Study of the Perturbations of Ionosphere over South China Associated with Heyuan Earthquakes
XU Jie
DENG Baichang
YANG Jingjing
HUANG Jiang
Abstract：This paper investigated the TEC (total electron content) perturbations of low-latitude ionosphere over South China possibly associated with two moderate Heyuan earthquakes,using data monitored from ten stations located in South China and from four stations in preparation zone of Heyuan earthquake.The analysis of time series of TEC showed that TEC perturbations including negative anomalies as well as positive anomalies occurred 15 days before two Heyuan earthquakes,indicating moderate magnitude earthquakes with less destructibility being able to trigger pronounced perturbations in the ionosphere.The TEC perturbations of the ionosphere monitored from ten GPS receiver stations were lower than that from four GPS receiver stations within the preparation zone of earthquake,indicating the validity of the Dobrovolsky's formula for estimating dimensions of the earthquake preparation zone.
Keywords：Total electron content (TEC)The Dobrovolsky's formulaThe E×B drift mechanismSeismoionospheric perturbations
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 1-7 )