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利用宁夏地区2011—2013年期间多期重力观测资料,采用中国地震局推广的LG-ADJ程序对观测资料进行平差处理,给出地震前后3年的区域重力场变化和点值变化图像。结合构造活动分析,对2012永宁4.6级地震前后宁夏地区重力异常变化进行研究。认为：2012年永宁地震前,测区重力场出现较好的中期前兆性变化图像,临震前短期异常突增,重力场在空间和量值上均出现大幅的上升变化,重力点值震前趋势下降-转折上升-加速上升-发震的变化,是非常值得关注的前兆异常。 相似文献
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5月12日汶川8.0级地震强余震观测的电磁同震效应 总被引：8，自引：2，他引：6
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 相似文献
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Discussion on several important problems in earthquake-related electromagnetic disturbance monitoring in China 
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下载免费PDF全文 Earthquake-related electromagnetic observation aims at finding abnormal electromagnetic variation associated with earthquake possibly. The existing studies have proved that this method is, to a large extent, effective in short-term and impending earthquake predication. This paper summarizes progress and discusses some related problems in this field. Some requirements for observation system have been proposed to improve monitoring level. As a case observation using the reformed observation system in Jinghai seismologic station, Tianjin, some results are given. 相似文献
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By use of the specialized under ground electrodes as the sensor, the Experimental Multi-station Network observed Seismic Electromagnetic
radiationsprior to the moderately strong earthquake. From the great number of electromagnetic anomalies recorded by the network continuously
for about 10 years, it can be sure that the anomalies are related to earthquakes aboveM
s 5 within 300 km. The stronger the magnitude of the earthquake is, the better the relation is. The abnormal electromagnetic
radiation information appears in a short-time before the moderately strong earthquake. The continuous automatic pen recording
shows that the electromagnetic information is the waveform of the paroxysmal wave group, and has the features of undulating
enhancement, amplitude in inversely proportion to epicentral distance, frequency increase, regional similarity of wave froms
and directivity, etc.. It also contains some quantitative elements related to the parameters of the earthquake. The above
characteristics and correlative elements can provide important bases for predicting the three elements of the earthquake.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 83–90, 1993.
Associate Professor Da-Yuan CHANG and Teacher Feng CHEN have gave us a lot of help during the study. 相似文献
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根据平凉市电磁波３年多的观测资料，分析了震前电磁波的异常特征，表明电磁波有明显的临震异常，其脉冲特征及时间与未来地震有着密切关系。指出认真对观测资料进行分析，可预知一定范围内的较强地震。 相似文献
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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。 相似文献
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汶川8．0级地震前电磁辐射异常变化特征初步研究 总被引：1，自引：0，他引：1
汶川8．0级地震前,距离震中只有35km的金河电磁波台记录到了宝贵的电磁扰动信息。本文分析了汶川5．12大地震前后该台的电磁波异常变化特征,表明：①强震前确实有电磁辐射异常存在,震前存在丰富的电磁扰动信息;②电磁扰动前兆异常在时间进程上有明显的阶段性变化特征,这可能是地震孕育不同阶段特征的反映。 相似文献
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Observations and studies of electromagnetic waves during the approaching of earthquakes 总被引：1，自引：0，他引：1
This article introduces the practical observation results of pre-earthquake electromagnetic radiations at the network of monitoring
stations in Jiangsu region in resent years and discusses the electromagnetic wave precursors during the approaching period
of earthquakes based on the observations of the electromagetic radiation signals before theM
s 6.0 Liyang earthquake of 1979 in Jiangsu province, theM
s 5.9 Heze earthquake of 1983 in Shandong province and theM
s 6.2 South Yellow Sea earthquake of 1984. 相似文献
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地电阻率短临前兆异常的判定方法研究 总被引：6，自引：0，他引：6
本文用一阶差分和相干加权计算等方法对地电阻率观测资料进行处理，其结果较好地突出了短临前兆异常。进而研究了地电阻率短临前兆变化特征及其短临预报指标；采用归一化方法将电阻率各异常参量转换为地震前兆信息量，为多种前兆方法进行综合跟踪预报提供了必要的基础资料。 相似文献
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１９９７年４－６月云南省地震局对滇西南重点监视区做了短临预报,但这期间未发生所预期的地震。而滇西南地区６级地震的背景和省内的前兆异常变化是明显的。为此,认为前兆异常是区域应力场增强的结果。异常与地震是相互伴生的兄弟关系,不是父子间因果关系,是造成地震虚报的主要原因。 相似文献
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马钦忠 《地震学报(英文版)》2008,21(6):618-628
On July 4,2006,a MS5.1 earthquake occurred in Wen’an county of Hebei Province of which the epicenter is near the Beijing city.The six geoelectric field monitoring stations have been in operation for several years around the Beijing area to examine the relationship between electric field changes and earthquake.This paper firstly explains the principle of the eliminating noise method by using multi-dipole observation system of the geoelectric field.Then the data observed at the stations are studied and a lot of abnormal signals preceding the Wen’an earthquake are selected,of which five abnormal signals of the geoelectric field are finally recognized as the precursory signals.The result shows that 1 there probably exists the precursory signals of the geoelectric field preceding the Wen’an earthquake;2 there are sensitive sites in the spatial distribution of the abnormal variation of the geoelectric field before the quack;3 the anomalous signals do not appear synchronously,and their durations are not same at dif-ferent stations;4 the amplitudes of the abnormal signals recorded at Baodi station are small,but large at Changli station,while the latter is farther from the epicentral area than the former. 相似文献
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Zhang Ping Zhao Guoze Tang Ji Liu Feng Sun Weihuai Han Bing Wang Lifeng Zhang Li 《中国地震研究》2018,32(2):254-264
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. 相似文献
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Hao Xiong 《地震学报(英文版)》1992,5(2):407-412
The paper briefly reviews the recent advances and the main trend, as well as the major subjects for future study in the research
on seismo-electromagnetic emissions. The preliminary results obtained show that the recently discovered electromagnetic emission
phenomena prior to earthquake events are objective facts and may be prospective precursor applicable for short term earthquake
prediction. Considering the complexity of the generation mechanisms, as well as the space coupling and the time variation
processes of the seismo-electromagnetic emissions, we must deeply study the essential connection between the precursory emission
phenomena and the seismogenic processes. Closely connect the field observations and theoretical research and try to comprehensively
diagnose by correlating with other precursors.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 254–258, 1991. 相似文献
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岫岩－海城５．６级地震前半年内,先后出现了义县地电阻率,台安地电阻率异常变化,这些异常信息也是该次地震成功预报和重要前兆判据之一。研究认为,震前的义县、台安地电阻异常属于“场兆”,而临震前的电磁辐射信息是“源兆”。同时,电阻率的异常变化显示出向震中迁移的特点。 相似文献
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天祝电磁波地震前兆异常特征分析 总被引：2，自引：2，他引：0
天祝电磁波出现前兆异常时对应地震很好,在短临预报中发挥了作用,天祝县地震局根据前兆异常作出的几次较好的预报,得到了甘肃省地震局的高度关注和评价。本文整理并总结了从1996~2004年这9年间的观测资料,并统计分析了前兆异常的特征,为天祝地区在短临预报方面提出了地震三要素的参考量。 相似文献