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国家自然科学基金(41074047)

作品数:7 被引量:90H指数:5
相关作者:赵国泽王立凤汤吉詹艳王阎昭更多>>
相关机构:中国地震局阿尔斯特大学中国人民解放军海军工程大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划中国地震局汶川8.0级地震应急科学考察项目更多>>
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7 条 记 录,以下是 1-10
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人工源极低频电磁技术(CSELF)和地震监测台网建设
利用电磁地球物理方法进行地震监测预测研究己经有几十年的历史,根据国内外关于地震活动和地震前出现的电磁异常或电阻率异常之间关系的分析统计,发现地震前短时间内如从几天到几分钟期间出现的异常现象和地震的发生之间存在相当高的相关...
赵国泽王立凤肖骑彬王继军汤吉陈小斌詹艳
文献传递
人工源极低频电磁波场空间分布的计算被引量:1
2022年
文中对人工源极低频(CSELF)电磁波的空间传播特征进行了较为细致的研究。CSELF电磁波的空间传播区域可划分为近区、远区和波导区。在近区和远区,CSELF电磁波的传播理论与CSAMT相似,文中整理、验证了已有文献中的场强计算公式;在波导区,借鉴无线电通信技术成果,给出了地球-大气层-电离层球形谐振腔模型的CSELF电磁波近似计算公式,并在此基础上设计了可视化软件,实现了3种坐标系下CSELF电磁波场的计算;此外,依据计算结果分析了CSELF在近区、远区、波导区的空间传播特征。研究表明:CSELF电磁场在近区和远区衰减很快,而在波导区衰减较慢;电场比磁场更早进入波导区;在地球模型下,在场源对极点波导区场强存在局部极大值,显示了与水平层状模型完全不同的电磁波传播特征。同时,在基于水平电偶极子源的频率域电磁测深中,远区测深主要依赖于磁场而非电场。文中研究为CSELF的应用提供了理论和计算方面的支持。
杨静杨静赵国泽
关键词:辐射场电磁测深
小波极大值方法及其在电磁异常信号提取中的应用被引量:7
2015年
小波极大值法作为一种数据挖掘技术已经受到关注,并在地震科学研究领域开始进行应用研究。它能在长时间的观测数据中快速提取出不同时间、不同频率的有关异常信息。文中介绍了如何应用小波极大值法提取电磁场异常信息,即利用连续小波变换计算小波系数,计算各尺度小波系数的极大值,结合表征信号奇异性的Lipschitz指数分析异常的真实性,进而研究极大值在时间分布上的特点或规律,捕捉有关的电磁异常现象。利用该方法对2013年4月20日四川芦山7.0级地震后35d的连续观测的电磁场数据进行了分析,发现存在3次电磁场异常,探讨了这些异常可能与地震活动性之间存在的关系。尽管用这种方法尚不能确定发现的电磁场异常现象与地震有某种特定的关系,但是证明了小波极大值方法在连续观测数据中提取电磁异常现象的有效性。
韩冰汤吉赵国泽毕亚新王立凤程远志
关键词:小波变换电磁异常
球状模型下人工源极低频电磁场精确解
<正>1.引言人工源极低频电磁波技术是近些年发展起来的新技术,是无线电通讯领域和地球物理领域相结合的新技术。其传播理论即不同于传统的CSAMT也不同于通信领域,在近区、远区主要是依靠传导电流进行传播,在波导区主要是依靠位...
杨静陈小斌
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我国人工源极低频电磁技术(CSELF)的发展和应用研究
<正>人工源极低频电磁技术(CSELF)是20世纪90年代在远距离深水通信技术基础上发展起来的,发射源是在地壳范围内具有一定厚度的高电阻率地区,架设长数十、上百千米的发射天线,天线两端在低电阻率区接地,在两个接地区之间由...
赵国泽王立凤汤吉詹艳陈小斌王继军肖骑彬
文献传递
Preliminary Study on the Relationship between the M_s8.0 Wenchuan Earthquake of 2008 and the Anomalies of Earth Resistivity Observed at Qingdao Seismic Station
2011年
Near-surface earth resistivity and underground water level anomalies were recorded at Qingdao seismic observatory of Shandong Province before and after the MS8.0 Wenchuan Earthquake of May 12,2008.The observed data of earth resistivity at the observatory revealed that the underground water level dropped and the resistivity increased.It is postulated that in the special tectonic setting at Qingdao observatory,the variation of stress and strain caused the change of water level beneath the station,thus,leading to the variation of earth resistivity.The relationship between the variation of stress field and the change of earth resistivity before earthquake is analyzed.
