Highlights GNSS-TEC data showed ionospheric changes immediately before the 2008 Mw7.9 Wenchuan earthquake, China. TEC trend showed positive changes in trends ∼1/2 h before the earthquake and the anomaly reached ∼5 % of the background. These anomalies are mostly consistent with worldwide trends of past examples for ∼20 earthquakes.
Abstract Ionospheric disturbances associated with large earthquakes can be observed with global navigation satellite system (GNSS) receivers on the ground as changes in total electron content (TEC). In addition to coseismic disturbances ∼10 min after earthquakes caused by acoustic-gravity waves from epicenters, there have been reports on changes immediately before very large earthquakes. We show such disturbances for the 2008 Wenchuan earthquake (Mw7.9), China, started ∼ 37 min before the main shock and reached ∼5 percent of the background value. The results of past ∼20 cases with Mw 7.3 or more exhibit simple relationships that the leading times scale with fault lengths and the intensities of the anomalies relative to the backgrounds scale with fault areas. We demonstrate that the anomaly immediately before the 2008 Wenchuan earthquake fits well with these trends but with slightly longer leading time and stronger intensity.
Ionospheric changes immediately before the 2008 Wenchuan earthquake
Advances in Space Research ; 73 , 9 ; 4539-4545
2024-02-09
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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