1999年四川绵竹5.0级地震临震电磁辐射信号的准-静电磁场场强理论估算
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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。
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”.
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”.
引文
冯竟等.1989.地震孕震体的电磁辐射机理[J].见:震前电磁波观测与实验研究文集,西北地震学报,11(1):177~181
张德齐等.1989.临震电磁辐射信号的准静电磁场场强的理论计算[J].见:震前电磁波观测与实验研究文集,西北地震学报,11(1):28~32
张德齐等.1985.临震电磁发射信号的量级估算[J].地震学刊,(4):28~32
赵珠等.2001.1999年四川绵竹5.0级地震序列揭示的孕震结构[J].中国地震,17(4):386~391
张德齐等.1989.临震电磁辐射信号的准静电磁场场强的理论计算[J].见:震前电磁波观测与实验研究文集,西北地震学报,11(1):28~32
张德齐等.1985.临震电磁发射信号的量级估算[J].地震学刊,(4):28~32
赵珠等.2001.1999年四川绵竹5.0级地震序列揭示的孕震结构[J].中国地震,17(4):386~391
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