地震学报（英文版）2009，Vol.22Issue(3)：251-255,5.DOI:10.1007/s11589-009-0251-7
Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake
Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake
摘要
Abstract
Based on the ionospheric electromagnetic data observed on DEMETER satellite of France, the ionospheric electromagnetic signals were analyzed within 10 days before Chile M7.9 earthquake on November 14, 2007. It is found that, low frequency electromagnetic disturbances began to increase in a large scale of latitude, and reached to a maximum one week prior to the earthquake, and at about three days before the quake, the peak values shifted to lower latitude. Taking three days as a group, spatial images of a few parameters were analyzed, from which it can be seen during the five days prior to this earthquake, the amplitude and scale of anomalies are enlarged, while the epicenter is located at the boundary of anomalous region. The anomalous tempo-spatial variation in electron density prior to the earthquake were also obtained in terms of tracing the data from revisited orbits in half a year prior to the quake.关键词
DEMETER satellite/ionosphere/electromagnetic disturbance/electron densityKey words
DEMETER satellite/ionosphere/electromagnetic disturbance/electron density分类
天文与地球科学引用本文复制引用
Xuemin Zhang,Jiadong Qian,Xinyan Ouyang,Xuhui Shen,Jinan Cai,Shufan Zhao..Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake[J].地震学报（英文版）,2009,22(3):251-255,5.基金项目
This paper is supported by Chinese National Science and Technology Program (2008BAC35B01) and Basic Research Project from Institute of Earthquake Science, China EarthquakeAdministration. （2008BAC35B01）
