A Study on Crustal Activity Detecting System and Construct ion of EM Field Measuring Network

研制并验证了测量极低频磁场的高灵敏度、高防雷传感器。我们证明了我们测量到的辐射受到地震的调制。提出了利用隐马尔可夫模型（HMM）从日变化模式中检测异常的方法，并证明了该方法的有效性。提出了基于拟l范数的信号分离方法，并证明了该方法的有效性。我们表明，微弱但异常的电磁辐射能够通过聚焦在方位角标准差检测。

We developed and verified the high-sensitive andhigh-thunder-proof sensor measuring the ELF band magnetic field. We showed that thesferics measured by us were modulated by the earthquake. We proposed the method of detecting anomaly from the daily variation pattern using Hidden Markov Model(HMM), and showed validity. We proposed the signal separation method based on quasi-Ll norm, and showed validity. We showed that weak but anomalous electromagnetic radiations were able to detect by focusing on the azimuthal standard deviation.