• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Asia-Pacific conference on environmental electromagnetics >Identification of ULF Emissions for Izu Islands Earthquakes in July 2000
【24h】

Identification of ULF Emissions for Izu Islands Earthquakes in July 2000

机译：2000年7月鉴定伊豆岛地震的ULF排放

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The purpose of this report is to find out any ULF signature for the earthquakes in Izu islands in July 2000 (associated with volcanic activity) by means of a new signal processing method. The ULF data observed at closely-spaced three stations in Izu peninsula, are subjected to the principal component analysis (PCA), and we have found that this PCA is very effective in distinguishing among different sources of ULF emissions (geomagnetic variation, man-made noise, and seismogenic emission). While, the first and second principal components are found to be associated with geomagnetic variation and man-made activity, respectively, the third principal component (residual noise like seismogenic emission if it exists) at night has indicated a significant temporal evolution; an enhancement for about 1.5 months (from early May to middle June) and a conspicuous minimum about ten days before the first earthquake on July 1 (magnitude 6.4), followed by a sharp increase a few days before the quakes. Furthermore, this component is found to be back to the background level a few months later than the quakes. This temporal pattern is in good agreement with those for previous large earthquake (Spitak, Loma Prieta, Guam and Biak earthquakes), so that this temporal evolution for the third principal component found by PCA is likely to be a precursory ULF signature of those Izu islands earthquakes with its intensity of the order of 5% of the first principal component.
机译：本报告的目的是通过新的信号处理方法在2000年7月（与火山活动相关联的伊豆群岛地震的任何ULF签名。在伊豆半岛紧密三站观察到的ULF数据经受主要成分分析（PCA），我们发现该PCA在区分不同的ULF排放来源（地磁变异，人造噪音和发酵发射）。虽然，发现第一和第二主成分与地磁变异和人造活性有关，但在夜间分别是第三主成分（如果存在的遗传发射等剩余噪声）表明了重要的时间进化;大约1.5个月（从5月份到6月初到6月份）的增强和7月1日第一次地震前十天的显着最低限度（幅度为6.4），然后在地震前几天急剧增加。此外，发现该组件将在几个月后返回到背景水平而不是Quakes。这种时间模式与以前的大地震（Spitak，Loma Prieta，Puam和Biak地震）非常一致，因此PCA发现的第三个主要成分的这种时间演变可能是那些伊豆群岛的前提ULF签名地震，其强度为第一个主要成分的5％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号