CAJ | 학술논문

利用重庆,兰州,曲靖和拉萨的电离层测高仪数据和IGS全球TEC数据,分析2008年5月12日汶川大地震前电离层参量的变化特征,发现震前2～3天多个电离层参量均出现异常增强现象,且主要出现于震中以南区域.其中f_oF_1和f_oE于震前2天的正午在重庆出现最大约4.5%和9%的相对增加.f_oEs,h'F和h_mF_2出现多次异常增加,无明显规律性,h'F的异常增加主要出现在夜间.f_oF_2和TEC在震前2～3天的午后至日落时段出现显著的异常增强.TEC在南半球磁共轭区也出现异常增强,且随时间推移具有向磁赤道漂移的趋势.f_oF_2和TEC的震前异常现象很明显且具有独特规律性,作为地震电离层异常前兆参数是合适的.根据经验公式由电离层参量估算的可能与地震过程有关的F区异常电场的量级与Pulinets基于异常电场假说的理论模拟值一致.
이용중경,란주,곡정화랍살적전리층측고의수거화IGS전구TEC수거,분석2008년5월12일문천대지진전전리층삼량적변화특정,발현진전2～3천다개전리층삼량균출현이상증강현상,차주요출현우진중이남구역.기중f_oF_1화f_oE우진전2천적정오재중경출현최대약4.5%화9%적상대증가.f_oEs,h'F화h_mF_2출현다차이상증가,무명현규률성,h'F적이상증가주요출현재야간.f_oF_2화TEC재진전2～3천적오후지일락시단출현현저적이상증강.TEC재남반구자공액구야출현이상증강,차수시간추이구유향자적도표이적추세.f_oF_2화TEC적진전이상현상흔명현차구유독특규률성,작위지진전리층이상전조삼수시합괄적.근거경험공식유전리층삼량고산적가능여지진과정유관적F구이상전장적량급여Pulinets기우이상전장가설적이론모의치일치.
The ionosonde data in Chongqing, Lanzhou, Qujing and Lhasa and the IGS TEC data are used to study the variation on some days before Wenchuan earthquake of May 12, 2008. The results show that obvious enhancement appeared in several parameters and mainly in the south of the epicenter. The f_oF_1 and f_oE showed little abnormal increment and the maximal relative enhancement (4.5% and 9% respectively) occurred at Chongqing on May 10. The variation of f_oEs, h'F and h_mF_2 were irregular. The h'F showed a bit enhancement mainly at night. The f_oF_2 and TEC showed abnormal enhancement from afternoon to sunset in two to three days ahead. The TEC enhancement also appeared in the magnetic conjugate area in the south hemisphere and drifted towards the magnetic equator. The equivalent electric field in F region estimated according to the experiential formula is coincident fairly well with the theoretically calculated one based on the abnormal electric field hypothesis by Pulinets.