Ionospheric perturbations before Pu’er earthquake observed on DEMETER  

作　　者：朱荣[1] 杨冬梅[1] 荆凤[2] 杨俊英[3] 欧阳新艳[2] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]中国地震局地震预测研究所,中国北京100036 [3]中国科学院空间科学与应用研究中心,中国北京100080

出　　处：《地震学报》2008年第1期76-81,共6页Acta Seismologica Sinica

基　　金：Special Project for Earthquake Monitoring of China Earthquake Administration.

摘　　要：A destructive shock with magnitude of 6.3 occurred on 2 June 2007 at 21h34min56s UT in Pu’er region (23.0°N, 101.1°E), Yunnan Province, China. The data from DEMETER satellite during the period from 23 May to 2 June, i.e., ten days before the earthquake and one day just on the day of earthquake occurrence, were analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1 888 km from the epicenter were selected to be studied. Seven anomalous events were found on the dataset of the seven orbits among the 29 ones. There existed synchronous perturbations on the variations of the spectrogram of the electric field and the variations of the density and temperature of the ions and electron, in contrast with the variations of its surround- ing area. And five events appeared in the space within 1 888 km from the epicenter while the other two were out of the studied area. Electrostatic turbulences were also recorded with the synchronous perturbations with that in the electron density and ions density in plasma in the region near the epicenter in the five events, which seems to sug- gest that there be some physical relation between these events and the preparation processes of Pu’er earthquake.A destructive Ms6.4 earthquake occurred on 2 June 2007 at 21.. 34. 56UT in Pu＇er region （23. 0°N, 101. 1°E ）, Yunnan Province, southwestern China. The data from DEMETER satellite during the period of May 23th to June 2nd, i. e. , 10 days before the earthquake and one day just on the day of earthquake occurrence, have been analyzed. Among the 284 orbits of DEMETER during the period, 29 orbits with the trace passing through the region within 1888 km from the epicenter, are selected for study. 7 anomalous events showing synchronous perturbations on the variation of the spectrogram of the electric field and the variation of the density and temperature of the ions and electron, in contrast with the variation in its surrounding area, are found on the dataset of the 7 orbits among the 29 ones. And 5 events appeared in the space above the range of the studied area, i. e. , within 1888 km from the epicenter, while the other 2 were far away from the studied area. The 5 events might be associated with the Pu＇er earthquake.

关 键 词：DEMETER 普洱地震 电离层前兆 

分 类 号：P315.7[天文地球—地震学]