Abstract:Based on the MW8.0 earthquake in northern Peru on May 26, 2019, using the global ionospheric map(GIM) obtained by the center for orbit determination in Europe(CODE) and the GPS-TEC observation data provided by the international GNSS service, we analyze the changes of ionosphere total electron content(TEC) and equatorial ionospheric anomaly before the earthquake. Using the TEC grid data from May 10 to 26, 2019, we analyze the variation of equatorial ionospheric anomaly and ionospheric TEC with geographic latitude before the earthquake, and statistically analyze the daily variation anomalies of ionospheric TEC before the earthquake using the GPS-TEC data of RIOP and GLPS stations. The results show that three days before the earthquake, the equatorial ionospheric anomaly “double peaks” disappeared, and the ionospheric TEC decreased significantly, reaching about 10 TECu. At 16:00~20:00 UT three days before the earthquake, the ionospheric TEC shows a bimodal curve with latitude, and there is a trough near the epicenter. During this period, the ionospheric TEC at RIOP and GLPS stations also decreased significantly.
ZHANG Yibin,ZHONG Huixin,ZHANG Ting et al. Analysis of Low Latitude Ionospheric Changes before the May 26, 2019 Earthquake in Northern Peru[J]. jgg, 2023, 43(2): 135-140.