| 2008年汶川地震前电离层异常研究 |
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| 引用本文： | 熊晶,吴云,周义炎,林剑. 2008年汶川地震前电离层异常研究[J]. 大地测量与地球动力学, 2011, 31(2): 28-31 |
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| 作者姓名： | 熊晶 吴云 周义炎 林剑 |
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| 作者单位： | 1)中国地震局地震研究所，武汉 4300712)地壳运动与地球观测实验室，武汉 430071 |
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| 基金项目： | 国家科技支撑项目(2008BAC35B02); 中国地震局地震研究所所长基金(IS200956018) |
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| 摘 要： | 利用FORMOSAT-3/COSMIC提供的2007—2010年掩星剖面数据，研究汶川Mw7.9地震前，孕震区及磁共轭区上空电离层的变化。研究表明，震前5天内（5月7—11日），孕震区电离层F2层最大电子密度NmF2值在4：00—8：00UT（12：00—16：00LT）相对于震前6～17天（4月25—5月6日）明显减小，幅度达（2～4）×10 5 el/cm 3。另外，取2007—2010年（不包括2008年）5月7—11日下午12：00—14：00LT孕震区上空的NmF2值作为多年背景值，发现2008年震前5天的NmF2值相对多年同时段背景值明显减小，幅度为（2～4）×10 5 el/cm 3。并且在孕震区对应的磁共轭区也有与上述类似的现象出现。
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| 关 键 词： | COSMIC 电离层 地震 全球定位导航系统 无线电掩星 |
IONOSPHERIC ANOMALIES DETECTED BEFORE 2008 WENCHUAN EARTHQUAKE |
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| Xiong Jing,Wu Yun,Zhou Yiyan,Lin Jian. IONOSPHERIC ANOMALIES DETECTED BEFORE 2008 WENCHUAN EARTHQUAKE[J]. Journal of Geodesy and Geodynamics, 2011, 31(2): 28-31 |
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| Authors: | Xiong Jing Wu Yun Zhou Yiyan Lin Jian |
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| Affiliation: | 1)Institute of Seismology, CEA, Wuhan 4300712)Crustal Movement Laboratory, Wuhan 430071 |
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| Abstract: | On 12 May 2008 at 06:28UT a major earthquake of Mw 7.9 struck Wenchuan County(31.0°N,103.4°) in China. Occultation profiles derived from FORMOSAT 3/COSMIC between 2007 and 2010, were used to investigate the ionoshperic precursor of the Wenchuan earthquake area and magnetic conjugate area. Relative to the NmF2(F2 peak electron density) of 6-17 days(25 April-6 May) prior to earthquake, it has been determined that near the epicenter the NmF2, decreased during 04:00-08:00UT(12：00-16：00LT) within 5 days(7-11 May) prior to the earthquake,and the maximum deviation was about (2-4)×10 5 el/cm 3. Furthermore we choose the NmF2 data derived from 3 years(12：00-14：00LT ,7-11 May,2007-2010, except 2008) as background value. The NmF2 5 days prior to earthquake was lower than background value. The maximum deviation was about (2-4)×10 5 el/cm 3. And there was similar phenomenon detected in magnetic conjugate area. |
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| Keywords: | COSMIC ionosphere earthquake GNSS radio occultation |
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