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Study on Earth Crust Anomaly Through Sound Signal Processing of ELF Band Electromagnetic-Wave Precursor

ELF波段电磁波前驱声信号处理研究地壳异常

基本信息

批准号：
11305031
负责人：
HATA Masayasu
金额：
$ 26.82万
依托单位：
CHUBU UNIVERSITY (2002)Aichi Prefectural University (1999-2001)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11305031/
关键词：
Electromagnetic-wave Precursor ELF Band Sonic Signal Processing Crust Anomaly Detection Earthquakes Volcanic Eruption Mechanism of EM radiation Distortion Energy conversion データ収集システムソニフィケーション

项目摘要

1. Anomalous electromagnetic-wave radiation has been detected in advance earthquakes and volcanic eruption by the developed high sensitive receiver of order of sub-pT per root Hertz at the ELF band of 17Hz and 223Hz2. The radiation was classified into several categories or patterns according to their way of radiation.(1)The pattern at the occasion of volcanic swarm experienced at Itoh-city, Central Japan, was appearing with severe variation in the amplitude like a discharge. The radiation mechanism is conceived due to discharge from the earth surface to the air due to electron charges by oxidization of degas which is originated from the deep melted rock or magma. The same radiation was appeared at the Miyake island's volcanic eruption on August18th of 2000.(2) The spectacular radiation was obtained when the diastrophism of islands in the course of the same Miyake volcanic eruption, the distance between Niijima and Kouzu islands separated 10cm a day, the phenomenon was also observed by GPS and seismometer simultaneously. The radiation is thought due to current compensating the change in electrical property as conductivity and dielectric constant of the earth crust distorted by mechanical pressure.(3) The smoothed increase in the radiation level was observed at the chain of earthquakes in the central Shizuoka in April to September 2001. The area was continuously subjected to the plate slip between sea and land plates in recent years. The observed anomalies were estimated from the way of radiation behavior as the possible thermal agitation noise of free electrons excited by the friction heat energy between the plates.3. Sound signal processing methods and electromagnetic-wave analysis were successfully applied to the obtained data in order to extract the spectacular precursor components and/or to eliminate the received noises.

1.研制的17 Hz和223 Hz ~ 2极低频（ELF）波段每根赫兹次pT量级的高灵敏度接收机，在地震和火山喷发前探测到了异常电磁波辐射。根据辐射方式的不同，辐射被分为几类或几种模式。（1）在日本中部伊东市发生火山群时的模式，出现了像放电一样的幅度剧烈变化。其辐射机制是由于深熔岩石或岩浆中的脱气气体氧化产生的电子电荷从地表向空气中放电。2000年8月18日三宅岛火山爆发时也出现了同样的辐射。(2)在同一次三宅火山喷发过程中，新岛与国津岛之间的距离每天相隔10 cm，当岛屿发生地壳运动时，观测到了壮观的辐射现象，GPS和地震仪同时观测到了这一现象。这种辐射被认为是由于电流补偿了地壳因机械压力而变形的电导率和介电常数的电学性质的变化。(3)2001年4月至9月，在静冈中部的地震链中观察到辐射水平的平稳增加。该地区近年来持续遭受海陆板块间的板块滑动。从辐射行为的角度，对观测到的异常现象进行了估计，认为可能是平板间摩擦热能激发自由电子产生的热扰动噪声.声音信号处理方法和电磁波分析成功地应用于所获得的数据，以提取壮观的前兆成分和/或消除所接收的噪音。