摘要
汶川大地震爆发后,作者在武汉大地测量国家野外科学观测站的重力仪资料中发现了震前约48小时的"重力扰动"现象、并在随后对全国数十个台站宽带地震仪资料的分析中得到了证实, 2009年3月19日,太平洋岛国汤加海域爆发了M_w7.6级(里氏7.9级)大地震,宽带地震仪资料中再次出现了显著的、信号周期为4-8秒的"震前扰动"现象:从大地震前约16天的3月4日开始一直持续到地震发生。
It has beenreported that we discovered significant gravity disturbance before the 2008 Wenchuan earthquake （ Ms = 8. 0） at the Wuhan national field scientific observational station for geodesy , and we confirmed our observation by broadband seismometers data from several tens station across the country. On 19 Mar, 2009 the Mw 7. 6 earthquake struck the South Pacific island country of Tonga. We found that the significant fore-seismic disturbance was also be observed by broadband seismometers. The disturbance signals started on 16 Mar, 16 days before the Tonga earthquake, with its period mainly in band of 4-8 s.
出处
《地球物理学进展》
CSCD
北大核心
2009年第3期866-870,共5页
Progress in Geophysics
基金
国家自然科学基金(40774011
40874014)
湖北省自然科学基金(2008CDB056)
质检公益性行业科研专项基金(数字化地震前兆地壳形变观测方法标准研究)10-215项目资助.
关键词
2009汤加大地震
宽带地震仪
震前扰动
2009 great Tonga earthquake, broadband seismometer, fore-seismic disturbance
