收集６种类型震级与地震破裂参量的统计关系式的基础上，系统分析和总结了各类统计式的系数ａｉ和ｂｉ的变化范围以及二者的关系。发现ａｉ和ｂｉ之间均有或强或弱的负相关性；不同类型统计式的系数有一定的变化范围，且稳定性和收敛度不同。一般来说，涉及的破裂参量越多系数越稳定。最后依据位错公式，解释了ａｉ和ｂｉ的关系     

Width variations control the development of grain structuring in steep step-pool dominated streams: insight from flume experiments

We report results from flume experiments designed to study the effect of width variations on the formation and stability of steps in steep streams. To physically model channel width changes we inserted multiple trapezoidal elements in the flume. Two competing effects are in play: a fluidic effect, suggesting that steps are more likely to form in wide areas because of deposition enhanced by lower shear stress, and a granular effect, suggesting that steps are more likely to form in narrow areas because of particle jamming. Our experiments show that width variations enhance the formation of steps. Although steps can form in every location, those in narrow/narrowing areas are more common, more stable and they occupy a larger portion of the channel width. These results stress the importance of particle interactions in coarse-bedded streams and help river engineers by providing a new element to consider when designing step-pool sequences in river restoration projects. © 2020 John Wiley & Sons, Ltd.     

山西数字遥测地震台网地震编目及数据管理系统

介绍了山西数字遥测地震台网地震编目及数据管理软件开发的技术要点，分析了山西数字遥测地震台网系统集成后的资料产出问题，提出了解决的方案，指出该系统应朝着适用性、易用性、开放性的方向发展。     

地震信息的失真现象分析

随着信息在社会发展中扮演着越来越重要的角色,地震信息对社会的影响也越来越明显。本文着重分析了地震信息失真传播的成因、特点以及对策,为管理地震信息提供借鉴。     

成都市遥测地震台网通讯方式现状与思考

随着各种数据传输技术的不断成熟和发展,越来越多的数据传输方式在地震监测中得到了广泛应用。本文简要介绍了在地震监测台网中得到实际应用的几种数据传输方式的技术特点和组网方式。同时,将超短波传输、CDMA传输、DDN传输在成都市遥测地震台网中的实际运行情况及传输性能进行比较。     

Hydrologic procedures of storm event watershed models: a comprehensive review and comparison

Currently, many watershed models are available that have various complexities, strengths, and weaknesses. The basic mathematical foundations of these mathematical models are often overlooked due to high demands on convenient applications with graphical user interfaces. Although this and other factors are important while selecting a model, the mathematical foundation should also be taken into account, as performance or efficiency and accuracy of a model depend on its simplicity or complexity. A comprehensive review of 14 storm event watershed models was conducted. Hydrologic procedures (rainfall excess, flow routing, and subsurface flow) of the models are presented and compiled. Among the procedures, flow routing has the most influence on model performances (speed and accuracy). Overland and channel flow routing procedures using different flow‐governing equations, having various approximations and solved by different methods, are compared based on their relative levels of physical bases, complexities, and expected accuracies in simulating the dynamics of water flow. Models using more mathematical terms in the flow‐governing equations are more physically based and expected to be more accurate than models using approximations, however, are more complex due to more intensive but approximate numerical schemes (inefficient). Models using approximate equations with analytical solutions may provide a balance between complexity and accuracy. The review and comparisons are useful to modellers, water resources managers, and researchers in understanding the basic foundations of the models and making informed selections for practical applications or further developments. Other factors such as data intensiveness, user friendliness, and resource requirements are also important considerations. Copyright © 2011 John Wiley & Sons, Ltd.