Long-Trend Analysis of the Tidal Observation Based on EMD Method
详细信息
- 责任者：Lu Pinji (Institute of seismology ; CEA ; Wuhan 43007 ; China) ; Zhao Bin
- 刊名：Journal of Seismological Research
- 出版年：2011
- 卷期：34(4)
- 关键词：潮汐作用 ; tidal processes ; 地震预测 ; earthquake prediction
- 页码：p.453-456
- 图表：3 illus., 5 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
On Apr.14,2010,an MS7.1 earthquake occurred in Yushu,Qinghai.Using the Empirical Model Decomposition method,we analyzed the data of tilt earth tide and the data of strain earth tide from 6 stations(Yushu,Xiangcheng,Delingha,Huangyuan,Geermu,Ganzi)located within 600km from the Yushu earthquake’s epicenter,to extract the long-trend variations of tilt earth tide and strain earth tide.Some abnormalities were found before the Yushu earthquake on the tilt vector map and plane strain map.The curves of tilt vector at Yushu Station which was only 31 km away from the epicenter quickly twisted before the Yushu earthquake.The curves of plane strain at Geermu Station and Ganzi Station which were located at both ends of the Yushu-Ganzi Fault changed their directions six months before the earthquake.This may reflect the Fault Zone’s plane strain change before Yushu earthquake.