本研究擬建構地面高頻都卜勒探測系統、GPS接收機和磁力計網站以監測台灣地區地震發生時，電離層都卜勒頻移、電離層全電子含量和地表地磁場之異常前兆變化。由於電離層都卜勒頻移和全電子含量對地震孕震過程十分敏感，因此可用來偵測地震時間前兆，藉此推估未來地震可能發生之時間。此外，磁力計的地磁場對於測站附近地下電導力和電流的改變十分敏銳，所以可被用來搜尋未來地震可能發生之位置。電離層都卜勒頻移和全電子含量以及地磁場地震電磁之同時監測，可令科學家探究岩石層與電離層耦合作用，以及降低地震前兆之誤報並增加其成功率。近期研究顯示電離層都卜勒頻移、電離層全電子含量、地磁場地震前兆會同時出現於大地震之震央及其共軛點，為了進一步確認地震前兆，本計畫將透過國際合作於台灣和印尼同步建立地震電磁共軛觀測。 In this project, we construct ground-based HF (high frequency) CW (continue wave) Doppler sounding system, GPS receiver, and magnetometer networks to monitor variations of the ionospheric Doppler frequency shift (DSF), total electron content (TEC), and geomagnetic field associated with earthquakes in Taiwan. The ionospheric DSF and TEC are sensitive to the earthquake preparation which can be used to detect the temporal precursor, and find possible occurrence time of a forthcoming earthquake. On the other hand, the geomagnetic field is susceptible to local/nearby underground conductivity and current changes and therefore it can be employed to search possible location of the forthcoming earthquake. The simultaneous seismo-electromagnetic, the ionospheric DSF, and TEC as well as the geomagnetic field, monitoring should allow scientists to have a better understanding on the lithosphere-ionosphere coupling as well as reduce the faults alarm and increase success rate of the earthquake precursor. Meanwhile, recent researches show that prominent earthquake precursors in the ionospheric DFS/TEC and geomagnetic field simultaneously appear over both large earthquakes and their conjugate points. To further confirm the earthquake precursor being observed, this project shall via an international cooperation develop a seismo-electromagnetic conjugate monitoring in Taiwan and Indonesia. 研究期間：10008 ~ 10107
