Seismo-Electromagnetic Study based on multiple ULF-EM stations in South East Asia

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In order to mitigate geohazard of large earthquakes with using electromagnetic phenomena, we have installed some ULF geoelecromagnetic sensors and VLF receivers in Indonesia and Taiwan, where there are less artificial noises. Not only ULF and VLF, but also GPS-TEC data have been analyzed in this project to study the lithosphere-atmosphere-ionosphere coupling. The most important finding in this project is significant decrease of GPS-TEC around geomagnetic equator 3-10 days before the earthquake with M>6 (Indonesia, Taiwan, and China regions) in statistics and a vast spatial extent of ionospheric anomaly, which is greater than 1000km.