基于GNSS VTEC数据的巴颜喀拉及周缘地区强震电离层异常效应及机理研究

The strong earthquakes in China mainland mainly occur in the boundary tectonic belt of Bayan har block during twenty years. It is an ideal place to investigate the law of earthquake occurrence by the unique geological and tectonic environment of this region and its high frequency and intensity of seismic activity. We should pay attention to the rule of earthquake occurrence in this area, and get precursory phenomena with universal significance before earthquakes, which is of guiding significance for earthquake forecasting. The earthquake ionospheric effect is a hot point research, which maybe provide important information for seismic precursors detection. This project will construct the accurate ionosphere VTEC model of Bayan har based on the GNSS data of Crustal movement observation network of China, and carry out the detailed research of analysis statistics, summarize the characteristics and regularity of seismo ionospheric abnormal disturbance. In addition, the project will collect and process the piezoelectric effect of typical rock mass in this region, and investigate relationship between the rock mass property of the seismic area and the ionospheric anomaly before the earthquake according to the characteristics of geological structure in the research region. The research achievements are expected to further reveal the seismo-ionospheric coupling mechanism in Bayan har, and provide a new method, new idea and new approach for earthquake short-term forecasting.

二十年来，我国大陆强震活动集中发生于巴颜喀拉地块主要边界构造带附近。该区域及周缘地质构造环境独特，地震活动频率高、强度大，是研究地震孕育规律的理想场所。重点关注这一区域的地震孕育发生规律，获取震前具有普遍意义的前兆现象，对地震预测预报研究工作具有一定指导意义。地震电离层效应作为近年来的热点研究，可能为探索地震前兆异常提供重要信息。本项目拟基于地壳运动观测网络GNSS数据，构建巴颜喀拉及周缘地区精细电离层VTEC模式。在此基础上，详细深入开展震例统计分析研究，总结地震电离层异常扰动特征与规律。收集整理该地区典型岩体压电效应资料，针对研究区地质构造特点，探讨发震区域的岩体属性与震前电离层异常之间的关系，研究成果有望进一步揭示巴颜喀拉地区的地震—电离层异常耦合机理，为地震短临预报提供新方法、新思路与新途径。

本项目基于地壳运动观测网络GNSS数据，构建巴颜喀拉及周缘地区精细电离层VTEC模式，并详细评估了模式。在此基础上，详细深入开展该地区震例统计分析研究，总结地震电离层异常扰动特征与规律，尝试揭示巴颜喀拉地区的地震—电离层异常耦合机理。本项目研究成果可为地震短临预报提供新方法、新思路与新途径。