Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999

Jann Yenq Liu; Yuh Ing Chen; Hau Kun Jhuang; Yu Hsiang Lin

doi:10.3319/TAO.2004.15.3.371(EP)

Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999

Jann Yenq Liu, Yuh Ing Chen, Hau Kun Jhuang, Yu Hsiang Lin

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88 Scopus citations

Abstract

In this paper, we examine variations in the critical frequency foF2 recorded by an ionosonde, and the total electron content (TEC) derived from a network of 5 ground-based receivers of the global positioning system (GPS), as well as occurrences of 144 M ≥ 5.0 earthquakes in Taiwan during 1997 - 1999. Results show that the foF2 and TEC yield similar tendencies, and often concurrently register pronounced decrease anomalies 4 days before the earthquakes. A detailed investigation of anomalies appearing before and after the earthquakes confirms significant decreases in the FoF2 and TEC to be the pre-earthquake anomalies.

Original language	English
Pages (from-to)	371-383
Number of pages	13
Journal	Terrestrial, Atmospheric and Oceanic Sciences
Volume	15
Issue number	3
DOIs	https://doi.org/10.3319/TAO.2004.15.3.371(EP)
State	Published - Sep 2004

Keywords

Earthquake
GPS
Global positioning system
Ionosonde
Ionosphere
TEC
Total electron content

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10.3319/TAO.2004.15.3.371(EP)

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title = "Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999",

abstract = "In this paper, we examine variations in the critical frequency foF2 recorded by an ionosonde, and the total electron content (TEC) derived from a network of 5 ground-based receivers of the global positioning system (GPS), as well as occurrences of 144 M ≥ 5.0 earthquakes in Taiwan during 1997 - 1999. Results show that the foF2 and TEC yield similar tendencies, and often concurrently register pronounced decrease anomalies 4 days before the earthquakes. A detailed investigation of anomalies appearing before and after the earthquakes confirms significant decreases in the FoF2 and TEC to be the pre-earthquake anomalies.",

keywords = "Earthquake, GPS, Global positioning system, Ionosonde, Ionosphere, TEC, Total electron content",

author = "Liu, \{Jann Yenq\} and Chen, \{Yuh Ing\} and Jhuang, \{Hau Kun\} and Lin, \{Yu Hsiang\}",

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TY - JOUR

T1 - Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999

AU - Liu, Jann Yenq

AU - Chen, Yuh Ing

AU - Jhuang, Hau Kun

AU - Lin, Yu Hsiang

PY - 2004/9

Y1 - 2004/9

N2 - In this paper, we examine variations in the critical frequency foF2 recorded by an ionosonde, and the total electron content (TEC) derived from a network of 5 ground-based receivers of the global positioning system (GPS), as well as occurrences of 144 M ≥ 5.0 earthquakes in Taiwan during 1997 - 1999. Results show that the foF2 and TEC yield similar tendencies, and often concurrently register pronounced decrease anomalies 4 days before the earthquakes. A detailed investigation of anomalies appearing before and after the earthquakes confirms significant decreases in the FoF2 and TEC to be the pre-earthquake anomalies.

AB - In this paper, we examine variations in the critical frequency foF2 recorded by an ionosonde, and the total electron content (TEC) derived from a network of 5 ground-based receivers of the global positioning system (GPS), as well as occurrences of 144 M ≥ 5.0 earthquakes in Taiwan during 1997 - 1999. Results show that the foF2 and TEC yield similar tendencies, and often concurrently register pronounced decrease anomalies 4 days before the earthquakes. A detailed investigation of anomalies appearing before and after the earthquakes confirms significant decreases in the FoF2 and TEC to be the pre-earthquake anomalies.

KW - Earthquake

KW - GPS

KW - Global positioning system

KW - Ionosonde

KW - Ionosphere

KW - TEC

KW - Total electron content

UR - https://www.scopus.com/pages/publications/7244224895

U2 - 10.3319/TAO.2004.15.3.371(EP)

DO - 10.3319/TAO.2004.15.3.371(EP)

M3 - 期刊論文

AN - SCOPUS:7244224895

SN - 1017-0839

VL - 15

SP - 371

EP - 383

JO - Terrestrial, Atmospheric and Oceanic Sciences

JF - Terrestrial, Atmospheric and Oceanic Sciences

IS - 3

ER -

Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999

Abstract

Keywords

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