强地震活动事件期间热层大气密度异常变化的探测结果  

Abnormal Variation of Thermosphere Atmospheric Density During the Period of Big Earthquake

作　　者：曾宏[1,2] 朱光武[1] 秦国泰[1] 陈华姣[1] 李永平[1] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《空间科学学报》2011年第3期318-322,共5页Chinese Journal of Space Science

摘　　要：地震活动一直是人类非常关注的自然灾害事件,其对热层大气密度的影响还不是非常清楚.2008年5月12日中国四川汶川发生震级8.0级强震事件,随后,在6月14日日本本州东部,7月5日鄂霍次克海和7月19日日本本州东海岸发生震级7.0～7.6级强震事件,利用期间中国星载大气密度探测器在630 km高度上就位探测的热层大气密度对探测结果进行综合分析,结果表明,强地震震源中心区域上空附近热层大气密度出现异常降变.在时间上,强地震发生前1～3天内就已开始出现大气密度降变,强地震发生日附近降变达到谷值,降变比达0.40～0.65.这种降变的纬度区域范围震前位于强震中心所处纬度的±3°～±9°,强震发生当日扩大到±8°～±20°.Earthquake is the natural disaster that human beings arc most concerned about,while the influence of earthquake on the density of the thermosphere is not clear.Recently,it was occurred a class of 8.0 big earthquake on May 12,2008 in Wenchuan City,Sichuan province in China.Later, a series of big earthquake events with the class 7.0~7.6 happened in the east of Honshu in Japan on June 14,Okhotsk on July 5 and the east seacoast of Honshu on July 19.During the course of earthquake events,an atmospheric density detector on board of the solar synchronous satellite at the orbital altitude of 630 km worked all the time and got a large quantity of in-situ measurement data. According to the data,it was discovered that the abnormal atmospheric density decrease over the center region of the earthquake source on the earthquake day.During the period about 1~3 days before the strong earthquake,the decrease of upper atmospheric density has been existed and reached the valley on the earthquake day with the decreasing ratio ranging from 0.40 to 0.65.Furthermore, the range of the decrease located at the latitude of±3°~±9°from the earthquake center before the earthquake,but it expanded to about±8°~±20°from the earthquake center on the earthquake day.

关 键 词：热层大气密度 强地震 

分 类 号：P353[天文地球—空间物理学]