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在中国科协的关怀和支持下,1983年11月18日至24日在北京举行了全国天文、地质、地震、气象相互关系学术讨论会,参加会议的正式代表120人,提交论文报告130篇,多属交叉学科范畴。论文反映了近十余年来我国部分科学工作者在探索和研究天文、地质、地震、气象、石油、空间、地球物理、海洋、地理、环境、水文以及生物相互关系方面做了大量的工作,并已取得了一定的进展;还探索了公元2000年 相似文献
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前兆台网历史数据迁移与整合 总被引:1,自引:0,他引:1
长期以来,前兆数据的多系统、多格式、多流程给数据管理和应用带来了很大的复杂性.为此,全国实施了前兆历史数据迁移,将“九五”、模拟和人工观测历史数据迁移到“十五”数据库系统中,并解决了迁移中的代码对应、数据量纲或单位转换、数据衔接、错误纠正、数据库结构差异、数据同步等问题,整合了前兆数据系统,为数据应用带来极大便利,切实提升了前兆数据管理和共享服务能力.本文详细介绍了前兆历史数据迁移的内容、工作流程和工具软件、迁移中的技术难点、取得的成果,以及存在的问题等. 相似文献
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正2013年10月13日至15日在云南省昆明市召开了中国地球物理学会第29届学术年会.14日晚8点召开了每年一次的《地球物理学报》编委会会议,主编刘光鼎院士主持了会议,编委陈棋福、陈晓非、符力耘、郝天珧、黄清华、黄宝春、倪四道、王椿镛、王家林、王绪本、汪毓明等出席了会议,因事无法到会的常旭、何丽娟、胡祥云、刘代志、刘洪、王西文、杨宝俊、杨长春等编委发来了书面意见.编辑部刘少华、何燕、汪海英、肖台琴、张正峰、徐雅玲等参加了会议.专职副主编、编辑部主任刘少华编审做了 相似文献
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中国自改革开放开始,经过三十年的发展到现在,不得不说创造了一个奇迹。
三十年前,贫穷的中国还面临饥饿、疾病、灾难,以及各种因素威胁。改革的春风让神舟大地发生了翻天覆地的变化,也付出了沉重的代价:当我们吃饱穿暖后,却发现我们的江河变黑了、空气浑浊了、家园变丑了! 相似文献
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Walter Mangini Alberto Viglione Julia Hall Yeshewatesfa Hundecha Serena Ceola Alberto Montanari 《水文科学杂志》2018,63(4):493-512
This study analyses the differences in significant trends in magnitude and frequency of floods detected in annual maximum flood (AMF) and peak over threshold (POT) flood peak series, for the period 1965–2005. Flood peaks are identified from European daily discharge data using a baseflow-based algorithm and significant trends in the AMF series are compared with those in the POT series, derived for six different exceedence thresholds. The results show that more trends in flood magnitude are detected in the AMF than in the POT series and for the POT series more significant trends are detected in flood frequency than in flood magnitude. Spatially coherent patterns of significant trends are detected, which are further investigated by stratifying the results into five regions based on catchment and hydro-climatic characteristics. All data and tools used in this study are open-access and the results are fully reproducible. 相似文献
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目的:根据CT扫描图像及三维重建表现,探讨多层螺旋CT扫描对小肾癌的诊断及鉴别诊断的价值,并对小肾癌进行分型。资料与方法:收集行多层螺旋CT扫描并经临床病理证实的43例小肾癌病例资料,就其CT表现进行分析并进行分型。结果:凸出型小肾癌23例,CT表现为肿瘤凸向肾轮廓之外或凸向肾盂、肾盏,增强扫描时,肿瘤内部造影剂呈明显... 相似文献
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江西信江盆地丹霞地貌的成景地层为晚白垩系陆相红色碎屑岩,红层的厚度、岩石学和地球化学特征及其在盆地内出露制约着丹霞地貌的发育、景观类型及其组合以及在盆地内的分布。信江盆地边缘主要出露茅店组、河口组和莲荷组巨厚层砾岩、含砾砂岩和砂岩,以铁质胶结和少量钙质胶结为主,可溶性成分含量低,这些红层以发育高大的顶斜型峰林型、峰丛型丹霞地貌组合为特征。盆地中部的河口组上部和塘边组地层含砾砂岩和砂岩为主,以钙质胶结为主,可溶性成分含量较低,常发育低矮的圆丘状丹霞地貌组合为特征,大型岩洞是其典型的景观类型。过渡地带主要为河口组上部、塘边组和莲荷组下部的砂岩、含砾砂岩,丹霞地貌只发育于断层或河流发育地区,以顶平型丹霞地貌组合为特征。以钙泥质胶结为主,可溶性成分含量高的细碎屑岩中一般不发育丹霞地貌。 相似文献
