Temporal and spatial precursors in the ionospheric global positioning system (GPS) total electron content observed before the 26 December 2004 M9.3 Sumatra-Andaman Earthquake

Details Temporal and spatial precursors in the ionospheric global positioning system (GPS) total electron content observed before the 26 December 2004 M9.3 Sumatra-Andaman Earthquake Temporal and spatial precursors in the ionospheric global positioning system (GPS) total electron content observed before the 26 December 2004 M9.3 Sumatra-Andaman Earthquake

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11509312l&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A9, CiteID A09312

Physics

1

Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242), Ionosphere: Ionospheric Disturbances, Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields (2712), Geodesy And Gravity: Space Geodetic Surveys

Scientific paper

We report seismo-ionospheric precursors of anomalous decreases in the total electron content (TEC) appearing day 5 prior to an M9.3 earthquake, the largest one in the last five decades, which occurred in Sumatra-Andaman, Indonesia on 26 December 2004. Sequences of global ionosphere maps of the TEC derived from worldwide ground-based receivers of the global positioning system (GPS) are used to statistically study the temporal and spatial precursors of the earthquake. It was found that the temporal precursor of the GPS TEC around the epicenter was significantly reduced during the afternoon period on d 5 before the earthquake. The spatial precursors prominently, persistently, and simultaneously appear around the epicenter and its conjugate areas of the Sumatra-Andaman earthquake.

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