An analysis of anomalous weather and cli mate around the M S= 6.2 earthquake of Zhangbei region

ＩｎｔｒｏｄｕｃｔｉｏｎＡｔｅｉｇｈｔｔｏｔｗｅｌｖｅｏ′ｃｌｏｃｋｏｎＪａｎｕａｒｙ１０,１９９８,ｔｈｅｒｅｏｃｃｕｒｅｄａｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｏｆＭＳ＝６．２ａｔＺｈａｎｇｂｅｉＣｏｕｎｔｙｉｎｔｈｅｎｏｒｔｈｗｅｓｔｅｒｎｐａｒ...     

利用防火墙构建网络安全系统

介绍了河南省气象局目前选用的防火墙类型、防火墙体系结构，以及防火墙技术未来的发展趋势。     

位于预测区边缘附近的地震统计检验问题

对位于地震预测工作所圈定的地震危险区附近的地震的统计检验问题 ,一直是地震预测研究中一个颇有争议的问题。本文以中国地震局全国年度地震趋势会商的情况为例 ,对这一问题进行了探讨。结果表明 ,将所划定的地震危险区适度扩大 ,即将现有的地震危险区范围向外扩大约 0 5° ,可以显著地提高预测地震的“命中率”。但从统计检验的角度说 ,这样做并不能提高实际地震预测的能力 ,亦即并不能使R值有显著的提高。     

Glacier Changes at Svartisen,Northern Norway,during the Last 125 Years:Influence of Climate and Other Factors

The two ice caps of Svartisen,at the latitude of the Arctic Circle in Norway,supply 60 glaciers,ranging in size from >50 to <1 km2.Until the last two decades of the 19th century,the glaciers remained close to their maximum recent(Little Ice Age) size.In response to the prevailing 20th century climate,they have become smaller,but the changes have varied between glaciers.Climatic factors have not been the sole control of the variations.The response times of small,steep glaciers are shorter than those of the l...     

富铯矿物及其在核废物地质处置上的意义

自然界中最常见的铯矿物主要有铯沸石、富铯的云母类矿物和富铯的绿柱石类矿物,它们产于稀有金属花岗岩和LCT(Lithium-Cesium-Tantalum)型稀有金属伟晶岩脉体的中心部位或围岩接触带附近,形成于初始富含铯和挥发组份、处于稳定构造环境且经过高度演化分异的原始花岗质岩浆.由于天然富铯矿物中铯含量一般可达15%,它们的合成相可作为核废料中放射性元素137Cs的前景载体相,而且富铯矿物各自的化学成分和结构等矿物学特征,对137Cs核废物载体相及相应的深埋藏地质环境的选择和载体相在不同地质环境下的行为预测都有较好的指导意义.     

Effects of sedimentary layer on earthquake source modeling from geodetic inversion

Ground deformation as observed with GPS or InSAR has been broadly inverted in constraining source parameter of earthquakes. However, for earthquakes occurring beneath sedimentary basins, the very slow sub-surface shear velocity (v S , down to 200 m/s) may cause substantial bias to earthquake source inversion if simple crustal models are used. For Bohai basin, Sichuan basin and rock-sites, we test effects of sub-surface shear velocity structure on ground deformation, and find that up to a factor of 2 overest...     

利用中国地壳运动观测网络研究中国大陆相对于ITRF97板块模型形变

在建立全球ITRF97板块运动模型的基础上,利用"中国地壳运动观测网络"79个GPS基本站的数据,建立我国新的地壳运动方向图和块体运动模型.通过与NNR-NUVEL1A地质模型比较认为,ITRF97板块运动模型反映了现今十几年跨度的地壳运动,在研究我国现今几年到十几年时间跨度的地壳形变时,地壳运动背景场应采用基于ITRF97实测速度场建立欧亚板块运动模型.     

磁对流湍流对太阳P模振动的影响(英文)

为了进一步探索太阳对流区的物理性质 ,我们利用高精度N的日震观测数据来研究太阳内部扰动磁场对低阶太阳P模振动的影响。对于一个时间相关的MHD湍流源 ,我们给出了导致频率变化的各种可能性。如果只考虑磁扰动的贡献 ,不同值的振动模的频率变化仅只是涨落磁场能谱的函数。我们发现频率的变化随着太阳内部磁场强度增加而变大 ,并且和太阳活动周期密切相关。我们的计算表明太阳磁活动导致的频率变化可达 0 .3μΗz。     

IRAS 10173+0828的翘曲拱核环中的 OH超脉泽

对IRAS 10173+0828的拱核环中的OH超脉泽进行MERLIN§高分辨观测,得到了拱核环为翘曲的证据,同时得到了10个速度通道中OH超脉泽的等强度轮廓线向东西方向延伸的角尺寸与其相应速度通道中峰束流量密度成正相关关系.     

Interpreting the Tyrrhenocythere (Ostracoda) signal from Palaeolake Kopais, central Greece

A long Late Quaternary sedimentary record from Lake Kopais, central Greece, has yielded assemblages of ostracod shells amongst which are discrete horizons of Tyrrhenocythere donetziensis . To date, this species has been little recorded in the region. We provide details of the species' occurrence and ecology and examine its validity as a palaeoecological and palaeobiogeographical marker. Although Lake Kopais has been artificially drained, a continuous record of climate change extending well beyond the onset of the last glacial has been recorded in calcareous sediments taken from the deepest part of the basin (core K93). Ostracod assemblages occur through most of the core, however, T. donetziensis is present only in the lower part. The evidence from this study of core K93 suggests that warm, humid conditions in the catchment may be one of the limiting factors for the occurrence of this particular species of Tyrrhenocythere .