Taiwan’ Chi-Chi Earthquake Precursor Detection Using Nonlinear Principal Component Analysis to Multi

来源 :Journal of Earth Science | 被引量 : 0次 | 上传用户:wychenjian
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
This research uses eigenvalue characteristics of nonlinear principal component analysis (NLPCA) and principal component analysis (PCA) to investigate total electron content (TEC) anomalies associated with Taiwan’s Chi-Chi earthquake of 21 September 1999 (LT) (Mw=7.6).The transforms are used for ionospheric TEC from 01 August to 20 September 1999 (local time) using data from 13 GPS receivers.The data were collected at 22°N-26°N Lat.and 120°E-122°E Long..Applying the NLPCA to the multi-channel total electron content records of GPS receivers,the earthquake-associated TEC anomalies were represented by large principal eigenvalues of NLPCA (>0.5 in a normalized set) on 14 August and 17,18,and 20 September,with allowance given for the Dst index,which was quiet for the study period.Comparisons were then made with other researchers who also found TEC anomalies on September 17,18,and 19 associated with the Chi-Chi earthquake,which cannot be detected by PCA.Consideration is also given for reported ground level geomagnetic field activity that occurred between mid-August and late October,leading up to and including the Chi-Chi and Chia-Yi earthquakes,which are associated with the same series of faults.It is possible that Aug.14 is representative of an earthquake-associated TEC anomaly.This is an interesting result given how much earlier than the earthquake it occurred.
其他文献
摘要 语感是对语言敏锐的感觉力,也是理解语言文字的基础。培养良好的语感应注重对语言的直观感受和把握,更离不开对语音、文字、词汇、句子等语文基础知识的了解与掌握。在语文课堂中如何培养小学生的语感呢?诵读、情境诱发及揣摩品味都是培养良好语感的重要手段。  关键词 感悟 诱发 揣摩    语感就是对语言敏锐的感觉力,表现为一种对语言知识的活学活用,融会贯通,一种在阅读教学实践中锤炼出来的对语言的真切领会
用N-n-Bu4MnO4,醋酸锰,2-氯丙酸在无水乙醇溶剂中合成了三核锰配合物[Mn3O(O2CCHClCH3)6(py)2(H2O)].2/3H2O(1.2/3H2O)。X-射线单晶衍射确定了其晶体结构。晶体属单斜晶系、C
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
随着社会经济的飞速发展,户外广告已成为经济发展的加速剂,在现代信息流通中起着必不可少的重要作用。漫步街头,形形色色的广告最能从一个层面上反映出这座城市的经济繁荣。
入世使中国在国际贸易中的竞争力提高,政治、经济、文化、环境方面有了长足的改善,但三年的实践,同样凸显了很多有待改善和研究的问题。从外贸本身以及企业的角度分析,有些问
日前,为期近两个月的Hercedes-AMG全国巡回路演及试驾活动全面启动,本次活动涉及包括杭州、上海、温州、广州、重庆、成都和青岛在内的7个城市。这是Mercedes-AMG不久前在中
在三相逆变器驱动的交流主动磁轴承系统中,基于磁轴承控制线圈中电流纹波是转子与定子之间气隙长度的函数,提出一种径向位移自检测方法。通过对三相交流主动磁轴承控制线圈中
处于高中阶段的学生,正处在人生中学习的最佳时期,这一时期学生的学习特点是一旦对学习产生兴趣,就会有很强的学习积极性,从而会主动学习,提高学习效率。因此,在高中物理教学
由中国药学会主办,中国药学会生物药品与质量研究专业委员会承办,沃特世科技(上海)有限公司、安捷伦科技(中国)有限公司等协办的2016年生物技术药物理化特性分析与质量研究技
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.