Ionospheric Ne disturbances before 2007 Pu'er, Yunnan, China, earthquake

• 来源期刊: 地震学报（英文版）
• 学科: 地球科学
• 年，卷（期）: 2008,（4）
• 页码范围: 425-437
• 页数: 13页
• 分类号: P318.6+3
• 语种: 英文

摘要

Selecting three half orbits near the epicenter of Pu'er earthquake, we analyzed the Ne data recorded in their revis- ited orbits during a year before this earthquake, and extracted Ne precursors. The results show that:① There are significant seasonal variations of ionospheric Are in night time, which exhibit different shapes respectively in four seasons;②There are three main shapes of Ne: single-peak, saddle-shaped and even-shaped, all of which may oc- cur in four seasons, but each season with its typical shape relatively;③Spatial images of Ne showed high values near the epicenter in 30 days before the earthquake, and there is a good correlation between anomaly and distribu- tion of earthquake in space and time, which reflects that these spatial anomalies were indeed concerned with the earthquake;④There shows a certain similarity of the Ne curves among revisited orbits, which can provide back- ground information for distinguishing and identification of seismic anomaly.