2023年土耳其7.8级强震前烟台台伸缩仪EW分量固体潮畸变北大核心CSCD

烟台台SS-Y伸缩仪EW分量在2023-02-06土耳其7.8级双震前2 d开始出现急速上升趋势变化,至6日凌晨开始下降,变化幅度达到9.58×10^(-8),震后维持快速上升趋势。对烟台台伸缩仪稳定性指标进行判定,认为仪器稳定;经现场核实,未发现环境干扰。最后对烟台台伸缩仪固体潮畸变特征进行分析,并基于畸变与远震前兆的关系进行初步探讨。     

2023年土耳其7.8级强震前烟台台伸缩仪EW分量固体潮畸变

烟台台SS-Y伸缩仪EW分量在2023-02-06土耳其7.8级双震前2 d开始出现急速上升趋势变化,至6日凌晨开始下降,变化幅度达到9.58×10^-8,震后维持快速上升趋势。对烟台台伸缩仪稳定性指标进行判定,认为仪器稳定;经现场核实,未发现环境干扰。最后对烟台台伸缩仪固体潮畸变特征进行分析,并基于畸变与远震前兆的关系进行初步探讨。     

易县台伸缩仪受荷载干扰的模拟数值分析

易县地震台伸缩仪曲线2019-01起加速上升,年变曲线形态出现转折变化,排查各项干扰因素并结合异常出现时间及三维模拟定量分析发现,应变模拟计算结果3.14×10－8是应变实际异常变化量6.98×10－8的一半,此次洞体应变数据异常与采石场造成的荷载环境干扰有关,但可能不仅这一干扰因素,不排除存在其他干扰源或地壳自身产生的应变变化。     

气压、温度、洞温变化对常熟台洞体倾斜、应变观测影响研究

对常熟台洞体倾斜、应变观测与气压、温度、洞温等影响因素的相关性进行研究,结果表明：1）洞温、温度日变化与水管倾斜仪、垂直摆倾斜仪、洞体应变伸缩仪相关性低较,影响比较弱;气压日变化与洞体应变伸缩仪相关性高于水管倾斜仪、垂直摆倾斜仪;水管倾斜仪、垂直摆倾斜仪、洞体应变伸缩仪与气压在各优势频段上均表现为同步负线性相关关系。2）洞温年周期变化是水管倾斜仪与垂直摆年周期变化的主要因素,相关系数高,与温度有一定相关性,与气压相关性弱;洞体应变伸缩仪年变影响机制较为复杂,与洞温、气压、温度年周期变化均有一定的相关性。     

昆仑山口西8.1级地震易县台潮汐形变图像浅析

用易县地震台潮汐形变观测资料分析了青海昆仑山口西8．1级地震时同步出现的同震阶跃的特征。可以看出，DSQ型水管仪、VS型垂直摆、TJ-2C型体应变仪的同震阶跃呈负值变化，而SS-Y型伸缩仪之EW分量和NE分量呈正值变化。     

台湾集集7.6级地震前后福建沿海地区的地壳运动

对福建GPS网的5期观测数据(1995、1997、1999、2001、2003)进行了统一处理,得到4个时段(1995~1997、1997~1999、1999~2001、2001~2003)ITRF2000的站速度、福建地区的整体旋转参数和主应变参数。福建地区存在一致的南东向运动地震前(第1时段)运动速度平均为32.1mm/a;震时和震后两年时间内(第2时段)运动速度大幅度增加到38.7mm/a;震后第2个两年(第3时段)运动速度相对于第2时段大幅度减小为30.0mm/a;震后第3个两年(第4时段),运动速率相对第3时段有较大增加并超过了第1时段。福建地区的主应变场,在震前主压应变率(12.4×10-9/a)大于主张应变率(7.1×10-9/a),地壳表现为弹性压缩,主压应变轴为N70.9°W;震后应变场发生了相反的变化,主压应变轴变成了主张应变轴,主张应变率(28.9×10-9/a)大大超过主压应变率(3.7×10-9/a),地壳表现为南东方向弹性伸展,第3时段与第4时段主压应变率逐渐增加,主压应变轴也逐渐恢复到震前的方向。福建地区从1995年到2003年地壳运动速度场与应变场随时间的变化过程,反映了集集大地震发生前后区域应力场加强、弹性应变能积累,震时和震后弹性应变能快速释放与逐渐调整恢复的过程。     

