芦山MS7.0地震前的电磁异常信号

对南北地震带18个地电场及电磁扰动观测台站进行了跟踪与研究, 2013年4月20日四川芦山M_S7.0地震前只有其中5个台站观测到了异常电磁信号. 研究表明, 地震前的这些异常信号时空分布非常不均匀. 在时间上表现出震前电磁异常信号在出现的台站上不是同步的, 且随着时间的推移有向震中方向迁移的趋势; 在空间上体现在成都以北的台站都没有记录到震前电磁异常信号, 主要出现在成都及其以南的一些台站. 芦山M_S7.0地震前地震电磁信号出现的最早时间是震前21天, 其次是震前16天; 临震时间则为震前5天、 4天和1天. 通过接地极注入地下的大电流以及以往的震例分析, 认为仙女山台是又一个比较突出的电磁信号观测的敏感点.      

宝应模拟电磁扰动前兆异常特征

通过对2006-2011年宝应模拟电磁扰动监测范围内3-4级地震前异常变化的时、空、强的特征统计和分析,认为宝应模拟电磁扰动仪器具有较好的地震短临预测能力,归纳仪器的异常通道、异常起始时间、最大振幅变化和异常频次与地震间的特征联系,并对震例中出现的特殊情况进行探讨,认为未来在立足观测的同时,还需根据仪器所处的地质和地震情况,综合其他观测手段开展地震预测研究工作。     

Research on amplitude spectrum of precursory electromagnetic radiation associated with the impending great earthquake of Gonghe in Qinghai Province

The high accuracy, automatic, digital MT measurement system with five electromagnetic components was firstly adopted by the author to the section MT monitor and measurement in the middle Qilian mountain in the Northwestern China, the more real precursory information of impending earthquake electromagnetic rediation of GongheM=7.0 earthquake (April, 1990) in Qinghai province was obtained by the system. The new complete quantification frequency analysis was firstly used in this paper in both time and space domains for the analysis of repeated measurement data at all sites. This paper concludes the precursory spectral characteristics of electromagnetic radiation before strong earthquake as following: 1. The spectra appears as the synchronous electric field interference type mainly of conduction current; 2. Narrow band (0.5 – 20s) of spectral period; 3. The singularity of amplitude (the pulse amplitudes of interference electric field is 10² times the normal values); 4. They show the directionality of preparing focus to some extent; 5. The intermittent of radiation (three peak periods appeared three days before the main shock). It is more significant that there existed a relative quiet period of about 48 hours between the peak period and the occurrence, observators can response quickly at observational sites and take it as one of the observational criterions for impending prediction. This paper also points out that the impending earthquake electromagnetic radiation obtained by the MT measurement system is mainly the conduction current, and the high-conductive layer existed commonly in the crust may serve as the better paths for the conduction current circuit and enables the far away MT measurement sites to receive it. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 186–193, 1993.     

山西夏县中心地震台电磁波观测系统的稳定性及映震特征分析

对山西省地震局夏县中心地震台DJY-2000A型地震电磁波脉冲观测系统的观测．资料进行了分析，认为，要对已获得的电磁前兆信息作出真实评价，除对观测系统进行定期标定外，仪器稳定性是决定其映震能力的一个重要因素。实践表明，该观测项目出现的异常与一些中强地震有明显的对应关系。     

Establishment of the ELF Network in Yunnan and Electromagnetic Precursory Monitoring Results of the Yangbi MS5.1 Earthquake on March 27, 2017

This paper summarizes the layout of the Yunnan seismic ELF electromagnetic observation network, site selection, ELF electromagnetic instrument system, data processing and other construction. The principle and method of using the ELF electromagnetic wave technique to monitor and predict earthquakes are expounded. The long term monitoring of ELF electromagnetic fields is carried out in the Yunnan earthquake prone area, and at the same time, the changes in electrical parameters and spatial electromagnetic fields of the regional crustal medium structure are monitored. The functions such as automatic, quasi real time, remote monitoring, network monitoring, data processing specialization, data service, data sharing and industrialization of the ELF electromagnetic observation data have been realized. In order to capture the deep electromagnetic precursory information of the earthquakes, service for earthquake prediction research, which has broad application prospects and development potential. Through the research of the seismicity of Yunnan in the trial run period of the project, the preliminary results of the extreme low frequency electromagnetic observation of the Yunnan earthquake in recent years are given. The electromagnetic precursors and the electromagnetic effects of the Yangbi earthquake are recorded. In the 3-month period before the earthquake, the power spectrum of the electric and magnetic fields, the apparent resistivity and the impedance phase in the observed signals are all abnormal, and gradually increased with time. The maximum value is reached 20 days before the earthquake, and an earthquake occurs when the change is restored to normal.     

河北广平地震台数字电扰动异常分析

自2018年1月11日,河北广平地震台数字电扰动仪NS、EW测道每日北京时间18时至次日06时出现规律性高值变化。通过观测系统检测、测区环境调查、现场实验分析、周边台站观测对比、其他台干扰形态分析及震例总结等手段,并对各种可能的影响因素进行分析论证,综合分析认为,该变化为干扰的可能性较大,非地震前异常。     

汶川8.0级大地震前电磁扰动异常变化特征初步研究

利用电磁波扰动理论,研究汶川5·12大地震前,金河、剑阁、二砂3个台站的电磁波异常变化特征。结果表明:①震前3个台站均出现电磁扰动异常,以金河、剑阁地震台显著;②电磁扰动前兆异常在时间进程上有明显的阶段性变化;③随距震中距半径的增大,电磁扰动值逐步衰减。     

肥东地震台地电阻率观测场地勘选

按照《地震及前兆数字观测技术规范》和《地震台站观测环境技术要求(第二部分,电磁观测)》(GB/T 19531.2-2004),对安徽省肥东地震台地电阻率观测场地进行了勘选,采用十字电测深法勘探地下介质的电性结构分布情况,并对观测环境进行电磁骚扰测试,经过对测量结果进行计算和初步分析处理后,认为该场地适合地电阻率台站建设...     

