Ionospheric perturbations before Pu’er earthquake observed on DEMETER     

朱荣  杨冬梅  荆凤  杨俊英  欧阳新艳 《地震学报(英文版)》2008,21(1):77-81

A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.  相似文献   

Spectral features of geomagnetic low point displacement and its mechanism     

张学民  钱家栋  王亚丽  赵旭  欧阳新艳  赵庶凡 《地震学报(英文版)》2008,21(5):474-484

In this paper,Changli station in Hebei Province was taken as an example,in which the minute data of geomagnetic Z component was used to analyze the spectral values of its main frequencies during normal time,geomagnetic storm time and low point displacement time interval respectively. After fitting of ten high spectral values to loga-rithmic functions,it is found that,by using same length of data,the spectral values at geomagnetic storm time in-crease apparently compared with those at normal time,especially at the high frequency segment. While low point displacement occurred,the spectral values at high frequency are approximate to those at normal time,but at period above 4 hours they are mostly lower than those at normal time. Comparison of accumulating of some FFT results at low point displacement and normal time shows that,spectral values at periods of 8.5 and 13.7 hours increase at low point displacement time relative to those at normal time. Compared with the images of Ne observed at DE-METER satellite,it is illustrated that the occurrence of geomagnetic low point displacement is well corresponding with the increase of Ne in ionosphere. Finally it was discussed about those spectral features and the occurrence mechanism of geomagnetic low point displacement.  相似文献   

微动信号的数据处理与岩土频谱特性分析     

杨博雄  胡新和  陈志高  刘海波  路杰  欧同庚 《岩土力学》2008,29(3):854-858

频谱是微动信号的一个重要动力学参数,微动信号的频谱特性与场地覆盖层厚度和地基土刚度的变化密切相关,既可反映岩土层的类型特征,又能反映工程场地的动力特性。详细探讨了目前较为常用的利用微动信号进行场地动力特性分析的方法,并对这些方法进行了研究和比较。简要介绍了功率谱估计方法,同时,通过实例分析了微动信号的变化规律和场地微动信号的频率响应特性。  相似文献   

九江地震前DEMETER卫星观测到的电离层异常   总被引：3，自引：1，他引：2  

刘静  张学民  申旭辉  欧阳新艳  黄建平 《地震》2009,29(Z1)

通过对法国DEMETER卫星观测的电磁场、电子和离子浓度及温度数据的分析,表明2005年11月26日江西九江Ms5.7地震前存在空间电离层异常现象,其中2005年11月17日、18日和21日在单个半轨道上存在较明显的异常变化,异常同步出现在电磁场和等离子体部分参量上,2005年11月22日、23日在20°～30°N范围内出现大面积的升温现象.此外,除震中区上空附近有异常变化外,在南纬的震中磁共轭区也观测到相应的扰动.  相似文献   

地面三维激光扫描技术外业数据采集方法研究简     

欧斌 《测绘与空间地理信息》2014,(1):106-108,112

  相似文献   

团结奋进依法管理创优夺冠再铸辉煌     

欧福元 《湖南地质》1996,(4)

团结奋进依法管理创优夺冠再铸辉煌ＷｉｔｈＯｎｅＭｉｎｄａｎｄＯｎｅＨｅａｒｔｔｏＢｒｉｎｇａｂｏｕｔＴｏｐＱｕａｌｉｔｙＡｃｈｉｅｖｅｍｅｎｔｓａｎｄｔｏＲｅｃｒｅａｔｅａＮｅｗＳｐｌｅｎｄｅｕｒｉｎＭｉｎｉｎｇＭａｎａｇｅｍｅｎｔｂｙＬａｗＥｘｅｃ...  相似文献   

兰州百合(Lilium davidii var.willmottiae)遗传多样性和遗传结构北大核心CSCD     

崔文娟林玉红石有太欧巧明罗俊杰 《中国沙漠》2018,(6):1267-1274

采用EST-SSR分子标记,对来自7个主要栽培区的兰州百合(Lilium davidii var.willmottiae)种质资源进行遗传多样性分析。结果显示:(1)兰州百合在物种水平上具有较高的遗传多样性,多态性位点百分率(PPB) 90.91%,Nei’s遗传多样性指数(H) 0.3256,Shannon’s遗传多样性信息指数(I) 0.4875;各栽培居群遗传多样性为西果园>榆中>魏岭>阿干>黄峪>金沟>永靖。(2)兰州百合栽培群体基因分化度Gst为0.2395,基因流(Nm)为1.5876,各栽培居群间遗传分化水平低,遗传差异主要存在于居群内。(3)兰州百合种质材料69个采样点的聚类结果显示,84.05%的材料都聚合到一个类群,这与STRUCTURE遗传结构分析的结果一致,说明兰州百合种质资源的遗传基础相对狭窄。兰州百合种质资源的遗传多样性主要由小部分种质的遗传变异引起,收集研究这些稀有特异种质,将为兰州百合育种改良及优异基因发掘提供重要参考。  相似文献   

扎格罗斯盆地Buzurgan背斜斜向逆冲断裂褶皱的几何解析及运动学模拟          下载免费PDF全文

欧成华  陈伟  韩耀祖  李朝纯 《地球科学》2016,41(3):385-393

扎格罗斯盆地因其丰富的油气资源和复杂的构造体系而深受国际石油界的重视,其中是否存在斜向逆冲断裂褶皱对于进一步深化盆地构造特征的认识至关重要.基于断裂相关褶皱理论,采用地层倾角域分析和褶皱轴面分析方法,系统地开展了扎格罗斯盆地Buzurgan背斜地震剖面的构造几何解析,获得了时间构造等T₀图、沿层时间域水平切片图和平行于断层走向的地震剖面图.在此基础上,依据斜向逆冲断裂褶皱的构造几何识别特征,解释出Buzurgan背斜的斜向逆冲断裂褶皱几何变形样式.最后通过计算机正演模拟,再现了Buzurgan背斜斜向逆冲断裂褶皱构造样式的成生过程,验证了斜向逆冲断裂褶皱解释的合理性和可靠性.   相似文献   

土地综合整治中的效益研究——以新晃侗族自治县凉伞镇和凳寨乡等两个乡镇为例     

赵湘秦  彭建伟  欧小鸥 《湖南地质》2012,(6):90-92

本文以新晃侗族自治县凉伞镇、凳寨乡等两个乡镇为例，采用静态经济评价等方法系统对农村土地综合整治进行效益分析和综合评价，研究结果表明项目实施所产生的社会效益巨大，生态效益明显，达到了社会效益、经济效益与生态效益的统一，可为其他乡镇土地综合整治提供参考。  相似文献   

放进衣兜的故乡     

欧阳新献 《河南国土资源》2007,(9):54-54

  相似文献