Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan
Scientists analyzed temporal variations of local data recorded in Taiwan and reported anomalous reductions in the ionospheric to talelectron content (TEC) on days 4 and 3 be fore (17 and 18 September) the Chi-Chi earthquake (Mw 7.6, ML 7.3), and days 3 and 1 prior to (19 and 21 October) the Chia-Yi...
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Chinese Geoscience Union
2009-01-01
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doaj-fd2feb34f518477294e8aa39ca18332a2020-11-25T01:08:09ZengChinese Geoscience UnionTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802009-01-0120676910.3319/TAO.2009.01.22.01(T)876Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in TaiwanMasahide NishihashiKatsumi HattoriHau-Kun JhuangJann-Yenq LiuScientists analyzed temporal variations of local data recorded in Taiwan and reported anomalous reductions in the ionospheric to talelectron content (TEC) on days 4 and 3 be fore (17 and 18 September) the Chi-Chi earthquake (Mw 7.6, ML 7.3), and days 3 and 1 prior to (19 and 21 October) the Chia-Yi earthquake (ML 6.4) in Taiwan. In this paper, we propose a spatial analysis which compares the data recorded inside and outside of the earthquake area around Taiwan to discriminate whether the anomalies are local (earth quake related) or global (non-earth quake related) phenomena. Results suggest that the anomalies appearing day 3 before the Chi-Chi earthquake, and days 3 and 1 before the Chia-Yi earthquake are local (earthquake related) phenomena and the anomaly appearing on 17 September 1999 (day 4 be fore) might be the result of both global phenomena (i.e., a geomagnetic storm) and the local effect of the Chi-Chi earthquake. http://tao.cgu.org.tw/images/attachments/v206p769.pdf Total Electron Content (TEC)NmF2Anomalous reductionSpatial analysisThe 1999 Chi-Chi and Chia-Yi earth quakes |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Masahide Nishihashi Katsumi Hattori Hau-Kun Jhuang Jann-Yenq Liu |
spellingShingle |
Masahide Nishihashi Katsumi Hattori Hau-Kun Jhuang Jann-Yenq Liu Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan Terrestrial, Atmospheric and Oceanic Sciences Total Electron Content (TEC) NmF2 Anomalous reduction Spatial analysis The 1999 Chi-Chi and Chia-Yi earth quakes |
author_facet |
Masahide Nishihashi Katsumi Hattori Hau-Kun Jhuang Jann-Yenq Liu |
author_sort |
Masahide Nishihashi |
title |
Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan |
title_short |
Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan |
title_full |
Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan |
title_fullStr |
Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan |
title_full_unstemmed |
Possible Spatial Extent of Ionospheric GPS-TEC and NmF2 Anomalies Related to the 1999 Chi-Chi and Chia-Yi Earthquakes in Taiwan |
title_sort |
possible spatial extent of ionospheric gps-tec and nmf2 anomalies related to the 1999 chi-chi and chia-yi earthquakes in taiwan |
publisher |
Chinese Geoscience Union |
series |
Terrestrial, Atmospheric and Oceanic Sciences |
issn |
1017-0839 2311-7680 |
publishDate |
2009-01-01 |
description |
Scientists analyzed temporal variations of local data recorded in Taiwan and reported anomalous reductions in the ionospheric to talelectron content (TEC) on days 4 and 3 be fore (17 and 18 September) the Chi-Chi earthquake (Mw 7.6, ML 7.3), and days 3 and 1 prior to (19 and 21 October) the Chia-Yi earthquake (ML 6.4) in Taiwan. In this paper, we propose a spatial analysis which compares the data recorded inside and outside of the earthquake area around Taiwan to discriminate whether the anomalies are local (earth quake related) or global (non-earth quake related) phenomena. Results suggest that the anomalies appearing day 3 before the Chi-Chi earthquake, and days 3 and 1 before the Chia-Yi earthquake are local (earthquake related) phenomena and the anomaly appearing on 17 September 1999 (day 4 be fore) might be the result of both global phenomena (i.e., a geomagnetic storm) and the local effect of the Chi-Chi earthquake. |
topic |
Total Electron Content (TEC) NmF2 Anomalous reduction Spatial analysis The 1999 Chi-Chi and Chia-Yi earth quakes |
url |
http://tao.cgu.org.tw/images/attachments/v206p769.pdf
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work_keys_str_mv |
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