全球定位系統GPS之地球科學應用日益蓬勃發展，近年來科學家研究發現大地震前電離層電子含量TEC會有異常變化。中央氣象局目前建立有上百個GPS連續觀測站，監測台灣地殼變動與斷層活動。本研究計畫將為利用中央氣象局旣有觀測站記錄資料計算電離層全電子含量。建立判別異常之參考、檢視異常與大地震之相關性，以發展統計模型以搜尋和監測台灣地區地震前兆電離層全電子含量之時空異常前兆。98年度比對電離層時間空間參數與其他計畫之地磁變化、地殼形變、地形、水位等地震前兆以一窥未來地震可能發生之位置。同時結合中央氣象局旣有觀測以繪製電離層GPSTEC動態資料，以即時監測台灣地區電離層異常，並再一次推估未來地震可能發生之地點。The global positioning system (GPS) has broad applications in geosciences. Recently scientists study variations of the ionospheric total electron content (TEC) to search anomalies associated with strong earthquakes. The Central Weather Bureau (CWB) has set up hundreds of GPS receivers to monitor land deformation and seismicity. This project is to deduce ionospheric TEC from measurements of the CWB GPS receiver network, construct a reference for identifying anomalies of the GPS TEC, examine the relationship between ionospheric anomalies and strong earthquakes, and finally develop a statistical model to identify and monitor temporal and spatial of anomalies of the ionospheric GPS TEC in Taiwan. The working items of 2009 are cross comparing various pre-earthquake anomalies of the ionospheric GPS TEC and the other measurements, such as the geomagnetic field, land deformation, geography, well water level etc. to search the forthcoming epicenter. Meanwhile, data from the CWB GPS network are used to construct the ionospheric TEC maps to monitor pre-earthquake anomalies and to also foresee the epicenter in Taiwan. 研究期間：9901 ~ 9912
