Co-seismic Gravity Change of Mw 7.9 Wenchuan Earthquake and Pre-Seismic Gravity Anomaly Detection by Superconducting Gravimeter at Hsinchu, Taiwan, from April to June 2008

S. C. Lan, T. T. Yu, Chein-way Hwang, R. Kao

研究成果: Conference contribution同行評審

摘要

Earthquakes are caused by crustal movement that releases a huge amount of energy and leads to deformation. The gravity near the epicenter is changed by the deformation of rock materials. Precursors may be detected during the period of seismogenic activity. On 12 May, 2008, a M w 7.9 earthquake struck near Wenchuan in China. A co-seismic gravity offset of 10.5μGal and a pre-seismic gravity anomaly about 2 days before the main shock was found in gravity records of the superconducting gravimeter (SG) at Hsinchu, Taiwan. SG records from April to June 2008 were used in this study. During this period of time, 8 gravity anomaly events caused by earthquakes were found. Sonograms of time-frequency analysis show that the perturbations occurred in 1-2 major bands (0.1-0.15Hz and 0.2-0.3Hz). The results of canonical correlation analysis show a significant positive correlation between the duration of gravity perturbation before the main shock and the magnitude of the earthquake. This study suggest that SG is a promising instrument for the analysis of earthquake events.

原文English
主出版物標題VII Hotine-Marussi Symposium on Mathematical Geodesy - Proceedings of the Symposium
頁面355-360
頁數6
DOIs
出版狀態Published - 1 12月 2012
事件8th Hotine-Marussi Symposium on Mathematical Geodesy - Chania, Crete, Italy
持續時間: 6 7月 200910 7月 2009

出版系列

名字International Association of Geodesy Symposia
137
ISSN(列印)0939-9585

Conference

Conference8th Hotine-Marussi Symposium on Mathematical Geodesy
國家/地區Italy
城市Chania, Crete
期間6/07/0910/07/09

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