We analyzed the geoelectric field data recorded at Changli station from 2002 to 2010, and identified seven sets of abnormal signals after eliminating a lot of noises based on the multi-dipole observation system. The abnormal signals correspond to six ML>4.0 earthquakes that occurred within 400 km from Changli station, and appeared generally within 32 days before the earthquakes, indicating that the abnormal signals are most likely seismic electric signals (SESs). The SESs have the following characteristics:...
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