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欧亚地震带现代构造应力场及其分区特征 总被引:1,自引:0,他引:1
利用美国哈佛大学矩心矩张量目录中的2818个地震的震源机制解资料,分析了欧亚地震带及其5个分区现代构造应力场的基本特征,给出了5个分区的震源机制主压应力方向分布图。结果表明:①欧亚地震带以逆断型和走滑型断层活动为主;②地中海地震区以走滑断层活动为主,主压应力方向为SSW向;③伊朗—阿富汗—巴基斯坦地震区以逆断型断层活动为主,主压应力优势方向为NNE—NS向;④喜马拉雅地震以逆断型为主,主压应力优势方向为NS和NE向;⑤川—滇—缅地震区以走滑断层活动为主,主应力场方向为NNE向;⑥印度尼西亚地震区以逆断型断层活动为主,主压应力优势方向为NE—SSW向。各分区的主压应力方向明显受其所在区域板块运动的影响,由此推测板块运动可能是产生欧亚地震带构造应力的主要力源。 相似文献
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西太平洋地壳年龄较老,因而岩石层较冷和比重较大,俯冲带的角度也较大,活动和成熟的弧后盆地则较多;条件与之相反的东太平洋弧后盆地则较少.本文探讨这种相关关系的力学成因,计算了俯冲板块诱生的弧后上涌地幔流动.计算表明,俯冲角度大及存在后撤俯冲时,有利于在弧后地区产生明显的上涌地幔流,这种深部热物质的上涌会导致弧后扩张.反之,年龄较轻的海洋地块较热和较轻,俯冲角度一般也较小,不易诱生上涌地幔物质流动和弧后扩张.大陆地壳密度小于地幔物质,大陆碰撞区就更不具备弧后扩张的条件. 相似文献
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应用定西地区的陆面过程野外观测资料和四次EOS_MODIS卫星资料,对典型的西北半干旱雨养农业区的基本地表特征参数进行反演,在此基础上对各能量通量和蒸散量进行估算,进而分别分析其季节和空间变化.结果表明:应用卫星数据估算的各参量的相对误差基本都在20%以内,其空间和时间变化基本反映了当地的实际情况;区域各通量和日蒸散量分布极不均匀,表现为四季相差比较大的单峰型变化特征,冬季最小、其次是秋季、夏春两季最大;与面积较大的中、低植被覆盖度区域相比,小范围的高植被覆盖度区域的地表净辐射、潜热和日蒸散量相对较高,土壤热通量和显热通量相对较低,并且都在春、夏季节表现得更加显著.低、中植被覆盖度区的各能量通量的季节变化不显著的特征反映了半干旱西北雨养农业区土壤的干土层相对比较厚的特征. 相似文献
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辽宁省主要活动断层与地震活动特征分析 总被引:6,自引:1,他引:5
本文结合编制 1:100 万辽宁省地震构造图,分析了辽宁省近 20 年来地震构造环境相关研究成果,确定辽宁地区共有第四纪以来活动断裂 29 条:全新世断裂 1 条;晚更新世断裂 5 条;早、中更新世断裂 23 条。其中北东向晚更新世活动断裂和北西向全新世活动断裂为辽宁地区的主要控震、发震构造。北东向晚更新世活动断裂与北西向断裂交汇部位、海城河隐伏断裂的端点部位和鸭绿江断裂南西端黄海海域是未来发生中强地震的主要部位。本研究可为深入研究辽宁地区地震构造条件、编制第五代全国地震区划图提供基础资料。 相似文献
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An investigation on Balakot, Muzaffarabad (Pakistan) earthquake, 8 Oct. 2005, Mw 7.6; geological aspects and intensity distribution 总被引:1,自引:0,他引:1
In this paper, the investigations on seismotectonic and intensity evaluations of epicentral and meizoseismal regions in Muzaffarabad
earthquake—8 Oct. 2005, Mw 7.6—are summarized using The European Macroseismic Scale (EMS-98). The observations are compiled
based on the field investigations and isoseismal map. The results show that the isoseismals are elongated parallel to the
reactivated Muzaffarabad fault, and the attenuation is high in the direction normal to the fault compared with the direction
parallel to it. The geotechnical investigations in Muzaffarabad Valley have helped the authors to assign intensity values
in the localities where some huge landslides are observed. Finally, the empirical laws, previously developed for intensity
attenuation in Iran in EMS-98 scale, are compared with the intensity observations here. The results are roughly consistent
with the general form of attenuation laws. However, it is found that the intensity attenuations are different in the directions
normal and parallel to the fault. 相似文献
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Earthquake-induced soft-sediment deformation structures in the Mesoproterozoic Wumishan Formation,North China,and their geologic implications 总被引:2,自引:0,他引:2
