| dc.description.abstract | The statistical analyses are implemented on seismo-ionospheric precursors (SIPs)with the total electron content (TEC) of the global ionosphere map (GIM) associated with 11363 earthquakes in the circum-Pacific seismic belt including North America, Central America, South America, Japan, East Sea, Taiwan, Philippines, Indonesia and New Zealand during 1999-2017. The Z-test is applied to determine the criteria and characteristics of TEC anomalies related to earthquakes. The Receiver Operating Characteristic (ROC) Curve is further used to estimate the accuracy of SIPs. The results indicate that precursors above North America, Japan, Philippines, and New Zealand are all positive anomalies. In North America, the positive anomalies occur between 2000-2300UT within 24-26 days before earthquakes. In New Zealand, the positive anomalies occur between 1800-2300UT within 10days before earthquakes. In Japan, the positive anomalies occur between 0600-1200UT 1-3 days before earthquakes. In Philippines, the positive anomalies occur in 4-6 days. The SIPs with negative anomalies can been
found in Taiwan during afternoon (local time) and in Indonesia within 10 days. In addition, both positive and negative anomalies occur in Central America, South America, and East Sea. The results of ROC curve shows that the SIPs will be more accurate with the massive earthquakes. Once the magnitude of earthquakes are larger than M6.5 we can have significant SIPs in the circum-Pacific seismic belt. | en_US |