小波极大值方法及其在电磁异常信号提取中的应用

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。     

汶川地震与电磁扰动现象

地震发生的实质,是地球内部能量聚积和释放的过程。这些能量其中包括了电场能和磁场能。根据这一原理,郑州晶微电子科技有限公司自行研制了井下安装的电磁扰动监测仪,并获得了满意的效果。     

Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake

Based on the ionospheric electromagnetic data observed on DEMETER satellite of France, the ionospheric electromagnetic signals were analyzed within 10 days before Chile M7.9 earthquake on November 14, 2007. It is found that, low frequency electromagnetic disturbances began to increase in a large scale of latitude, and reached to a maximum one week prior to the earthquake, and at about three days before the quake, the peak values shifted to lower latitude. Taking three days as a group, spatial images of a few parameters were analyzed, from which it can be seen during the five days prior to this earthquake, the amplitude and scale of anomalies are enlarged, while the epicenter is located at the boundary of anomalous region. The anomalous tempo-spatial variation in electron density prior to the earthquake were also obtained in terms of tracing the data from revisited orbits in half a year prior to the quake.     

5月12日汶川8.0级地震强余震观测的电磁同震效应

2008年5月12日汶川8.0级大地震发生后,在武都汉王地震台及其附近地区进行了为期22d的余震序列电磁异常连续监测,观测到多次余震事件的电磁同震现象。通过与汉王强震台的地震记录数据比较发现,同震信号存在于所有的电场和磁场记录分量中,它们与地震波的到达同步,而不是在地震发生的时刻出现。地震发生时的电磁辐射信号似乎在记录数据中有所显示,但是与地震波到达观测点时的电磁信号相比幅度要小得多     

江苏及邻近地区地震电磁辐射异常与地震关系

对这20多年来江苏及其邻区的地震前的电磁波观测资料进行了整理,对出现的异常信息和地震的对应关系进行了统计分析,分析结果表明,电磁波异常信息与地震三要素有一定的对应关系,并对电磁波的性质从电磁波产生的机制和传播方式两个方面进行了探讨。     

Electromagnetic radiation anomalies before moderate and strong earthquakes

Ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｒａｄｉａｔｉｏｎａｎｏｍａｌｉｅｓｂｅｆｏｒｅｍｏｄｅｒａｔｅａｎｄｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｓ关华平，刘桂萍Ｈｕａ－ＰｉｎｇＧＵＡＮａｎｄＧｕｉ－ＰｉｎｇＬＩＵ（ＣｅｎｔｅｒｆｏｒＡｎａｌｙｓｉｓａｎｄＰｒｅｄ...     

利用DEMETER卫星数据研究武都-文县5．0级地震

简单介绍了法国DEMETER（detectionofelectro—magneticemissionstransmittedfromearthquakeregions）地震电磁卫星的科学任务,以及所搭载载荷和观测模式。利用卫星观测资料研究了2006年6月20日16点52分（UT时间）发生在我国甘肃境内的5．0级地震。结果发现,在此次震前第5天电离层就开始出现异常现象,在震前大约1～2天时,这种异常达到最大。最后简述了发展卫星观测所面临的挑战和机遇。     

Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake

Based on the ionospheric electromagnetic data observed on DEMETER satellite of France, the ionospheric electromagnetic signals were analyzed within 10 days before Chile M7.9 earthquake on November 14, 2007. It is found that, low frequency electromagnetic disturbances began to increase in a large scale of latitude, and reached to a maximum one week prior to the earthquake, and at about three days before the quake, the peak values shifted to lower latitude. Taking three days as a group, spatial images of a fe...     

数字电磁资料在地震监测中深入应用的讨论

电磁学方法是国内外公认的有良好发展前景的地震监测预报方法之一。本文提出并讨论了“地震电磁动态特征研究”课题的具体思路,供大家讨论、指正,即：通过对其全国地电场、地磁场、地电阻率、地震电磁波和GPSTEC等数据的汇集,进行数据处理方法研究,分析地震电磁场动态演化特征,定期形成“动态演化”数据产品,为相关部门分析预测地震提供背景信息;同时,积累资料和震例分析经验,为开展前兆分析方法和地震电磁效应机理等研究提供依据。     

福州地震台电磁辐射观测资料映震效能分析

利用福州地震台电磁辐射1999年以来观测资料,研究福建省内4级以上地震,中国台湾6级以上地震电磁辐射接收的异常信息,找出震前有震异常次数及有震无异常次数,从而得出福州电磁辐射观测资料的映震效能。     

电磁卫星地面对比观测原型系统地电场观测资料特征分析

通过对电磁监测试验卫星地面对比观测原型系统中古丰、寺滩和坪城地电场观测数据特征研究,结果表明：（1）3个台站的地电场观测数据均具有较为明显的正常日变化形态;（2）在磁暴发生期间,地电场各测向均记录到了同步的地电暴变化,其最大变幅均明显高于正常日变;（3）寺滩地电场记录到临震前的数据异常现象,在时间和空间上都与地震事件吻合较好。     

福州电磁波异常与闽台地震的相关性研究

利用福州电磁波观测资料,对给定时段内、范围内的闽台地区地震进行相关分析,找出福州电磁波异常与地震的相关系数,探讨福州电磁波异常信息的映震效能,为今后利用电磁波观测资料异常信息进行临震预报提供科学依据。