Seimo-ionospheric anomalies detected by ground-based GPS
The collection of the precursory information of Earthquake is always an important task in Earthquake prediction. Among all kinds of earthquake precursors available, the ionospheric precursor revealed by the ionospheric anomalous variation has potential advantages. First of all, the time of the future earthquake may be determined approximately. The scale of time is about one week. Secondly,according to the spatial sizes of the ionospheric disturbance triggered by the earthquake, the magnitude of the imminent earthquake is also figured out. Finally, in terms of the geographical position of ionospheric anomaly and the distribution of geomagnetic field, the location of future earthquake epicenter may be found roughly. So, through the ionospheric precursors, the three elements concerned with earthquake forecast are determined to some extent.In this paper, we use the Vertical Total Electron Content (VTEC) derived from ground-based GPS to examine the ionospheric variation during two strong Earthquakes in China. A 10-day running mean of the vertical TEC and the associated standard deviation are utilized as a reference for identifying the ionospheric anomalies during the two earthquakes. The final results show that the ionospheric anomalies appear within 6 days prior to the earthquake. This proves that it is feasible to detect the pre-earthquake ionospheric anomalies by ground-based GPS.
Earthquake prediction ionospheric precursor GPS VTEC
ZHOU Yiyan WU Yun QIAN Xuejun ZHU Huying YANG Jian LIN Jian XIONG Jin
Institute of Seismology, China Earthquake Administration, Wuhan, China
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
328-333
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）