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地震

地震 ›› 1998, Vol. 18 ›› Issue (S1): 65-70.

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地震电磁辐射定位和震级估算方法的探讨

张德齐, 王盛飞, 刘福, 张念孝, 于纪勋, 梅卫平   

  1. 中国南京 210014 江苏省地震局
  • 收稿日期:1998-06-03 修回日期:1998-06-25 出版日期:1998-10-20 发布日期:2022-09-30
  • 作者简介:张德齐,男,1937年11月出生,研究员,主要从事地震分析预报及临展电磁波研究工作。

INVESTIGATION ON THE METHOD OF ESTIMATING THE EPICENTER AND MAGNITUDE ON THE BASIS OF SEISMO-ELECTROMAGNETIC EMISSION LOCATION

Zhang Deqi, Wang Shengfei, Liu Fu, Zhang Nianxiao, Yu Jixun, Mei Weiping   

  1. Seismological Bureau of Jiangsu Province, Nanjing 210014, China
  • Received:1998-06-03 Revised:1998-06-25 Online:1998-10-20 Published:2022-09-30

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摘要： 介绍地震电磁辐射短临预报方法国家地震局“八五”攻关项目的部分成果:①采用具有较强抗干扰能力的DPJ-Ⅲ型地震电磁辐射观测仪在几十kHz的频率上进行单台来波方位扫描及定位研究,取得了二十几次观测震例,分析表明在几十kHz频率上所观测到的震前电磁辐射异常信号的来源方位与震中方位是基本符合的;②收集国内218个震例资料,得到回归方程为Ms= 2.8+2.1 lgT,r= 0.75,T为异常时间,利用这个关系式估算所预测地震的震级,在多数情况下误差为±0.5级。文章还介绍了使用上述方法时应注意的一些技术问题,例举了有关超低频段的观测震例。

关键词: 电磁辐射, 定位, 异常时间, 震级估算

Abstract: This paper introduces part of the results of the seismo-electromagnetic emission investiga-tions as a short-term and imminent earthquake prediction method in the key research project of earthquake prediction during the“eighth Five year Plan".①Investigation has been made on scanning of the azimuth of the emission source and determination of the epicenter of the im-pending earthquake, based on a single station using the highly noise-resistant DPJ-III type of seismo-electromagnetic emission instrument with working frequency of tens kHz. Observation-al data of more than twenty earthquakes have been accumulated. Analysis of the anomalous signals of seismo-electromagnetic emissions observed at frequency of tens kHz prior to the earthquakes shows that the azimuth of the emission sources usually agrees with that of the epi-centers of the impending earthquake.②Data of 218 earthquake cases in China have been col-lected and a regression formula has been obtained : Ms= 2.8 + 2.1 lgT(r= 0. 75)Where T is the duration of anomaly in days. Errors in estimating the magnitude of the impending earth-quakes by using this formula are usually less than 0. 5 magnitude unit. The paper also points out some technical details in application of the method on which attention should be paid. A number of observational examples at the ULF band have also been given.

Key words: Electromagnetic emission, Locating, Anomalous duration, Magnitude esti-mation