Soft-sediment structures are key to defining seismites. Two soft-sediment deformation horizons, bounded by undeformed carbonate strata, have been found in the Wumishan Formation in the Jumahe region, 175 km southwest of Beijing. One is in the lowest part of Wumishan Formation; and the other is in the uppermost part of Litho-member I. The soft-sediment structures in these two horizons fall into three categories: mould-and-sag structures, hydraulic shatterings and liquefaction dikes. The mould-and-sag structures are divided into two types: one developed in tidal-flat sediments, accompa-nied by many liquefaction-related structures and characterized by autochthonous post-earthquake sediments in sags, and the other type developed in deep-water environments, is not associated with liquefaction structures, and is overlain immediately by seismogenic tsunamites. The hydraulic shat-terings are composed of pockets of fluidization conglomerate, sand intrusions, and syndepositional faults. The liquefaction dikes fall into two categories: hydraulic-fracturing dikes and lateral-spreading dikes. The former are steep, planar, and pinch out upwards. The latter are snake-like and characterized by no diapir-related drag structures in surrounding rocks. Examination of the attitudes and strati-graphic positions of these structures suggests that these soft-sediment structures are seismogenic, and consequently, are seismites. Most seismites in the Wumishan Formation are developed near the former western, margin fault of Yanliao rift. This occurrence suggests that they could be related to movements on this fault. Other geological implications are discussed. 相似文献
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Ridge subduction and porphyry copper-gold mineralization:An overview 总被引:35,自引:0,他引:35
SUN WeiDong LING MingXing YANG XiaoYong FAN WeiMing DING Xing & LIANG HuaYing CAS Key Laboratory of Isotope Geochronology Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Research Center for Mineral Resources School of Earth Space Sciences University of Science Technology of China Hefei Graduate University of Chinese Academy of Sciences Beijing Key Laboratory for Metallogenic Dynamics ... 《中国科学:地球科学(英文版)》2010,(4)
Many large porphyry Cu-Au deposits are connected to adakitic rocks known to be closely associated with ridge subduction. For example, there are several subducting ridges along the east Pacific margin, e.g., in Chile, Peru, and South America, most of which are associated with large porphyry Cu-Au deposits. In contrast, there are much fewer ridge subductions on the west Pacific margin and porphyry Cu-Au deposits are much less there, both in terms of tonnage and the number of deposits. Given that Cu and Au are... 相似文献