DocumentCode :
3604655
Title :
Temporal and Spatial Ionospheric Variations of 20 April 2013 Earthquake in Yaan, China
Author :
Jun Tang ; Yibin Yao ; Liang Zhang
Author_Institution :
Sch. of Civil Eng. & Archit., East China Jiaotong Univ., Nanchang, China
Volume :
12
Issue :
11
fYear :
2015
Firstpage :
2242
Lastpage :
2246
Abstract :
In this letter, we investigate the ionospheric variations associated with the Yaan earthquake that occurred on April 20, 2013 in China by using the total electron content (TEC) derived from ground-based Global Positioning System observations and a global ionosphere map (GIM). Geomagnetic and solar activities are taken into account. First, we focus on the coseismic ionospheric disturbances of the earthquake. The time period of the variations is about 15 min after the seismic rupture, and the maximum amplitude is about 0.1 TEC units. We then examine the preseismic ionospheric anomalies by the TEC values from the GIM and the electron density (Ne) values reconstructed by computerized ionospheric tomography. Temporal variations show that the TEC and Ne values simultaneously increased on April 5-8, 2013, which are 12-15 days before. This increase is possibly related to the earthquake. Spatial analysis shows that anomalies tend to appear around the epicenter and their conjugate points.
Keywords :
earthquakes; ionospheric disturbances; AD 2013 04 20; China; Yaan earthquake; computerized ionospheric tomography; coseismic ionospheric disturbances; geomagnetic activities; global ionosphere map; ground-based global positioning system observations; seismic rupture; solar activities; spatial ionospheric variations; total electron content; Art; Earthquakes; Global Positioning System; Indexes; Ionosphere; Receivers; Satellites; Anomaly; ionosphere; ionospheric tomography; total electron content (TEC);
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
Publisher :
ieee
ISSN :
1545-598X
Type :
jour
DOI :
10.1109/LGRS.2015.2463081
Filename :
7208815
Link To Document :
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