【摘要】 1999年9月14日和11月30日在四川省绵竹县清平乡和汉源乡先后发生MS5.0地震。本文通过都江堰电磁波ULF超低频观测仪震前接收到的电磁辐射信号,对观测场量的某些特征进行理论分析和估算。结果表明:理论估算是针对地下发射、空中接收的方式进行的,且针对ULF频段的磁场,与地下发射-地下接收方式的ULF频段的电场所计算的对比结果表明,此估算结果是合理的;两次地震辐射源峰值电流矩为108~106A.m量级(平均为107A.m量级),表明两次地震的孕震体与孕震过程可能不是“独立”的。更多还原

【Abstract】 On 14 December and 30 November, 1999, two earthquakes of MS 5.0 occurred respectively in Qingping and Hanyuan, Mianzhu County, Sichuan Province. This paper analyses and estimates some characters of the observed fields theoretically, according as the electromagnetic radiation signals received by Super Low Frequency (ULF) scopes in Dujiangyan City before the earthquakes occurred. The result indicates that theoretical estimation aims at the magnetic field in ULF with the method of emission from underground and reception in the air. Compared with the result that aims at the electric field in ULF with the method of emission and reception from underground, it is proved that the former is proper. During the two earthquakes, the peak value of current moment of the source radiation is 106～108 A·m (the average is 107 A·m), which indicates that the seismogenic volume and the seismogenic process of the two may be not "independent”.更多还原