基于GNSS应变时序的云南地区构造运动与地震事件孕震模式分析

基于2011年以来云南地区59个GNSS测站的连续观测资料,计算面应变异常网格变化的时间序列,结合异常格网所在区域的动力学和地质构造背景、断层活动特性及震源机制等对区域异常的时空分布特征及地壳形变异常与地震事件之间的关系进行综合分析,并以2013-08-28发生的5.1级德钦地震为例验证基于应变时序孕震分析方法的有效性。结果表明,在宏观分析区域面应变长期背景特征的基础上,基于区域断裂活动性质和应变时间序列分析探讨面应变短期异常与地震事件之间关系的分析方法具有一定的科学合理性,能够在地震发震前夕得到有效的预报信号。     

若羌6．6级地震形变前兆异常的对比观测研究

研究了１９９３年若羌６．６级地震前库尔勒地震台多种形变（应力、应变）对比观测资料，结果表明，前期异常始于１９９０年底，主体异常始于１９９３年２月，震前２─４个月是异常发展的高潮期。各手段观测到的异常彼此呼应，相互印证；起始和转折变化时间，或同步一致，或相继跟随；它们的异常幅度（量级）相差较大，在１０－６─１０－４之间；异常形态各有特点，而又不无相似。朝向震中的应变观测元件异常最明显，而倾斜矢量异常方向都背向震中。     

信阳台伸缩仪降雨干扰特征分析

利用2013～2016年信阳台伸缩仪观测资料和降雨资料,对每次降雨后伸缩仪的变化进行分析,利用M2波潮汐因子分析仪器格值的变化情况,并对观测资料进行格值归化。最后得到信阳台伸缩仪和降雨之间的回归关系,对排除降雨干扰、识别异常有借鉴作用。     

兰州台潮汐形变观测结果与景泰6.2级地震

本文介绍了兰州形变台水管倾斜仪和石英伸缩仪1987年初至1990年底观测资料的调和分析结果和各分量的年变化,分析了M_2波γ和α因子的月重复精度及其对非潮汐变化的监测能力和本区当前的构造活动特征,对异常变化与1990年10月20日甘肃景泰Ms6.2级地震之关系作了初步探讨。     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Influence of livestock soil eutrophication on floral composition in the Pyrenees mountains

Livestock behaviour in the Pyrenees includes free grazing and a long resting period that provokes the accumulation of dung and urine in some places,so-called camping areas. The aims of this study were （i） to analyze any change in floral composition,and in nutritional and chemical contents of plants in a livestock camping area; and （ii） to relate the floral composition with soil chemical properties. In a linear transect,five sampling zones were established,from the centre of the camping area to the surrounding Nardus stricta-dominant pasture. The above ground plant biomass and the topsoil were sampled in each zone with 6 replicates per zone. Plant species were classified and weighed to calculate above ground biomass,nutritional and chemical contents,and Shannon diversity and evenness indices. Additionally,soils were sampled in two periods,at the beginning and at the end of grazing period. Soil available nutrients （nitrate,ammonium,phosphorus,potassium,calcium and magnesium）,total nitrogen,organic carbon and pH were measured.
Plant chemical contents （protein,lignin and others） were significantly related to the proportions of grasses,legumes and other plants; so,the protein content is positively correlated with legumes plant biomass while lignin content is negatively correlated with grasses. Both plant and soil nutrients increased linearly towards the centre of the camping area. However,the relationship among plant species richness,diversity and evenness relative to its position along the studied transect was bell-shaped. From the outskirts to the centre of the camping area,plants with low nutrient demand were progressively replaced by those with medium and high nutrients demand and by pioneers.
Nardus stricta-dominant pasture has low plant diversity and plant nutrient content as well as a poor soil nutrient availability. The presence of the camping area introduced patches with more soil nutrients and new species in the large spatial scale. However at a small spatial scale,the strong soil nutrien     

General Table of Contents(Vol.11,2014)

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介绍GPS定位中的几个概念

文章概略介绍了利用卫星进行定位的原理 ;由卫星信号传播、信号接收和SA政策等引起的理论误差 ;给出了多种快速、高精度定位的工作模式和观测点选择的原则 ;列出了将WGS - 84坐标转换为我国坐标的公式及解算参数的具体方法 ,供读者在GPS工作中参考。