本論文利用全球電離層圖(Global Ionospheric Map, GIM)的全
電離層電子含量(Total Electron Content, TEC)研究 1999-2014 年
環太平洋地震帶上的地震電離層前兆(seismo-ionospheric precursors,
SIPs)。分析環太平洋地震帶上 5 個區域為台灣、蘇門答臘、
南美洲、日本和中美洲。以 15 天為背景計算規一化 TEC 與 Z 檢定判
斷可能的前兆出現時間。利用接收者作業特徵曲線評估前兆的預測
性。檢視台灣地區 129 筆規模 M≧5.5 的地震後發現，前兆時間發生
在地震前 2-4 天 1600-2000LT 種類為負異常。而蘇門答臘 153 筆規
模 M≧6 的地震，前兆則出現在地震 1-2 天前的 0200-0600LT。南美
洲 3-5 天前 1800-2300LT 負異常預測 151 筆地震有較好的效果。日
本地區 220 筆地震分析的結果顯示地震電離層前兆出現在地震 1-4
天前的正異常。而中美洲地區 1991-2014 年 122 筆規模大於 6 個地
震前兆出現在 10-15 天前，種類是負異常。規模越大的地震強照現
象越強烈，顯示可能有能量漏釋的現象。

Evidence of the seismo-ionospheric precursor (SIP) is reported by statistically
investigating the relationship between the total electron content
(TEC) in global ionosphere map (GIM) and earthquake of Circum-Pacific
seismic zone during 1999-2014. This paper was studied the earthquakes
occurred in Taiwan, Sumatra, South America, Japan, and Central America.
A median-based method together with the z test is employed to examine
the TEC variations 30 days before and after the earthquake. The receiver
operating characteristic (ROC) curve is then used to evaluate the efficiency
of TEC for predicting earthquakes during a specified time period. It is
found that the TEC significantly decreases 1600-2000 LT in 2-4 days before
the 129 M≥5.5 earthquake in Taiwan. The statistical result in Sumatra
shows that TEC reductions appeared 0200-0600 LT 1-2 days before 153 M
6.0 earthquakes. 151 M 6.0 earthquakes in South America was studied
and TEC significantly decreases 1800-2300 LT 3-5 days before earthquakes.
An abnormal increase was found 1-4 days before 220 M 6.0
earthquakes in Japan. The TEC in Central America decrease 10-15 days
before 122 M6.0 earthquakes

Chen, Y. I., Huang, C. S., Liu, J. Y., 2014. Statistical evidence of seismoionospheric
precursors of the GPS total electron content in China,
submitted to the iSTEP special issue of Journal of Asian Earth Sciences.
Fawcett T., 2006. An introduction to ROC analysis. Pattern Recognit. Lett.
27, 861-874.
Heki, K., 2011. Ionospheric electron enhancement preceding the TohokuOki
earthquake, Geophys. Res. Lett., 38,
L17312,doi:10.1029/2011GL047908, 2011.
Hayakawa, M., Seismo-Electromagnetics. Journal of the Institute of Electronics,
Information and Communication Engineers. Vol. 82, 280-282,
1999.
Ho, Y. Y., Jhuang, H. K., Su, Y. C., Liu, J. Y., 2013 Seismo-ionospheric
anomalies in total electron content of the GIM and electron density of
DEMETER before the 27 February 2010 M8.8 Chile earthquake, Advances
in Space Research, 51, 2039-2015,
doi.org/10.1016/j.asr.2013.02.006.
Le, H., Liu, L., Liu, J. Y., Zhao, B., Chen, Y., Wan, W., 2013. The ionospheric
anomalies prior to the M9.0 Tohoku-Oki earthquake, Journal
of Asian Earth Sciences, 62, 476-484, doi:10.1016/ j.jseaes.2012.10.034.
Liu, J.Y., Chen, Y.I., Pulinets, S.A., Tsai, Y.B., Chuo, Y.J., 2000.
Seismo-ionospheric signatures prior to M>6.0 Taiwan earthquakes.
Geophysical Research Letters 27, 3113-3116.
Liu, J.Y., Chuo, Y.J., Shan, S. J., Tsai, Y.B., Chen, Y.I., Pulinets, S.A., Yu,
S.B., 2004a. Pre-earthquake ionospheric anomalies registered by
continuous GPS TEC measurement. Annales Geophysicae 22, 1585-
1593.
Liu, J.Y., Chen, Y.I., Jhuang, H.K., Lin, Y.H., 2004b. Ionospheric foF2
and TEC anomalous days associated with M>5.0 earthquakes in Tai-
108
wan during 1997-1999. Terrestrial Atmospheric and Oceanic Sciences
15, 371-383.
Liu, J.Y., Chen, Y.I., Chuo, Y.J., Chen, C.S., 2006. A statistical investigation
of pre-earthquake ionospheric anomaly. Journal of Geophysical
Research 111, A05304, doi:10.1029/2005JA011333.
Liu, J.Y., Chen, Y.I., Chen, C.H., Liu, C.Y., Chen, C.Y., Nishihashi, M., Li,
J. Z., Xia, Y.Q., Oyama, K.I., Hattori, K., Lin, C.H., 2009. Seismoionospheric
GPS total electron content anomalies observed before the
12 May 2008 Mw7.9 Wenchuan earthquake. Journal of Geophysical
Research 114, A04320, doi:10.1029/2008JA013698.
Liu, J.Y., Chen, Y.I., Chen, C.H., Hattori, K., 2010a. Temporal and spatial
precursors in the ionospheric global positioning system (GPS) total
electron content observed before the 26 December 2004 M9.3 Sumatra-Andaman
Earthquake. Journal of Geophysical Research 115,
A09312, doi:10.1029/ 2010JA015313.
Liu, J.Y., Chen, C.H., Chen, Y.I., Yang, W.H., Oyama, K.I., Kuo, K.W.,
2010b. A statistical study of ionospheric earthquake precursors monitored
by using equatorial ionization anomaly of GPS TEC in Taiwan
during 2001-2007. Journal of Asian Earth Sciences 39, 76-80.
Liu, J.Y., Le, H., Chen, Y.I., Chen, C.H., Liu, L., Wan, W., Su, Y.Z., Sun,
Y.Y., Lin, C., Chen, M.Q., 2011. Observations and simulations of
seismoionospheric GPS total electron content anomalies before the 12
January 2010 M7 Haiti earthquake. Journal of Geophysical Research
116, A04302, doi:10.1029/2010JA015704.
Liu, J.Y., Chen, C.H., Tsai, H.F., Le, H., 2013. A Statistical Study on
Seismo-Ionospheric Anomalies of the Total Electron Content for the
Period of 56 M≥6.0 Earthquakes Occurring in China During 1998-
2012. Chinese Journal of Space Science 0254-2164/2013/33(3), 258-
269.
Tsai, Y. B., Liu, J. Y., Ma, K. F., Yen, Y. H., Chen, K. S., Chen, Y. I., Lee,
C. P., 2006., Precursory phenomena associated with 1999 Chi-Chi
earthquake in Taiwan as identified under the iSTEP program, Physics
and Chemistry of the Earth, 365-377.