本文選題：地磁場　切入點：極化方法　出處：《地震學報》2017年04期

【摘要】：以成都臺FHDZ-M15地磁組合觀測系統(tǒng)產(chǎn)出的秒采樣觀測數(shù)據(jù)為研究對象,應用極化方法提取該臺站附近幾次中強震前的超低頻(ULF)磁異常信號.成都臺極化值長期曲線具有一定的年變化特征,利用傅里葉擬合消除周期變化后,對殘差進行分析.結果顯示,極化值增高現(xiàn)象與其后2個月內(nèi)臺站周邊區(qū)域的ML≥5.0地震有很好的對應關系,高值異常持續(xù)3—5日,與外空場活動無關,且逆沖型地震前的極化值異常幅值高于走滑型地震.
[Abstract]:The second sampling observation data produced by the FHDZ-M15 geomagnetic combined observation system of Chengdu station are taken as the research object. The ultralow frequency (ULF) magnetic anomalies before several moderate and strong earthquakes near the station were extracted by polarization method. The long term polarization curve of Chengdu station has a certain annual variation characteristic, and the periodic variation is eliminated by Fourier fitting. The residual error is analyzed. The results show that the phenomenon of increasing polarization value has a good correspondence with the ML 鈮，

本文編號：1672949