Abstract The earth’s ionosphere is considered susceptible to the seismic effects and the detection of such ionospheric perturbations associated with the earthquake has become a challenge for the short-term prediction of earthquakes. In this paper, an investigation of the changes in the ionospheric behavior is reported which may be associated with M 6.9 and its aftershock of 6.1 magnitude earthquakes at Qinghai station (geog. 33.19°N, 96.75°E, geom. 23.90°N, 169.98°E) which occurred on 13 April (∼23:49 UT, 06:19 LT on 14 Apr) and 14 April 2010 (∼01:25 UT, 06:55 LT) respectively. The observations are made using ionospheric total electron content (TEC) obtained from 10 available IGS stations in the Chinese and 2 in the Indian sector to detect seismo-ionospheric anomalies if they exists. We found anomalous depletions in the ionospheric regions ∼3–4days (on 10 April 2010) up to ∼4 TECU before the earthquake over stations close to the epicenter (<1700km). The anomalous changes in the ionosphere are observed firstly over a distant station (wuhn, ∼0800–1600 UT) during afternoon to midnight hours and few hours later over the near-by stations to the epicentre in the nighttime (∼1500–2300 UT, ∼2100–0500 LT). Our results from the case study suggest that these anomalies in ionospheric TEC may be the possible seismo-ionospheric signatures for the considered earthquake in the Tibetian plateau region.


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    Title :

    Anomalous changes in ionospheric TEC during an earthquake event of 13–14 April 2010 in the Chinese sector


    Contributors:

    Published in:

    Advances in Space Research ; 56 , 7 ; 1400-1412


    Publication date :

    2015-07-08


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English