地震学报2013，Vol.35Issue(3)：390-399,10.DOI:10.3969/j.issn.0253-3782.2013.03.010
玉树地震前电离层VLF信号信噪比变化
The signal to noise ratio disturbance of ionospheric VLF radio signal before the 2010 Yushu Ms7.1 earthquake
摘要
Abstract
In Yushu,Qinghai province,a strong earthquake took place at 23:49:38 UT on April 13,2010,with a magnitude Ms7.1.Based on ICE experiments onboard the DEMETER satellite,the VLF signal in 10-20 kHz radiated by three ground transmitters and received on board of DEMETER satellite revealed the attenuation of the signal to noise ratio averaged value in the region with a radius of 500 km from the earthquake epicenter in a revisited period of DEMETER just prior to the mainshock.On the other hand,there were no similar phenomena in 2009; on the contrary we found an ascending SNR in the corresponding time interval and spatial position.These ionospheric anomalies before the Yushu earthquake are highly regarded as resulting from the seismoionospheric coupling.关键词
玉树地震/DEMETER卫星观测/VLF电场频谱/信噪比Key words
Yushu earthquake/ DEMETER satellite observations/ VLF electric field spectrum / signal to noise ratio分类
天文与地球科学引用本文复制引用
姚丽,陈化然,何宇飞..玉树地震前电离层VLF信号信噪比变化[J].地震学报,2013,35(3):390-399,10.基金项目
公益性行业科研专项"卫星VLF信噪比背景及地震异常特征研究"(201008007-04)和国家科技支撑项目(2012BAK19B02-03)资助. （201008007-04）