Zhang JihongZhao GuozeWang JinshengTang TingmeiQi Lijie
Advances in alternating electromagnetic field data processing for earthquake monitoring in China被引量:10
2015年
The alternating electromagnetic(EM) field is one of the most sensitive physical fields related to earthquakes. There have been a number of publications reporting EM anomalies associated with earthquakes. With increasing applications and research of artificial-source extremely low frequency EM and satellite EM technologies in earthquake studies, the amount of observed data from the alternating EM method increases rapidly and exponentially, so it is imperative to develop suitable and effective methods for processing and analyzing the influx of big data. This paper presents research on the self-adaptive filter and wavelet techniques and their applications to analyzing EM data obtained from ground measurements and satellite observations, respectively. Analysis results show that the self-adaptive filter method can identify both natural- and artificial-source EM signals, and enhance the ratio between signal and noise of EM field spectra, apparent resistivity, and others. The wavelet analysis is capable of detecting possible correlation between EM anomalies and seismic events. These techniques are effective in processing and analyzing massive data obtained from EM observations.
ZHAO GuoZeBI YaXinWANG LiFengHAN BingWANG XiaoXIAO QiBinCAI JunTaoZHAN YanCHEN XiaoBinTANG JiWANG JiJun
Deep structure beneath the southwestern section of the Longmenshan fault zone and seimogenetic context of the 4.20 Lushan M_S7.0 earthquake被引量:39
2013年
Magnetotelluric measurements were carried out along two profiles across the middle and southwestern sections of the Longmenshan fault zone(LMSf)from 2009 to 2011,after the 2008 Wenchuan MW7.9 earthquake.The former profile crosses the Wenchuan event epicenter and the latter one crosses 2013 Lushan MS7.0 event epicenter.The data were analyzed using advanced processing techniques,including phase tensor and two-dimensional inversion methods,in order to obtain reliable 2-D profiles of the electrical structure in the vicinity of the two earthquakes.A comparison of the two profiles indicates both similarities and differences in the deep crustal structure of the LMSf.West of the southwestern section,a crustal high conductivity layer(HCL)is present at about 10 km depth below the Songpan-Garzêblock;this is about 10 km shallower than that under the middle section of the LMSf.A high resistivity body(HRB)is observed beneath the southwestern section,extending from the near surface to the top of upper mantle.It has a smaller size than the HRB observed below the middle section.In the middle section,there is a local area of decreased resistivity within the HRB but there is absence of this area.The 2013 Lushan earthquake occurred close to the eastern boundary of HRB and the Shuangshi-Dachuan fault,of which the seismogenic context has both common and different features in comparison with the 2008 Wenchuan event.On a large scale,the 2013 Lushan earthquake is associated with the HCL and deformation in the crust including HCL of the eastern Tibetan Plateau.In order to assess seismic risk,it is important to consider both the stress state and the detailed crustal structure in different parts of the LMSf.
ZHAN YanZHAO GuoZeUNSWORTH MartynWANG LiFengCHEN XiaoBinLI TaoXIAO QiBinWANG JiJunTANG JiCAI JunTaoWANG YanZhao
关键词:龙门山断裂带深部结构大地电磁测量地壳变形青藏高原东部
龙门山断裂带西南段4.20芦山7.0级地震区的深部结构和孕震环境被引量:50
2013年
2008年汶川Mw7.9级地震后,于2009~2011年间,穿过汶川地震所在的龙门山断裂带中段和2013年芦山7.0级地震所在的龙门山断裂带西南段,沿两条剖面开展了大地电磁观测,使用相位张量和二维反演等多种先进的分析解释方法,获得了两条剖面的可信度高的二维电性结构.通过对龙门山西南段和芦山地震区深部结构的深入研究发现,它们与龙门山断裂带中段及汶川地震区深部结构既有相同之处,也有明显差别.西南段西侧松潘-甘孜地块上地壳高阻层下约10km深度出现地壳高导层(HCL),比中段的深度小.西南段自地表到上地幔顶部也存在龙门山高阻体(HRB),但是龙门山高阻体规模比中段的小,其内既没有与西侧地壳高导层相通的低阻层,也没有像汶川地震区那样在龙门山高阻体内部震源区附近出现局部的低阻区.芦山地震发生在龙门山高阻体东侧边界附近,在双石-大川断裂附近,但是汶川地震发生在龙门山高阻体内部,这些构成了芦山地震和汶川地震孕震环境的差异.对青藏高原东部地壳高导层与地壳变形的关系,以及龙门山断裂带不同位置潜在的地震危险性进行了分析.
詹艳赵国泽UNSWORTH Martyn王立凤陈小斌李涛肖骑彬王继军汤吉蔡军涛王阎昭
关键词:龙门山断裂带孕震环境地震危险性
基于入侵性野草优化算法的平面天线阵列的方向图综合被引量:5
2015年
针对入侵性野草优化(invasive weed optimization,IWO)算法存在早熟收敛和陷入局部最优的问题,提出了一种混沌自适应IWO(chaotic adaptive IWO,CAIWO)算法,并将改进的算法应用于平面阵列天线的方向图综合问题。计算结果表明:该算法的优化结果均优于对比文献中的结果,更适合于阵列天线方向图综合问题。
吴华宁柳超谢旭
关键词:阵列天线方向图综合早熟收敛
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